Deep Sky Object in Summer
IC1257 (Globular Cluster in Ophiuchus)


Date & Time: May 3 2022, from 25:06 to 25:42 JST(+0900)
Composed 10 shots with 4 minutes exposed
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


IC1257 / Globular Cluster
R.A.17h 27m 08.0s (2000.0)
Dec.-07°05' 36" (2000.0)
Apparent Size5.0'
Real Size38 light yrs.
Magnitude13.1
Distance26 thousand light yrs.
A small globular cluster positioned in the pentagon of Ophiuchus is IC1257. You can find out at about 4.6 degrees southwest of M14, a larger globular cluster. IC1257 has an apparent diameter of 5 arc minutes and brightness of 13th magnitude, classified as fairly smaller class cluster. This image shows only nebula like figure and respective stars cannot be resolved. The distance from the solar system has been estimated as about 26 thousand light years.



NGC7006
IC1276

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