Deep Sky Object in Summer
M57 (Ring Nebula in Lyra)

Date & Time: Mar 11 2005, from 27:45 to 28:11 JST(+0900)
Composed 4 shots with 8 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 D70 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

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

M57 (NGC6720) / Planetary Nebula, type IV
R.A.18h 53m 36.0s (2000.0)
Dec.+33° 02' 00" (2000.0)
Apparent Size1.2×1.0'
Real Size0.87×0.61 light yrs.
Distance2150 light yrs.
M57 (NGC6720) known as the Ring Nebula, is one of the finest planetary nebula in the skies. It's very popular as "The Doughnut Nebula" in Japan. The ring itself should be clearly visible in medium scopes, and better to have high magnification because of its extremely small size of only 80 arc seconds. The central star with the fifteenth magnitude, which had discharged the gas into space, may take a little longer scope.
It is located between beta and gamma Lyrae, and is about 2100 light years away.
Although our naked eyes cannot detect colors of the nebula, this image has captured various colors that the nebula has bluish in the ring, yellow to white the ring itself, and reddish colors in outer edge.

⇒ Display the spectral profile of M57
(in new window)

M27(Dumb-bell Nebula)


Copyright(c) 2005 by Naoyuki Kurita, All rights reserved.
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