Observing Exercise – Spring 2012 Open Cluster Observing Date and Time are set for 9 pm April 20 but we can use this for 10 pm Mid-March so you can do this.

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Observing Exercise – Spring 2012 Open Cluster Observing Date and Time are set for 9 pm April 20 but we can use this for 10 pm Mid-March so you can do this exercise earlier. Looking due South: Meridian shows the great divide between galaxies (pink ellipses) on the East side of the meridian and Open (Galactic) clusters on the West

First: Clusters towards the West Open Clusters in Auriga Date and Time are set for 9pm April 20 We will focus on the Western part of the sky to observe some Open Clusters– gems of the early evening spring sky First stop: Open Clusters in Auriga: M37, M38, M36: Locate the Bright Star Capella in the pentagon of Auriga. Point your telescope or binoculars to the East of the flanking side to pick up M37. Continue sweeping westward to pickup up M36 and M37 Compare and contrast… Which is the richest star field? Are they all at the same distance? Do they contain the same kinds of stars? Capella

Canis Major, Minor and Monoceros M41, M46 and M47 Locate brightest star Sirius (the dog star) Locate brightest star Sirius (Canis Major - underneath Orion) Note: reason for its brightness is both its intrinsic luminosity and closeness to the Sun Slide your scope or binoculars parallel to the dog’s back and then move west of that line. You will pick up a large rich field of stars – Open Cluster M41 Procyon (Canis Minor) Locate next large and (also close) Procyon This points the way to 2 very different open clusters in Monocerous, M47 (bright!) and M46 dim Compare and contrast…

The Beehive! Open Cluster M44 (and neighbour M67) Open Cluster M44 is observable with the eye in an unpolluted sky. In this view it Is due south, leading constellation Leo. To find it point your telescope or binoculars midway between the heads of Leo and the Gemini twins You will see the swarm of ‘bees’ (many suns) underneath. Then drop down parallel to Regulus and look for the very dimmer M67. You need optical aid here! If you have problems finding it, locate the “head” of Hydra, you can see the pair naked eye and go up from the right one. Compare and contrast …

u 1.Locate Constellation Cassiopeia. It’s the W in the NorthEast 2.Locate the wish-bone (y- shape) of Constellation Perseus 3.The Double Cluster NGC 869/864 is in- betwwen the top of the wish-bone and the top star of Cassiopeia Observe the Double Cluster NGC 869/864