Deep Sky Object in Summer
Arp 102 (Galaxy in Hercules)



Date & Time: Mar 9 2024, from 26:14 to 27:09 JST(+0900)
Composed 10 shots with 6 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(2040×2040)
Device Size...10×10mm
Sensitivity...ISO4000, White Balance...Daylight



Arp 102 / Galaxy, type SABb pec
R.A.17h 19m 21.4s (2000.0)
Dec.+49°02' 25" (2000.0)
Apparent Size1.4×0.9'
Radial Velocity+7177km/s
Magnitude14.9
Distance331 million light yrs.
Group of Galaxies -
Other IDsUGC 10814, CGCG 252-41
MCG +8-31-43, PGC 60070
This is an image capturing the modest peculiar galaxy Arp 102, lurking at the northernmost tip of Hercules. It is situated 4.6 degrees northwest of iota Herculis. In the center of the image, Arp 102 is characterized by a tongue-like structure extending northward from its main body. Additionally, although extremely faint, a bridge-like structure connecting it to a tiny galaxy (CGCG 252-40) located 3.7 arc minutes southward, can also be observed. It is believed that such peculiar structures are formed through the interaction between these galaxies. The distance to these galaxies is estimated to be around 330 million light-years.




Arp 101

Arp 254


Copyright(c) 2024 by Naoyuki Kurita, All rights reserved.
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