Deep Sky Object in Spring
Around NGC5216, NGC5218 (Arp 104, Galaxies in Ursa Major)


Date & Time: Mar 1 2019, from 27:59 to 28:53 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 & Pictor 201XT
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


A galactic pair in upper left hand side of this picture is positioned at northern Ursa Major near a boundary on Draco, having IDs of NGC5216 and NGC5218 in lower and upper ones respectively. These two galaxies are paralleling with an interval of 4 arc minutes; we can clearly recognize a 22,000 light years-long straight-shaped bridge structure connecting them. They're floating about 17 million light years away. The galaxy system is called "Keenan's system" named after an astronomer who firstly researched the connecting structure. Additionally, another dimmed spiral galaxy with a diameter of 3arc minutes lying about 18 arc minutes southwest from the system has an ID of NGC 5205.

NGC5216 / Galaxy, type E0 pec
R.A.13h 32m 06.7s (2000.0)
Dec.+62°42' 01" (2000.0)
Apparent Size2.4×1.8'
Radial Velocity+2949km/s
Magnitude13.6
Distance17 million light yrs.
Group of Galaxies -
Other IDsUGC 8528, CGCG 316-19
CGCG 317-2, MCG +11-17-4
PGC 47598
NGC5218 / Galaxy, type SB(s)b? pec
R.A.13h 32m 08.8s (2000.0)
Dec.+62°45' 53" (2000.0)
Apparent Size2.9×1.6'
Radial Velocity+2807km/s
Magnitude12.3
Distance17 million light yrs.
Group of Galaxies -
Other IDsUGC 8529, CGCG 316-20
CGCG 317-3, Arp 104
MCG +11-17-5, IRAS 13304+6301
PGC 47603
NGC5205 / Galaxy, type S?
R.A.13h 30m 03.4s (2000.0)
Dec.+62°30' 41" (2000.0)
Apparent Size3.2×1.8'
Radial Velocity+1780km/s
Magnitude13.2
Distance84 million light yrs.
Group of Galaxies -
Other IDsUGC 8501, CGCG 316-17
MCG +11-17-3, IRAS 13283+6245
PGC 47425



NGC5204
NGC5297

Copyright(c) 2019 by Naoyuki Kurita, All rights reserved.
To top page To Deepsky in Spring index Ursa Major