Ring Nebula (M57; NGC 6720)

A bright planetary nebula in the constellation Lyra. It has the appearance of a slightly elliptical luminous ring around a central star. The radius is one-third of a light year, and the nebula is 2,000 light years away. If it has always expanded at its current rate of 19 km/s, it is about 5,500 years old.

 

 

 

 Date

 ...

 Location

 Hohe Wand, NÖ

 Film

 Kodak Ektapress PJ400

 Exposure Time

 2 * 50 minutes

 Optics

 Meade 10" f/6,3 + GEG + Teleconverter 2x + Canon EOS 5000

 effective F.L.

3600 mm (f/14,2)

Mount & Guiding

G-11 & ST-4. ST-4 Exposure Time was ... Maximum Error was ...

Processing

 digital composite

 


 

 Date

2003-05-23

 Location

Waldreichs

CCD

SBIG ST-237A

 Exposure Time

L:20 R:10 G:10 B:10 minutes

 Optics

Optolyth 100/700mm APO

 effective F.L.

700mm (f/7)

Mount & Guiding

G-11, ST-4

 


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