Deep Sky Object in Summer
M92 (Globular Cluster in Hercules)


Date & Time: Apr 9 2022, from 26:07 to 27:13 JST(+0900)
Composed 4min.×6 shots & 1min.×4 shots
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon&Skyglow 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


M92 (NGC6341) / Globular Cluster, type IV
R.A.17h 17m 5.9s (2000.0)
Dec.+43° 08' 00" (2000.0)
Apparent Size8.3'
Real Size88 light yrs.
Magnitude6.1
Distance36,000 light yrs.
M92 (NGC6341) is a medium-sized globular cluster lies on a line between η and ι Herculis. The cluster is much smaller than M13, The Hercules Cluster, but has a brighter nucleus than the representative globular cluster in summer skies, can easily be detected by binoculars. You'll be able to appreciate M92 like a dimmed nebula with ellipse shape, should need a telescope larger than 20cm(7.8") to resolve individual stars. The cluster has a diameter of 8.3 arc minute and a distance of about 36 thousand light years.



M80
M107

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