Deep Sky Object in Summer
Seyfert's Sextet (Galaxy Group in Serpens)


Date & Time: May 4 2019, from 26:33 to 27:28 JST(+0900)
Composed 10 shots with 6 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: Canon EOS 6D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(3056×3056)
Device Size...20×20mm, Sensitivity...ISO4000


NGCR.A.Dec.SizeMagnitude
602715h 59m 10.5s+20° 45' 39"0.4×0.2'14.7
6027A15h 59m 11.5s+20° 45' 15"0.7×0.5'14.9
6027B15h 59m 14.8s+20° 46' 00"0.4×0.3'15.3
6027C15h 59m 12.1s+20° 44' 47"0.8×0.2'16.0
6027D15h 59m 13.2s+20° 45' 33"0.1×0.1'15.3
6027E15h 59m 12.7s+20° 45' 47"0.8×0.4'16.5
Around the tip of Serpent's head, this picture has captured a Hickson's compact galaxy group of HCG79. The group has six small galaxies mainly NGC6027. All members have 15th or 16th magnitude in brightness and smaller than an arc minutes.
Generally we can calculate the distance to such a distant object by using of Hubble's law from its red shift that indicates regression velocity. But in case of this HCG79, actually only a members of D has 5 times large regression velocity than that of other members. It can be considered that the galaxy D is not a member of HCG79, but this fact is an example that we have doubts about universality of Hubble's law.

Members of Seyfert's Sextet



NGC5921
NGC6118

Copyright(c) 2019 by Naoyuki Kurita, All rights reserved.
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