Deep Sky Object in Summer
M5 (Globular Cluster in Serpens)

Click on image to enlarge

Date & Time: Apr 22 2023, from 24:29 to 25:42 JST(+0900)
Composed 13 shots with 4 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with IDAS LPS-P1 Light-pollution suppression filter
Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080)
Device Size...20×20mm
Sensitivity...ISO4000, White Balance...Daylight


M5 (NGC5904) / Globular Cluster, type V
R.A.15h 18m 36.0s (2000.0)
Dec.+02° 05' 00" (2000.0)
Apparent Size12.7'
Real Size130 light yrs.
Magnitude6.2
Distance27,000 light yrs.
M5 (NGC5904) is a spectacular globular cluster in the constellation of Serpens Caput (head), with a size of about 13 arc minutes. There is a star "5 Serpentis" with magnitude of 5 just 30' SE of M5, the star is a good mark to search the cluster with telescopes. You can see the star at the lower left hand side in this photograph. The cluster has nearly similar size with M13 in Hercules; it's one of representative globular clusters in summer sky.
M5 is a globular cluster with the largest real size of 130 light years in Messier's catalogue. Distance is 27 thousand light years away.



M4
M9

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