Transcript observingglobularclusters

Observing Exercise
Globular Cluster Observing
M92
This view is West horizon if
mid-August or can be used for South
horizon if late May . (Ignore the
meridian as shown in that case).
M13
Globular Clusters:
Constellation Globular Cluster
------------------ ----------------------Canes Venetici M3
Coma Berenices M53
M3
Hercules
Great Globular M13
Under-appreciated M92
M53
Globular Clusters M3 and M53 (Spring Astronomy)
1.Locate the Bright StarArcturus
(Hint, Follow the Arc to Arcturus).
2. Locate Alpha Canis Venetici
3. M3 is approx 1/3 of the way
on that line, just a little off to the
right.
asod sketch: http://www.asod.info/?p=311
Beautiful stellar city! (old city!)
====================
Next stop: Fainter Globular
Cluster M53:
2. Follow the line to the next
bright star to the West, called
Muphrid.
3. Now locate Alpha Coma
Berenices, the bottom of the
right triangle
M53 is above and to the left of
Alpha Coma Berenices. Nudge
the scope up and eastward to
find it.
The pair of stars in the wide field
help you confirm you have
found it.
sketch asod: http://www.asod.info/?p=1793
Arcturus
M3
M53
The Great and the Humble
Hercules Globular Clusters
M13 and m92
M92
Great Globular Cluster M13
Find the Keystone of Hercules:
Look at the top of the keystone
and drop down from the top right
(west) side about 1/3 the
distance.
1 million stars! “A glittering ball”
http://www.asod.info/?p=6594
Compare and contrast…
Globular cluster M92
From the top of the keystone,
draw an equilateral triangle.
M92 is slightly to the left of the
apex. Try and focus on the cluster
to resolve individual stars
Twice the distance of M13 (35,000
ly).
M13