Deep Sky Object in Summer
M9 (Globular Cluster in Ophiuchus)

Click on image to enlarge

Date & Time: Apr 22 2023, from 25:51 to 26:36 JST(+0900)
Composed 12 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


M9 (NGC6333) / Globular Cluster, type VIII
R.A.17h 19m 12.0s (2000.0)
Dec.-18° 31' 00" (2000.0)
Apparent Size6.0'
Real Size45 light yrs.
Magnitude7.3
Distance26,000 light yrs.
M9 is a compact globular cluster floating in the Milky Way about 3.5 degrees southeast of zeta Oph around underfoot of Serpent holder. Although the globular cluster has not so high stellar density, it has a diameter of at most 6 arc minutes. Small scopes cannot show you individual member stars although you will be able to appreciate a bright light spot like a nebula. This image shows you dark region without stars just southwest side of the cluster, it's a part of huge dark nebulosities distributed around the Milky Way.



M5
M10

Copyright(c) 2023 by Naoyuki Kurita, All rights reserved.
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