Deep Sky Object in Spring
PK339+88.1 & NGC4725 (Planetary Nebula & Galaxy in Coma Berenices)

Click on image to enlarge

Date & Time: Apr 26 2025, from 23:33 to 24:45 JST(+0900)
Composed 10 shots with 8 minutes exposed
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with IDAS LPS-D1 light-pollution suppression filter
Auto-guided with TAKAHASHI JP Equatorial & ZWO ASI183MC + PHD2
CMOS Camera: ZWO ASI2600MC Pro (Cooled temp.: -15°C)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...16bit FITS, converted to 16bit TIFF(6248×4176)
Device Size...23.5×15.7mm, Gain...100


PK339+88.1 / Planetary Nebula
R.A.12h 55m 33.8s (2000.0)
Dec.+25° 53' 30" (2000.0)
Apparent Size10.8'×7.6'
Real SizeN/A
Magnitude -
DistanceN/A
NGC4725 / Galaxy, type SAB(r)ab pec II
R.A.12h 50m 26.7s (2000.0)
Dec.+25° 30' 01" (2000.0)
Apparent Size10.8×7.6'
Radial Velocity+1243km/s
Magnitude9.8
Distance42 million light yrs.
Group of GalaxiesNGC4565 Group
Other IDsUGC7989,MCG4-30-22
CGCG129-27,PGC43451
This image has captured a striking galaxy NGC4725 and an indistinct but larger-sized planetary nebula of PK339+88.1 at 1.2 degrees ENE of the galaxy in the northern part of Coma Berenices. The planetary has almost the largest diameter (9 arc minutes) in all planetary nebulae in spring sky. However the nebula is not eligible to naked eye-observation due to its lower luminance. This image indicates that the nebula is emitting bluish light in disk-shape around an 8.8th magnitude central dead star; it's considered that the planetary is comparatively aged one.
This image has been cropped with an equivalent focal length of 700 mm.



ESO378-1
M44(The Praesepe)

Copyright(c) 2025 by Naoyuki Kurita, All rights reserved.
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