Deep Sky Object in Spring
M83 (Galaxy in Hydra)

Date & Time: Feb 3 2017, from 27:17 to 27:51 JST(+0900)
Composed 12 shots with 3 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
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

M83 (NGC5236) / Galaxy, type SAB(s)c II
R.A.13h 37m 0.2s (2000.0)
Dec.-29° 52' 04" (2000.0)
Apparent Size13×12'
Radial Velocity+786km/s
Distance15.3 million light yrs.
Group of GalaxiesNGC5128 Group
Other IDsESO444-81, MCG-5-32-50,
UGCA366, PGC48082
M83 is a bright galaxy around the tail of Hydra. The galaxy has almost same right ascension with Spica, alpha Vir, and positioned just 19 degrees south of Spica.
M83 has a shape of typical "Bared Galaxy", a clear bar can be seen stretched to NE and SW, and two spirals are coiled up from each tip of the bar. Those unique structures can be captured in films very easily, and you can see those indistinctly with the medium-sized scopes and cleared night sky. It can be said that M83 is a very rare galaxy because we can hardly recognize the spiral structure in almost all other galaxies with naked eyes via telescopes. And it's considered that M83 is only one galaxy the clear spirals had been recorded in sketches before the astro-photographic technology was invented and developed.

M65, M66, NGC3628

M84 & M86

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