Deep Sky Object in Spring
M104 (Sombrero Nebula in Virgo)

Date & Time: Mar 4 2017, from 26:25 to 27:01 JST(+0900)
Composed 10 shots with 4 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 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...ISO6400, White Balance...Daylight

M104 (NGC4594) / Galaxy, type SA: asp
R.A.12h 39m 59.3s (2000.0)
Dec.-11° 37' 22" (2000.0)
Apparent Size8.7×3.5'
Radial Velocity+1426km/s
Distance30 million light yrs.
Group of GalaxiesVirgo II Group
Other IDsMCG-2-32-20, UGCA293,
M104 (NGC4594) can be found out in the south sky in spring, near the boundary between Virgo and Corvus. The name "Sombrero Nebula" comes from, you can understand easily, its shape that resembles a Mexican hat. A dark lane that crosses the center can be seen through medium sized scopes, I think it's one of interesting galaxies to appreciate.
Distance is estimated about 30 million light years, and it has a diameter of 75 thousand light years. And additionally, the galaxy is well-known as one of the brightest radio galaxies in the heavens. If you have radio-detectable eyes, M104 will be seen equivalent to about 6th magnitude.
Finding chart of M104 Finding chart of M104

  M104 can be found out from delta Crv (NE star of the square of Corvus), following along gentle star-curve.
(Taken with 6x7 formatted f=165mm telephoto lens)


Around M105

Copyright(c) 2017 by Naoyuki Kurita, All rights reserved.
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