Deep Sky Object in Spring
NGC3115 (Spindle Galaxy in Sextans)

Date & Time: Mar 28 2009, from 22:44 to 23:20 JST(+0900)
Composed 4shots with 12 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon & Skyglow filter
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Nikon D50 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 8bit TIFF(3008×2000)
CCD Sensitivity...ISO1600

NGC3115 / Galaxy, type S0-sp
R.A.10h 05m 14.1s (2000.0)
Dec.-07° 43' 07" (2000.0)
Apparent Size7.2×2.5'
Radial Velocity+492km/s
Distance21.8 million light yrs.
Group of GalaxiesNGC3115 Group
Other IDsMCG-1-26-18, UGCA199
A minor constellation of Sextans is lying just south of Leo in the spring skies, and a bright edge-on galaxy of NGC3115 is positioned around the southern edge of this inconspicuous constellation. The galaxy can be caught in view circle of telescopes by using of alpha Hydrae (Alphard) as a guide star and trace 9.3 degrees east from the star.
It's a noticeable characteristic that the galaxy's central bulge is fairly larger than that of many other typical edge-on galaxies like NGC4565. This apparent shape of NGC3115 has given a nickname of "Spindle Galaxy". You can see a considerably bright nucleus through large-sized telescopes, and looks like a simple oval lump of light rather than the shape of spindle. NGC3115 has been classified in a group of "Lenticular (S0)", and a distance is estimated about 22 million light years.


NGC3166 & NGC3169

Copyright(c) 2009 by Naoyuki Kurita, All rights reserved.
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