Deep Sky Object in Summer
UGC10214 (Tadpole Galaxy in Draco)



Date & Time: May 4 2024, from 21:11 to 23:07 JST(+0900)
Composed 19 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



UGC10214 / Galaxy, type SB(s)c pec
R.A.16h 06m 8.5s (2000.0)
Dec.+55°25' 01" (2000.0)
Apparent Size3.6×0.8'
Radial VelocityN/A
Magnitude14.4
Diatnce450 million light yrs.
Group of GalaxiesN/A
Other IDsMCG9-26-56, CGCG275-23
Arp 188, PGC57129
Around the middle of Dragon's body, this is a deep-deep sky object at 3.2 degrees SSE of beta Draconis. It's a very dimmed galaxy without NGC numbers, recognized by catalogue numbers of UGC10214, Arp 188 and so on. The galaxy has a long axis of only 3 arc minutes and a brightness of 14.4th magnitude.
The galaxy has captured by the Hubble Space Telescope (HST) and its anomalous shape has been become clear. The galaxy has a tail structure stretching toward east with a length of 3 arc minutes; this fact has given this galaxy a nickname of "Tadpole Galaxy". It's considered that the tail with a real length of 300 or 400 thousand light years has formed by a collision with a companion galaxy. Another collided galaxy is concealed just behind UGC10214. It's estimated that the galaxy is about 45 millions light years away.

Tadpole Galaxy captured by HST Tadpole Galaxy captured by HST
© STScI-HST




Abell 2256

Draco Dwarf


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