Deep Sky Object in Summer
M4 (Globular Cluster in Scorpius)
|Date & Time: ||Apr 12 2003, from 27:07 to 27:12 JST(+0900)
|Composed 2 shots with 4 minutes exposed|
|Optical: ||VIXEN 20cm(7.9") VISAC with conversion lens (f=1278mm, F6.4)
|Auto-guided with TAKAHASHI JP Equatorial & Meade Pictor 201XT
|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|
A globular cluster located just one degree west of Antares is M4 (NGC6121).
It's very close from the Antares, so we can find easily the cluster with binoculars,
but without a larger telescope it will not appear very spectacular.
|M4 (NGC6121) / Globular Cluster, type IX|
|R.A.||16h 23m 36.0s (2000.0)|
|Dec.||-26° 32' 00" (2000.0)|
|Real Size||95 light yrs.|
|Distance||7000 light yrs.|
M4 is characteristic as its reddish color although we cannot detect the peculiar colors in almost all of other globular clusters.
The cluster consists of about 10 thousand stars, and about seven thousand light years away.
Wide-field image around M4 & Antares (70KB)