Deep Sky Object in Spring
NGC3666 (Galaxy in Leo)


Date & Time: Dec 27 2025, from 27:33 to 28:28 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


NGC3666 / Galaxy, type SA(rs)c: III
R.A.11h 24m 26.1s (2000.0)
Dec.+11°20' 33" (2000.0)
Apparent Size4.3×1.1'
Radial Velocity+1047km/s
Magnitude12.7
Distance56 million light yrs.
Group of GalaxiesLeo II Group
Other IDsUGC 6420, CGCG 67-71
MCG +2-29-25, PGC 35043
IRAS 11218+1137
NGC3666 is a spiral galaxy seen about 50 arcminutes north of ιLeo, which marks the hind leg of Leo. It is viewed from a nearly edge-on orientation, with a major-axis diameter of just over 4 arcminutes, and no distinct spiral arms are visible. Its distance from the Milky Way is about 56 million light-years, and it is a member of the Leo II Galaxy Group.



NGC3640
NGC3672

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