Deep Sky Object in Spring
PK221+46.1 (Planetary Nebula in Leo)

Click on image to enlarge

Date & Time: Dec 28 2025, from 27:03 to 29:03 & Jan 17 2026 from 26:17 to 28:50 JST(+0900)
Composed 36 shots with 8 minutes exposed
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with IDAS LPS-D1 Light-pollution suppression filters
Auto-guided with TAKAHASHI JP Equatorial & SBIG STV
CMOS Camera: ZWO ASI2600MC Pro (Cooled temp.: -20°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


PK221+46.1 / Planetary Nebula, type SNR?
R.A.09h 52m 59.1s (2000.0)
Dec.+13°44' 33" (2000.0)
Apparent Size12.0'
Real SizeN/A
Magnitude10.4
DistanceN/A
This image shows you an extraordinary indistinct supernova remnant positioned at 4.3 degrees WNW of Regulus, alpha Leo. Although the remnant has a comparatively larger diameter of 12 arc minutes, is needed a good-conditioned night to take its shape. This image somehow shows a bit warped ring-shape.
This image has been cropped with an equivalent focal length of 700 mm.



PK164+31.1
PK238+34.1

Copyright(c) 2026 by Naoyuki Kurita, All rights reserved.
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