February 1 -
3 |
February 4 -10 |
February 11 - 17
| February
18 - 24 | February
25 - 28
NOTE: Times given in the scripts are all local Schenectady,
New York time.
Friday, February 1st to Sunday, February
3rd. Written by George Mileski
A comet may appear anywhere in the sky at any time, looking like a
fuzzy star, perhaps even with a tail. These are the nomads of our
solar system. Traveling in highly ellipical orbits, these frozen
chunks of dirty ice arrive from beyond the orbit of Neptune. This
dirty ice is composed of water, ammonia, methane, carbon dioxide and
other substances. As the comet goes past our sun, the surface of the
comet goes from a solid to a vapor, and the gases and dust released
on its surface create the comets coma or head. Radiation pressure
from the sun and the solar wind combine to press against the coma's
gas and dust to form the comet's tail. The comet Hyakutake in 1996
had an exceptionally long tail.
About a dozen or so comets are discovered each year, of this about
half are found by amateur astronomers. Some comets are big enough to
create two tails, an ion tail and a dust tail. Comet Hale-Bopp in
1997 was one of these. It was along with comet Hyakutake in 1996 and
Hale-Bopp in 1997 a spectacular sight to see. You might see one great
comet once in 10 years, we were fortunate to see two of them 2 years
in a row and that's pretty amazing. At the present time we seem to be
shy on comets. The sky after twilight has three planets to look at
and a few other things too. In the west we have the red planet Mars,
it will set shortly after 10:00 PM, it stands about 30 degrees from
the western horizon. Its in the constellation Pisces. Jupiter and
Saturn are high overhead and are about 29 degrees apart. Jupiter is
in the constellation Gemini and Saturn is in Taurus the bull. When
you see Leo the lion coming over the eastern horizon you can be sure
that's a sign of spring.
**********************************************
Monday, February 4th. Written by Joseph
Slomka.
The Sun sets tonight at 5:12 PM, with the night falling at 6:49.
Dawn breaks at 5:30 tomorrow morning, and ends with sunrise at 7:05
AM.
At Sunset, three planets occupy our attention. Mars still glows in
the southwest. At first magnitude, it is easy to spot, but too small
for observation by telescope or binoculars. Jupiter and Saturn occupy
the East. Both are fairly bright, but it is better to wait until
night-fall, when they are higher. Jupiter appears in the
constellation Gemini, around Castor's ankle. If you have a telescope,
now is a good time to view Jupiter. Recent observations show changes
to its atmosphere. Can you spot them? Saturn remains directly above
the Bull's Eye, the star Aldebaran, in the constellation Taurus.
Saturn's image very rarely changes; its rings swing from near
invisible to facing us - the position they now display.
The planet Mercury begins a springtime showing this week. By
sunrise, the planet is about ten degrees above the horizon. It will
not be easy to see Mercury, since any obstruction may block the
eastern horizon. As the month progresses, the chances of observing
this elusive planet improve.
The largest and easiest identified constellation, the giant
warrior Orion, is already well risen by nightfall. Naked eye
observation is rewarded by glorious sight of the three belt stars,
with the fuzzy sword directly below. Binocular views of that area
show it as a swirling mass of clouds, which astronomers now know to
be the birthplace new stars.
Immediately beneath Orion's feet is seen the constellation Lepus,
the Hare. The origin and placement of this constellation is a bit of
a mystery. Some experts claim that Orion is hunting it because of the
great damage rabbits do to farmer's crops. Other scholars claim that
both Orion and Lepus are fleeing foes half the sky away. In the
summer, Orion sets as his adversary, Scorpius rises. Likewise, Lepus
ducks below the horizon as Aquila, the Eagle, appears. Whichever
legend is true, the constellation is worth observing, especially for
the star cluster, M79, beneath it.
**********************************************
Tuesday, February 5th. Written by Jonathan
Cassidy.
The brightest stars of the year are seen in the winter. The winter
ring of stars now circling Jupiter include six of the 17 brightest
stars found at this latitude in any season. The brightest star in the
winter sky is Sirius, in Canis Major. Sirius is bright because it is
rather close, 8.6 light years (ly) away. If all the stars in the
night sky were the same distance, absolute magnitude measurements use
10 parsecs or about 32.6 ly, then we would see that Sirius is not so
bright.
Several of other stars in the constellation Sirius Major are small
to our eyes, but if they were all put at the same distance the small
ones would seem mighty bright. Some of these visually small stars put
out 50,000 times the brightness of our own Sun. It is only due to
their great distance that the seem so dim.
Thus the stars that make up a constellation are in a group only by
chance. Most are not associated, with some being close and some being
very far away. The constellation patterns have been made up over many
millennia and hold together because the stars seem to move little in
relation to each other time that seems to us to be very long.
**********************************************
Wednesday, February 6th. Written by Ray Bogucki.
Early on Friday morning, both Mercury and Saturn, the innermost
and outermost of the five bright planets, will stand stationary
against the background of "fixed" stars. This event is not especially
notable except for its unusual coincidence. The earliest astronomers
were well aware of these five bright, star-like objects whose
restless movements among the stars provided one of the greatest
puzzles in astronomy for over a thousand years. The Greek word
"planet" means "wanderer", but there are times when, for a short
period, these wanderers stop and stand motionless against the starry
background. The modern explanation of planetary motion was proposed
by the Polish astronomer, Nicholas Copernicus when, shortly before
his death in 1543, he published his famous treatise on the revolution
of the planets. This book upset the common belief that the Earth was
stationary and all the celestial objects revolved around the Earth.
In one inspired stroke he explained why the two inner planets,
Mercury and Venus, appear to swing west and then east of the Sun,
becoming alternately morning and evening stars. His model also
explains why the three bright outer planets normally move slowly
through the stars in an easterly direction along the ecliptic, but
once each Earth-year, they stop, reverse their direction in a
retrograde motion as the Earth passes between them and the Sun, then
become stationary again before resuming their normal easterly
paths.
With its short, 88-day orbital period, Mercury overtakes and
passes the Earth several times each Earth-year, like a faster race
car on an inside track. As Mercury, the evening star swings back
toward the Sun, it reaches a point in its orbit where it is
approaching directly toward the Earth. At this point it will appear
to be stationary. After passing between the Earth and the Sun, it
reaches a point in its orbit as a morning star, when it is receding
directly away from the Earth, again making it appear stationary.
Because Saturn's orbit is much larger than Earth's, Saturn's
orbital motion can never carry it directly towards or away from the
Earth, but Earth, now being the faster planet on the inside track,
will move directly toward or away from Saturn once each Earth-year.
The reason for Friday's coincidence is that just at the moment
Mercury is receding directly away from us, we are moving directly
away from Saturn, so that both planets appear motionless. And, of
course, to observers on both Mercury and Saturn, the Earth would
appear stationary for a short period on Friday.
**********************************************
Thursday, February 7th. Written by Peter Jennes.
Sunset for tonight, Thursday, February 7th was at 5:17. The moon
is about one week away from new and will not interfere with deep sky
observing. As the sky gets dark, first magnitude Mars will be glowing
somewhat dimly against the fading twilight 30 degrees above the
southwestern horizon. Once the sky is completely dark, deep-sky
objects will be ready for observing.
Around 9 PM, Orion will be high in the south. The brightest stars
of Orion are Betelgeuse and Rigel. Rigel marks the upper left corner
of Orion while Betelgeuse marks the lower right corner of this
celestial giant. If you draw a line from Rigel through Betelgeuse, it
will point to the constellation Gemini.
The brightest stars of Gemini are Castor and Pollux. About half
way between the upper left of Orion and the twin stars of Gemini,
lies an open star cluster, M-35. This cluster is readily visible in
binoculars and contains about 200 stars. Look about one hand width
above the line joining the stars of Orion and Gemini. There you will
find fifth magnitude M-35 occupying an area of sky about the size of
the full moon.
If you extend a line through Castor and Pollux off to the east,
you will cross a region of the sky that has few bright stars. About
three hand widths along this line and one hand width above it,
binocular observers should be able to find another open cluster. This
cluster is called the Beehive Cluster or M-44. Under a dark sky, the
Beehive is just visible to the unaided eye as a misty patch of light.
Because M-44 is only 525 light years away, the Beehive looks quite
large for an open cluster. In a small telescope, you can easily see
60 stars spanning 1.5 degrees of sky.
**********************************************
Friday, February 8th to Sunday, February 10th. Written by
George Mileski
When you step outside tonight take a look at the bright stars of
winter. One thing I like, assuming its a crystal clear night is to
look at the winter hexagon. Its a circle of 7 bright stars. The stars
are Aldebaren, Capella, Castor, Pollux, Procyon, Sirius and Rigel.
This year joining in and around the group is Jupiter and Saturn.
Tracing out the circle you will find it is a little bit lopsided. Of
the six stars, Sirius is the brightest. It is bright because it is
less than 9 light years away from earth. It is also the brightest
star in the sky. It has an apparent magnitude of -1.4. The surface
temperature of Sirius is about 10,000 degrees centigrade compared to
the sun's temperature of 6,000. Sirius is in the Constellation
Orion.
The star Capella is in the Constellation Auriga, the Charioteer.
The figure in the sky does not look like what its suppose to
represent, the Charioteer. It looks like a pentagon instead. Capella
is a yellow star and is the most northerly of the first-magnitude
stars. It is actually a binary or double star system. Capella means
"she-goat" and the three stars in a triangle just to the southwest
are known as the kids. Capella is about 45 light years away. Using a
telescope there are three open star clusters M-36, M-37, and M-38.
Procyon in Canis Major, also called "the small dog" is a double star,
its partner is an 11th magnitude white dwarf 4 arc-seconds away.
Northwest of Procyon is Gomeisa the other bright star in the
constellation. If you get up about 30 minutes before sunrise on
Sunday, you should be able to see the planet Mercury and below it
will be the old crescent moon, you will need binoculars.
**********************************************
Monday, February 11th. Written by Joseph
Slomka.
The Sun sets tonight at 5:22, while night falls at 6:57 PM. The
Moon is at the "new" phase tonight, and is not seen at all. Dawn
breaks at 5:22 AM and ends with sunrise at 6:57.
As the sky darkens, three planets are visible. Mars is found
glowing dimly in the southwest. Jupiter and Saturn are brighter in
southeastern skies. Jupiter is parked in Gemini's ankle, while creamy
white Saturn shines above the red star Aldebaran in Taurus.
Mercury is the only planet found in dawn skies. By sunrise, it is
about eleven and a half degrees above the horizon, so a flat,
eastern, horizon is necessary to find this elusive planet.
High in the eastern sky about 9:00 PM are the Pleiades. This
unique group of stars is a distinctive mini-dipper shape. While most
people see six or seven stars, eleven can be seen under excellent
conditions. This group contains about 250 members. The Japanese call
it Subaru, and made it the corporate symbol of an automobile company.
The Pleiades average second magnitude in brightness, and are best
enjoyed in binoculars or low power telescope, since the group is
about one degree in size. They are a true group, traveling together
in the general direction of Orion. The Pleiades are about 410 light
years away, and are relatively young. The brightest, is about ten
times larger than our Sun, but 1000 times brighter. There is some
evidence that Alcyone is the "lost Pleiad" since it has periodically
brightened and dimmed.
AS the sky dims, a most unusual sight confronts the observer. As
we know, the entire sky seems to revolve about the North Star, an
illusion caused by the Earth's rotation. As a result, some
constellations are setting while others are rising. Constellations
are formed when people found familiar patterns of stars. "The Big
Dipper," forms the brightest portion of Ursa Major, the Large Bear.
Tonight, the dipper's pot rises, on its handle! It is quite a sight
to see a pot standing upright on its handle.
**********************************************
Tuesday, February 12th. Written by Jonathan
Cassidy.
Tonight we see a line up of planets that show us where our solar
system lies. Look out this week and see setting Mars in the west, up
from Mars see Saturn still lingering near Aldebaran, last see bright
Jupiter. The line these planets make up is the ecliptic, the path our
Sun follows. This is the plane of our solar system.
Our solar system resides in the Milky Way Glx. We are without the
Moon tonight as it is new. Thus, from a dark sky place we can see the
faint hazy plane of the Northern Milky Way Glx. Notice that the plane
of the Milky Way and the plane of the solar system do not match.
We can grasp from looking out at these two planes that we are
traveling in two different circles. One the circle of our orbit
around the Sun in the plane of our solar system. The other our trip,
with all our solar system neighbors, around the center of our galaxy
along the plane of the Milky Way.
In addition to these two planes our solar system is traveling
through the Milky Way from the top to the bottom of a spiral arm.
With all this you can expect that our view of the night sky will
change and indeed it does continually, however the distances are so
vast that the change is very slow in human time.
**********************************************
Wednesday, February 13th. Written by Ray
Bogucki.
Yesterday marked a significant anniversary in our study of the
solar system. 41 years ago, less than 3-1/2 years after they opened
the Space Age with Sputnik I, the Soviets began the age of
interplanetary exploration by launching the space-craft Venera I,
aimed at Venus. Radio contact was lost early in the mission, but the
following year, in 1962, the U.S. successfully launched Mariner 2,
which flew past Venus at a distance of only 20,000 miles. Along the
way it transmitted information about the solar wind, interplanetary
dust, high energy, charged particles from solar flares and cosmic
rays from outside the solar system.
From these simple beginnings, the past four decades have seen the
development of elegant instruments and ingenious interplanetary
navigational techniques that are simply mind-bending. We can here
note only a few of the hundreds of missions that have been launched.
The Hubble Space Telescope and the Chandra gamma-ray laboratory, both
orbiting the Earth above its troublesome atmosphere, have
revolutionized our understanding of the cosmos with their incredibly
sharply defined images. Astronauts have walked on the Moon and
brought back samples of its surface material. Unmanned probes have
landed on, and returned information from; Mars, Venus, Jupiter and
even the asteroid, Eros.
Human accomplishments must be measured against the background of
their times, and when, in 1610, Galileo turned his primitive
telescope to Jupiter and became the first person to see the four
little points of light moving around it, his conclusion that they
were moons orbiting Jupiter was as great a leap in understanding as
any that have been made since. Still, in his wildest dreams, Galileo
could not have imagined that less than 400 years later, a spacecraft
bearing his name would send faint radio signals back to Earth across
a half-billion miles to be resolved by computers into exquisitely
detailed images of those same four moons, showing, for example,
volcanoes erupting on Io (EYE-oh) and the cracked, icy surface of
Europa.
**********************************************
Thursday, February 14th. Written by Peter
Jennes.
About the time the Moon sets, Orion will be at its highest in the
south. In Greek mythology, the Moon and Orion were linked together.
The ancient Greeks embodied the goddess Artemis in the Moon. This
prominent place was appropriate since Artemis was the twin sister of
Apollo the Sun god. When Artemis was young, her father, the chief god
Zeus, asked Artemis what gifts she would like. One of Artemisí
requests was for a bow and arrow. This wish was granted and as
Artemis grew up, she became a huntress of unequaled skill.
According to legend, Orion was also a great and handsome hunter.
This appealed to Artemis and enraged her brother Apollo who became
determined to end to their love. Towards that end, Apollo sent an
enormous scorpion to attack Orion. Orion fought valiantly but was no
match for the enchanted scorpion. Orion did the only thing he could
do and escaped by swimming out to sea. Just after Orion made his
escape, Artemis came upon her brother who was watching Orion swim out
to sea.
Apollo convinced his sister that the distant swimmer was a
stranger who had insulted one of Artemis' priestesses. This angered
Artemis and she took aim with her bow and shot the figure dead.
Realizing the dreadful mistake she made, Artemis elevated Orion to
the heavens where she could gaze upon him as she drove her Moon
chariot across the sky. Then, to remind all mortals of her
brotherís jealousy, she flung the scorpion onto the opposite
side of the sky. From this location, Scorpius the scorpion might
pursue Orion, but would never harm Orion again.
The stars marking the four corners of Orion's familiar hourglass
shape are Rigel at the lower right, Belatrix at the upper right,
Betelgeuse at the upper left, and Saiph at the lower left corner.
Slicing through the middle of the hourglass are three relatively
bright stars that form Orion's belt. Mintaka is the upper right star
of the belt, Alnilam is the center star, and Alnitak on the lower
left belt star. If the sky is dark and clear, you may notice a fuzzy
patch just below Alnitak. Even simple binoculars will reveal this
patch to be the stellar nursery of the Great Orion Nebula.
**********************************************
Friday, February 15th to Sunday, February 17th. Written by
George Mileski
When you step outside on a clear winter night, the sky is ablaze
with many bright stars and several planets. Its easy to overlook one
of the winter sky's lovelier sights. You might even notice it as a
hazy patch among the stars. What your looking at is the beehive
cluster. Its in the Constellation Cancer. It is nothing less than a
cluster of hundreds of stars, whose light which covers an area twice
that of a full moon. Its over 500 light years away. Its a pretty
sight to look at with binoculars or a Rich-Field telescope. The
beehive is an open star cluster, another name for it is Praesepe. It
was born from a single cloud of interstellar gas and dust, and the
stars in it are bound together by gravity.
Ultimately clusters of this sort dissolve and the member stars
drift away to pursue their own orbits around the center of the Milky
Way Galaxy. The beehive lies nearly at the center of Cancer, one of
the Constellations of the zodiac. Cancer represents a crab, that was
supposedly raised into the heavens after being squashed by Hercules
during a battle. The Tropic of Cancer, the latitude where the sun
appears directly overhead on the summer solstice is named for this
Constellation. Several thousand years ago when the ancients coined
the name, the sun resided in Cancer on the first day of summer.
Cancer is one constellation that just doesn't jump out at you, its
stars are quite dim and hard to see. One way I find it is to locate
Regulus, in Leo the Lion and Pollux, in Gemini, and in the distance
between the two you will find Cancer. Cancer appears in the sky as an
upside down Y. The beehive cluster lies about in the middle of the Y
of the Constellation.
On Saturday the 16th, the waxing crescent moon will be 5 degrees
at the lower left of Mars. Venus is finally visible, setting in the
west. You should be able to see it, 15 minutes after the sun sets.
You can't wait to long because Venus sets around 6:00.
**********************************************
Monday, February 18th. Written by Joseph
Slomka.
No Script
HOLIDAY
**********************************************
Tuesday, February 19th. Written by Jonathan Cassid
y.
WARNING! WARNING! There is, so it seems an imminent crash!!!!!
Our Moon is taking dead aim at Saturn!!!
On Tuesday night the Moon will slide just below the Pleiades, a
small prominent cluster stars just past the zenith of the sky. This
night watch as the Moon draws closer and closer to the planet
Saturn.
Watch on Wednesday night, tomorrow, as the Moon slides in front of
Saturn. This is called an occultation, the hiding of one body by
another. In ancient days there was great puzzlement about
occultation, one common belief held that all celestial objects
occupied one plane of a dome over the Earth. But occultation was
observed to happen back then as it will tomorrow and when it did it
caused difficulties for the concept of astronomy of the time.
We know that space is three dimensional, but back 2,000 + years
ago there was no way to know that EXCEPT that on occasion one body
would seem to bump into another and yet neither was not disturbed
after the event.
Watch the Moon during early and late crescent stages, when it is
not so bright. This is seen in shortly after sunset or before
sunrise. See for yourself how it comes close to or occults many
objects in the night sky.
**********************************************
Wednesday, February 20th. Written by Michael
Molitor.
The evening of Wednesday February 20, the Moon will occult the
planet Saturn. Occult means that the Moon will move in front of the
planet Saturn. This situation is somewhat like an eclipse of the Sun,
where the Moon moves in front of the Sun. Saturn is bright, so even
if it is hazy or if there are thin clouds, the occultation should
still be visible. The Moon is slightly more than half illuminated,
and the dark half, or dark limb of the Moon, will be the edge that
will be the first to cover Saturn. You can use your eyes, or you can
use binoculars, or you can use a telescope. It should be interesting
to watch any way you choose.
Start by getting out ten or fifteen minutes early and locating the
Moon and the bright "star" near it. That "star" will be the planet
Saturn. If using only your eyes, or binoculars, the "star" (Saturn)
will slowly grow dimmer over a couple of minutes, before
disappearing. If using a telescope, you should be able to see that
Saturn is not a star, but a tiny distinct disk, with a ring around
it. Beginning at 7:27 pm or so, in Albany, you will be able to see
the moon gradually cover Saturn and its rings, over a two minute
period.
The planet will reappear on the other edge of the Moon (the bright
limb) about 70 minutes later. The reappearance will be much harder to
view because it is difficult to anticipate precisely when and where
Saturn will reappear. A good Moon map, and an accurate clock will
help. Also, Saturn will be appearing on the bright limb, so it is
masked by the brightness of the Moon itself. It will not be easy, but
it may be possible to observe Saturns reappearance using
binoculars, or by eye. Using a small telescope will provide a better
chance. The dividing line between dark and light halves of the Moon
is known as the Lunar terminator. Using the terminator as the
12-o'clock to 6-o'clock line, Saturn should reappear near the
2-o'clock position, around 8:38pm.
This event is a good way to get a true feel for how fast the Moon
is moving in orbit around the Earth. Normally, one doesn't perceive
that the Moon is moving at all. But, it is. The occultation of Saturn
is a graphic demonstration of that fact. So, if it is clear and you
can see the Moon, this is a fun event to observe.
**********************************************
Thursday, February 21st. Written by Peter
Jennes.
**********************************************
Friday, February 22nd to Sunday, February 24th. Written by
George Mileski
**********************************************
Monday, February 25th. Written by Joseph
Slomka.
The Sun sets at 5:40, with night falling at 7:14 PM. Dawn breaks
at 5:02 tomorrow morning, with sunrise taking place at 6:36.
The evening sky changed little in the last month. Mars is still in
the southwest, while Jupiter and Saturn ride high in the southeast.
Jupiter is still the brightest planet, a binocular object in Gemini.
Saturn keeps station above the red star Aldebaran in Taurus, though
telescopes are required to see its rings.
Adventurous souls can rise before the Sun and try to spot
difficult planet Mercury in the southeast. It already reached maximum
elevation last week and is on its way down, but a clear horizon and
binoculars could provide rewarding views.
If you have a clear southwestern horizon, use your binoculars to
spot a comet. It is about eleven degrees above the horizon in the
southwest, below Mars. Try looking for it between sunset and
nightfall. At the beginning of the month, a new comet was spotted.
Kaoru Ikeya in Japan and Daqing Zhang in China saw the same object at
the same time. It is hoped that comet Ikeya-Zhang may become a
beautiful spring comet. Already it is slightly brighter than first
estimates. The comet may become difficult in March evening skies, but
better after perihelion in April when it returns to visibility. If
the name Ikeya sounds familiar, he is a famous comet hunter; his most
famous comet was visible to the naked eye in 1965.
Three years ago this Skywatch Line was buzzing with news of comet
Hale-Bopp. Comets are, "dirty snowballs." They are considered
remnants of solar system formation, basically loosely knit mounds of
rock and snow. As the comet approaches the Sun, the ices sublimate
and form a tail of ice crystals and gas, which the Sun illuminates.
The comet grows brighter as it nears the Sun and the tail grows
longer. The Solar Wind, particles that the Sun spews out, pushes the
tail away from the Sun.
**********************************************
Tuesday, February 26th. Written by Jonathan
Cassidy.
Full moon tonight. Not much to see in the sky. The extra light
also makes it difficult to see anything but the Moon and the very
brightest objects. Notice tonight far to the right of the Moon the
planets Jupiter, nearest, and Saturn, near the bright star Aldebaran.
You will also see Betelgeuse, south of Jupiter, and Sirius, south of
Betelgeuse.
Very near the Moon, just to the right is a lone star. This is
Regulus in the constellation Leo the Lion. When the Moon is not in
this area Leo can be found by noting the asterism of a backward
question mark. This defines the lion's head, mane and chest with the
biright star Regulus holding the position of the lion's heart.
The time of the full Moon is a good time for the beginning
astronomer to note the position and alignment of key stars as they
are the only ones that can be seen other than the Moon. You will not
be distracted by thousands of stars. No matter where you live, city
or country, you will see the Moon and only the few bright key star
that help us to find our way around the sky. Note these stars and
during the next new Moon try to find again the brightest ones that
were visible when the Moon was full.
Find Regulus tonight near the full Moon and try again in a week to
see the rest of the lion.
**********************************************
Wednesday, February 27th. Written by Ray
Bogucki.
**********************************************
Thursday, February 28th. Written by Peter
Jennes.
Around 9 PM, the familiar shape of Orion will be high in the
south. The brightest stars of Orion are Betelgeuse and Rigel. These
two stars mark the upper left and lower right corner of Orion's
hourglass shape. If you draw a line from the lower right through the
three belt stars and then through the upper left star, the line
formed will point to the constellation Gemini.
The two brightest stars of Gemini are Castor and Pollux. About
half way between the upper left star of Orion and the twin stars of
Gemini you can easily spot the brilliant light of Jupiter. To the
west of Jupiter lies a small curve of third magnitude stars that
marks the foot of Castor. At the end of this curve, binoculars reveal
an open cluster of stars known as M-35. This cluster contains about
100 stars that occupy an area of the sky about the size of the full
moon. The combined light from all the stars in this cluster is the
same as that of a single, fifth magnitude star.
Although M-35 is one of the most well known open clusters in this
region of the sky, this beautiful cluster has several equally
impressive neighbors worth looking for. NGC 2158 appears to be a
small cluster adjacent to M-35. In reality, NGC 2158 lies about
13,000 light years away compared to 2,000 light years for M-35. At
that distance, NGC 2158 is one of the most distant open clusters
visible in a small telescope. The light of NGC 2158 is equivalent to
a ninth magnitude star spread out over a circle five arc-minutes in
diameter.
Further south of NGC 2158 lies IC 2157 and NGC 2129. IC 2157 is a
faint ninth magnitude cluster of fifteen stars inside an eight
arc-minute diameter circle. IC 2157 is only one degree away from M-35
but may be hard to spot from suburban locations. Moving further
south, NGC 2157 lies two degrees away from M-35. At seventh magnitude
and a diameter of seven arc-minutes, NGC 2129 is just visible in
binoculars. Telescopes show two eighth magnitude stars with fifteen
dimmer stars clustered around the brighter pair.