Deep Sky Object in Spring
NGC3640 (Galaxy in Leo)


Date & Time: Feb 11 2024, from 23:50 to 24:33 JST(+0900)
Composed 8 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


NGC3640 / Galaxy, type E3
R.A.11h 21m 6.7s (2000.0)
Dec.+03° 14' 08" (2000.0)
Apparent Size4.0×3.2'
Radial Velocity+1662km/s
Magnitude11.3
Distance77 million light yrs.
Group of GalaxiesLeo II - NGC3640 Group
Other IDsUGC 6368, MCG +1-29-33
CGCG 39-130, PGC 34778
NGC3630 / Galaxy, type S0 sp
R.A.11h 20m 17.0s (2000.0)
Dec.+02°57' 51" (2000.0)
Apparent Size2.8×1.1'
Radial Velocity+1509km/s
Magnitude12.9
Distance62 millions light yrs.
Group of GalaxiesLeo II - NGC3640 Group
Other IDsUGC 6349, CGCG 39-124
MCG +1-29-31, PGC 34698
The small elliptical galaxy located at the tip of the hind leg of Leo is NGC3640. It has a major axis of about 4 arc minutes and a brightness of 11.3rd magnitude. It has a slightly flattened shape in the north-south direction, and no particularly clear structure is observed. A small NGC3641 is located 2 arc minutes south of NGC3640, and a spindle-shaped NGC3630 can be seen at 20 arc minutes southwest of it.



NGC3621
NGC3672

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