Open Cluster M38 (NGC 1912), type 'e', in Auriga

RA 05 : 28.4 (h:m); Declination +35 : 50 (deg:m); Distance 4200 light years;
Visual Brightness 7.4 (mag); Apparent Dimension 21.0 (arc min)

Its brightest stars form a pattern resembling the Greek letter Pi, or (according to Webb) an "oblique cross". At its distance of 4,200 light years, its angular diameter of about 20' corresponds to about 25 light years, similar to that of its more distant neighbor M37.

Source and more: SEDS


February 8, 2008 18:21- 18:47 UT.
Imaging: William Optics Zenithstar 80 ED II APO F/6.8 [focal length 545 mm], ATK16IC camera, Astronomik LRGB filters.
Exposures: L 10x90s [1x1]; RGB 5x30 [2x2]; all unguided.

November 18, 2007 00:44 - 00:55 UT.
Three open clusters in one image.
Imaging: William Optics Zenithstar 80 ED II APO with Meade 3.3 Focal Reducer at f/3 [focal length 240 mm], ATK16IC camera, Astronomik LRGB filters.
Exposures: L: 13x20s; RGB: 5x12s each; autoguided.

March 13, 2007 19:15 - 19:22 UT.
Imaging: William Optics Zenithstar 80 ED II APO, f/6.8 [focal length 545 mm], Astronomik L-Infra Red Blocking Filter; SC3a b/w RAW camera.
31 unguided exposures of 9 seconds.