Deep Sky Object in Summer
M107 (Globular Cluster in Ophiuchus)


Date & Time: Mar 20 2023, from 26:11 to 26:40 JST(+0900)
Composed 8 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


M107(NGC6171) / Globular Cluster, type X
R.A.15h 17m 24.0s (2000.0)
Dec.-21° 01' 00" (2000.0)
Apparent Size2.2'
Real Size36 light yrs.
Magnitude9.2
Distance56 thousand light yrs.
A tiny globular cluster of M107 is positioned at 2.6 degrees SSW of zeta Oph. The cluster has an apparent diameter of a bit larger than 2 arc minutes and a visual brightness of about 9, you can able to see it like a nebula only with binoculars. M107 has a concentration class of the tenth in twelve levels, fairly sparse globular. But the cluster is very small, so it's difficult to resolve member stars even if you see it through telescopes. There are various globular clusters around the field of Scorpius to Ophiuchus. M107 has a fairly poor appearance in those.



M92
NGC5824

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