Hemisphere:  Southern  ·  Constellation: Canis Major (CMa)  ·  Contains:  NGC 2362  ·  The star 29CMa  ·  The star τCMa
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Caldwell C64 - NGC2362 Tau Canis Majoris Cluster, 


            Geoff Scott
Caldwell C64 - NGC2362 Tau Canis Majoris Cluster
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Caldwell C64 - NGC2362 Tau Canis Majoris Cluster

Technical card

Imaging telescopes or lenses: Bintel (GSO) BT200 8" f/4 Imaging Newtonian

Imaging cameras: Canon EOS 40D

Mounts: NEQ6 Pro

Guiding telescopes or lenses: Orion USA ShortTube 80

Guiding cameras: Starlight Xpress Superstar

Focal reducers: MPCC

Software: Binary Rivers Backyard EOS  ·  PHD Guiding  ·  Luc Coiffier Deep Sky Stacker 3.3.3 beta 51  ·  Imaginova Starry Night Pro  ·  Photoshop CS5  ·  EQMod EQASCOM


Accessory: Skywatcher Electric Focuser

Dates:Oct. 27, 2013

Frames:HUTECH IDAS LPS P2: 16x60" (16') ISO800

Integration: 16'

Darks: 50

Bias: 75

Avg. Moon age: 22.61 days

Avg. Moon phase: 45.09%

Bortle Dark-Sky Scale: 7.00

Temperature: 17.00

Basic astrometry details

Astrometry.net job: 116704

RA center: 7h 18' 41"

DEC center: -24° 45' 50"

Pixel scale: 1.447 arcsec/pixel

Orientation: 49.650 degrees

Field radius: 0.548 degrees

Resolution: 620x482

Locations: Willetton, Willetton, Western Australia, Australia


Hidden away in the constellation of the Great Dog is this compact cluster of ~60 stars, dominated by one of the largest blue giant stars known, Tau Canis Majoris, with a mass 40-50 times our sun and 50,000 times the luminosity. Luckily the group is 5,000 light years from us and not where our sun is! Visually its brightness contrast with the rest of the group makes it appear to jump around, and it has the common name the 'Mexican Jumping Star'.

I've framed this so that 29W Canis Majoris is at the bottom left third. Whilst visually of similar brightness it is much closer and a much less remarkable star.


Sky plot

Sky plot


Caldwell C64 - NGC2362 Tau Canis Majoris Cluster, 


            Geoff Scott