View Full Version : Omega Centauri.

2011-Oct-23, 11:40 AM
Omega Centauri (ω Cen) or NGC 5139 is a globular cluster seen in the constellation of Centaurus, discovered by Edmond Halley in 1677 who listed it as a nebula. Omega Centauri had been listed in Ptolemy's catalog 2000 years ago as a star. Lacaille included it in his catalog as number I.5. It was first recognized as a globular cluster by the English astronomer John William Herschel in the 1830s. Orbiting the Milky Way, it is both the brightest and the largest known globular cluster associated with our galaxy (1.6 Em). Of all the globular clusters in the Local Group of galaxies, only Mayall II in the Andromeda Galaxy is brighter and more massive. ω Centauri is so different from other galactic globular clusters, that it is thought to be of different origin.

Omega Centauri is located about 15,800 light-years (4,850 pc) from Earth and contains several million Population II stars. The stars in its center are so crowded that they are estimated to average only 0.1 light years away from each other. It is about 12 billion years old.

This picture comprises of many very short exposures of 30 Seconds LRGB so i could get right into the core.
Also the galactic sirrus is visible in this image.

The camera is a QHY9 mono on a ED80 guided with a QHY5 on a finderscope.

Large picture here (2Mb) http://martinsastro.net/displayimage.php?album=4&pid=87#top_display_media

Smaller picture here.

Martin Meupelenberg.

2011-Oct-23, 09:38 PM
Nice image. Welcome to BAUT

2011-Oct-23, 10:48 PM
Thank you very much :)

2011-Oct-24, 04:59 AM
Very well done! Makes me pine to take a trip south.

2011-Oct-24, 10:01 PM
Very well done! Makes me pine to take a trip south.

Thank you :)

2011-Oct-25, 12:44 AM
Wow, that looks really cool :)

2011-Oct-25, 01:29 AM
Wow, that looks really cool :)

Thank you Kevin :D
It is one of the objects that is better done with lots of short exposures (not many of those up there).