File:M57 NGC6720 Lyra, The Ring Nebula, Unmodified Camera (51728967150).jpg
Original file (1,800 × 1,200 pixels, file size: 1,016 KB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit].jpg&action=edit§ion=1){kind=link}
| Description |
M57 NGC6720 Lyra, The Ring Nebula, Unmodified Camera M57 is a planetary nebula discovered by Messier in 1779. It was formed when ionized outer layers of the central star were ejected into space after the star exhausted nuclear fuel, and gravitationally collapsed into a white dwarf. Ultraviolet radiation from the 14.9 magnitude central star is presently exciting the surrounding gas to fluoresce. Blue-green color in the interior of the nebula is due to doubly ionized oxygen fluorescence, while the red color of the outer regions is due to partially ionized hydrogen and nitrogen. The nebula's angular size is 1.6 arcmin, and apparent magnitude 8.8. It lies about 2,600 light years from Earth, and is expanding at 25 km/sec. The light which is presently reaching us from the Ring Nebula was emitted during the time of Homer. The small galaxy NW of the Ring Nebula is IC 1296, a low surface brightness barred spiral, Bmag=15.4, angular size 0.487 arcmin, redshift 0.017065. Its comoving = proper distance is approximately 236 Mly, recession velocity 5,085 km/s, absolute magnitude -19, and actual diameter 32,640 ly, about four times smaller than the Milky Way. When these photons were emitted, Earth was in the Triassic Period in which dinosaurs and mammals were evolving from reptiles following a great extinction event which had exterminated 90% of all life on the planet. From the photons' perspective, time does not pass when travelling at the speed of light, and the journey was instantaneous. Image Details: -Meade 8 ACF, AP 0.7x compressor, 200 x 1400mm -iEQ30pro mount, Orion 60mm f/4 SSAGpro autoguider -Canon 600D unmodified camera, Astronomik L3 filter -15 x 75 sec subs, ISO 1600, 30 dark and 30 bias frames, 50% linear crop, 3x drizzle -Limiting magnitude >18.0 -PHD2, DSS, XnView, StarNet++, and StarTools v 1.3 and 1.7 |
| Date | |
| Source | M57 NGC6720 Lyra, The Ring Nebula, Unmodified Camera |
| Author | Rudy Kokich |
Licensing
[edit].jpg&action=edit§ion=2){kind=link}
|
This work has been released into the public domain by the author on Flickr, where the author has declared it as a "Public Domain Work" and tagged it with the Creative Commons Public Domain Mark.
|
|
The Public Domain Mark (PDM) is not a copyright license, but a symbol used to indicate that a work is in the public domain. When it is applied by the author or the copyright holder, community consensus has decided such works as being public domain in the US and countries where it is legally possible to release own work to the public domain. In the countries where this is not possible, the copyright status of the work remains undetermined.
| ||
If a file is tagged with Public Domain Mark by someone other than the author or the copyright holder, a more specific copyright tag such as one found at Commons:Copyright tags/General public domain must be applied. If this is your own work, please use {{Cc-zero}} instead.
|
|
This image was originally posted to Flickr by rudykokich at https://flickr.com/photos/140097441@N02/51728967150. It was reviewed on 22 April 2024 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:46, 19 December 2021 | | 1,800 × 1,200 (1,016 KB) | Siloepic (talk | contribs) | Transferred from Flickr via #flickr2commons |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
.jpg&oldid=870220608){kind=link}