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M57: Ring Nebula in Lyra

RA = 18 hrs 53 min; Dec = 33 deg 01 min.

Date & Site:

Imaged on 5/09/16; Little Blair Valley, CA

Conditions: moderate winds; 55 degrees; transparent; below average seeing


Telescope: DSI 10" RC f/7.3 at 1867 mm fl

Mount: AP 1100 GOTO CP3
Camera: ST-10XME; CFW10; Hutech OAG-5 guider



Exposures: 2 hrs of Lum (15 min subs), 25 min each of RGB (5 min subs) for total of 3.25 hours

M57 is a planetary nebula. Planetary nebulae are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star, which was passing through the last stage in its evolution before collapsing and becoming a white dwarf.

That small galaxy seen below and to the right of the nebula is IC 1296, a barred spiral galaxy located approx. 221 million light years away

Field of View = 11.7 x 7.8 arc minutes

2,300 light years away

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