Deep Sky Object in Summer
M39 (Open Cluster in Cygnus)
|Date & Time: ||Sep 6 2003, from 25:10 to 25:18 JST(+0900)
|Composed 3 shots with 3 minutes exposed|
|Optical: ||TAKAHASHI 16cm(6.3") epsolon (f=530mm, F3.3)
|with IDAS LPS-P1 Light-pollution suppression filter|
|Auto-guided with TAKAHASHI JP equatorial
|Digital Camera: ||Fujifilm FinePix S2 Pro
|Location: ||Ooizumi vil., Yamanashi pref.
|Camera Settings: ||Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)|
|CCD Sensitivity...ISO1600, White Balance...Auto|
M39 is an open cluster about 7 degrees north-east of North American Nebula (NGC7000).
You can find the cluster just in the Milky Way between the tail of Cygnus and Cassiopeia, there are plenty of faint stars that form the autumnal Milky Way around this field.
M39 is large and scattered, telescope is unsuitable for appreciating that, and you should need a small binocular.
About 20 faint stars with about 7th magnitude are forming a rough triangle. The cluster is about 810 light years away.
|M39 (NGC7092) / Open Cluster, type e, III 2 m|
|R.A.||21h 32m 11.9s (2000.0)|
|Dec.||+48° 26' 00" (2000.0)|
|Real Size||7 light yrs.|
|# of Stars||30|
|Distance||810 light yrs.|