you will see on a clear night in
Constellation: The Big Dipper (part of the Great Bear)
Double Stars: Alcor & Mizar
Solar System: Jupiter, Saturn & The
Finally, we are enjoying spring weather. Snow has given
way to green grass, tulips, daffodils as well as budding trees and
bushes. In the sky, changes have taken place as well. ORION the hunter,
the largest and brightest winter constellation, has left us. Orion will
be replaced by the Summer Triangle in July-August.
What happened to Orion with its 3-star belt? Most
constellations relocate from east to west as the Earth rotates around
the Sun. Constellations such as Orion, which is well below the North
Star, disappear in the west late in the day. Orion will return next
Gone with Orion is SIRIUS, the brightest winter star.
Replacing it is ARCTURUS, the brightest spring-and-summer star. Here's
how you find Arcturus: First, locate the BIG DIPPER high overhead to
the north. Then draw an imaginary arc-shaped line beyond the handle of
the Big Dipper and you will see Arcturus.
That's why some astronomers exclaim, "Let's arc to
Arcturus." Continue your imaginary line to the right of Arcturus and
you will spot the star Spica.
The Big Dipper
The seven-star BIG DIPPER--the most well known star
configuration in the night sky--is a circumpolar grouping, which means
that we see it year-round because it is close to the North Star. The
Dipper is part of the constellation URSA MAJOR (Big Bear).
Locate the Dipper's bowl. If you draw an imaginary line
beyond the two end stars of the bowl, you will find THE NORTH STAR.
Many people think that the North Star is the brightest in the night
sky. Not true! It's way down on the brightness scale (close to no. 50
on the brightness scale). However, it is in the same spot every night
because it is above the Earth's axis.
The North Star is the lead star of the seven-star LITTLE
DIPPER, which pours into the bowl of The Big Dipper. But you have to be
at a very dark site-like a farm or a cottage away from city lights-to
be able to make out The Little Dipper.
There is something unique about one of the seven stars of
the Big Dipper. Look carefully at the second star from the end of the
Dipper's handle and you'll spot a double star, ALCOR & MIZAR. The
star duo is more definitive with binoculars or a telescope.
On May 1, JUPITER appeared high in the south as a large
“star,” --brighter than Arcturus. By late June it will be in the south-southeast.
Even though Jupiter looks like a star, it has a diameter 11 times than
of Earth. The giant of the solar system, Jupiter takes 12 years to orbit the
Sun--about the same time you've been on Earth! The fifth planet from
the Sun is a huge gas ball of helium and hydrogen so big that its
volume would contain 1,300 Earths.
video of Jupiter shows its moons in different positions.
Are you aware there are about 150 moons in the solar
of the powerful magnetic fields of the four gaseous planets (Jupiter,
Saturn, Uranus and Neptune), they have most of the moons. Since
Jupiter has 65 moons, some observers refer to the giant planet as a
mini solar system.
With binoculars, you may be able to make out Jupiter’s
moons—called Galilean moons after the early astronomer who
discovered them, Galileo. These four moons will pop out quite clearly
if you view them with a telescope. In addition, you will likely see
bands going across the planet; these are layers of gas.
Beginning in mid-June, SATURN will appear as a “star”
fairly close to the southeast horizon, somewhat dimmer than Jupiter.
you can’t see the planet because trees, homes or buildings are
obstructing your view, have your parents drive you to Wilmot Line, a
road that branches off Erb St., just past the Waterloo landfill. A good
place to park on Wilmot Line is on a hill 2.2 km from Erb St., near a
60 km/h road sign.
will need a telescope to find Saturn’s dramatic rings. Saturn
is the sixth planet from the Sun. Is there anyone in your family 30
years old? That’s how long it takes the ringed planet to orbit the
Sun. Although the gaseous planet appears tiny in a telescope, it is
the second largest planet in the solar system. It would take 10
Earths to span Saturn’s diameter and 20 Earths to span its rings.
The brightest object in the night sky--some astronomers
say the most rewarding--is the MOON. Between May 29 to June 9 and after June 26, the Moon will display its early evening phases:
- May 10 & June 9: full Moon
- May 29 & June 27: crescent Moon.
- May 2 & June 1: first quarter Moon.
The photo below shows the Moon between crescent and first
Craters and "seas" (the grey areas of the Moon) can be
easily picked out with binoculars or a low power telescope. The secret
to viewing the night sky with binoculars is to keep them as steady as
possible: either mount them on a tripod or sit back in a lawn chair
that has a tilted back.
Where to look for the Moon after sunset? The crescent
phase will appear in the west, the quarter phase in the south and the
full Moon in the east.
Did you know that the Moon's craters are the result of
our closest celestial object being pummelled and battered by giant
space rocks or asteroids? If the Moon had an atmosphere, the craters
would have long eroded away from wind and water erosion like what
happened here on Earth. But because there is no atmosphere on the Moon,
the craters have not changed ever since they were formed.
The Moon's craters and mountains are most dramatic if you
look near the terminator, the line that separates the dark side from
the sunlit side. That's because the shadows created by the Sun are the
longest. If you look through a telescope, you can even spot crater
walls disappearing into the shadows.