Deep Sky Object in Spring
NGC4689 (Galaxy in Coma Berenices)



Date & Time: Dec 17 2023, from 27:16 to 28:10 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(4080×4080)
Device Size...20×20mm
Sensitivity...ISO4000, White Balance...Daylight



NGC4689 / Galaxy, type SA(rs)bc
R.A.12h 47m 45.8s (2000.0)
Dec.+13°45' 51" (2000.0)
Apparent Size4.3×3.4'
Radial Velocity+1522km/s
Magnitude11.6
Distance54 million light yrs.
Group of GalaxiesVirgo Cluster
Other IDsUGC 7965, CGCG 71-43
MCG +2-33-22, PGC 43186
IRAS 12452+1402
NGC 4689 is a face-on galaxy situated at the boundary of the constellations Coma Berenices and Virgo, approximately 4.5 degrees northwest of ε Virginis. This region corresponds to the easternmost edge of the Virgo Cluster. The apparent diameter of this galaxy is around 4 arcminutes, and it has a brightness of 11th magnitude.
While the central bulge and its surrounding inner ring are distinct, the outer spiral structure appears very faint. Interactions within the Virgo Cluster have led to the stripping of interstellar gas in this galaxy, resulting in a significantly reduced level of star-forming activity. Galaxies exhibiting such characteristics are referred to as "anemic galaxies".




NGC4676(The Mice)

NGC4697, NGC4699


Copyright(c) 2023 by Naoyuki Kurita, All rights reserved.
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