Messier 93

Observation Notes:

This is a triangular arrow shaped cluster with its tip pointing southwest. This southwest tip hosts one orange and one yellow star. In the center lies a trapezium-like arrangement of stars. The main body appears to be 16′ in diameter. The brightest neighboring star lies 30′ to the southeast.


M93 lies 3600 light years away and its 80 or so member stars span 20-25 light years across. Its brightest stars are B9 Blue Giants, and its age is estimated at 100 million years. While its stars form a triangular shape, Kenneth Glyn Jones found it to look like a butterfly, while Admiral Smyth found it more like a starfish. It was one of the last deep sky objects discovered by Charles Messier personally and was cataloged in 1781.

Subject M93 (NGC 2447)
Classification Open Cluster
Position* Puppis [RA: 07:44.6 / Dec: -23:52
Size* 22′
Brightness* 6.0
Date/Time February 4, 2005 – 9:15 PM
(February 5, 2005 – 04:15 UT)
Observing Loc. Flagstaff, AZ – Home
Instrument Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L)
Eyepieces/Mag. 32 mm (37X)
Conditions Clear, 29°F
Seeing 2/10
Transparency Mag 5.0
Sources SEDS

*Based on published data.