NGC 2259 (Lund 244, Cr 108) Open Cluster in Monoceros

Located at: RA 06 hours 38 minutes 33 seconds, Dec +10 degrees 52 minutes 59 seconds

Size: 4.5' (3.5') Magnitude: 10.8 Class: II 1 p n

North is up

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

  ST-8XME, self-guided, binned 1x1, temp -15 & -25c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 390 minutes (39 x 10 minute subs), 02/3/10/2009; seeing 2.4-3.8 FWHM per CCDStack

Processing:

CCDStack 1.5.1, Photoshop 7.0

Location:

 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)

Notes: NGC 2259 is on the northern edge of the large nebulous complex Sh2-273 (LBN 991) in Monoceros. Sh2-273 is approximately 140' in size and contains many deep sky objects such as NGC 2264 (the "Christmas Tree Cluster") and the Dark Nebula known as the 'Cone". See this wonderful color presentation of the entire Sh2-273 complex by Davide De Martin.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 3.5 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 2259
NGC 2259 = Cr 108 = Mel 48
06 38 33.3 +10 52 57
Size 5

17.5": fairly faint, small, 3'-4' diameter, rich, irregularly round.  Consists 
of about 15 faint stars mag 13.5-14.5 sparkling over a layer of background haze.  
A double star mag 12/13 at 7" separation is at the N edge.  Mag 8.7 SAO 95930 is 
5' W and is surrounded by a less compressed group of 15-20 stars mag 12/13 in a 
6' triangular shape.  This mag 8.7 star has two faint companions on the S side 
and another close faint double star is 3' NE.

- by Steve Gottlieb