Hb 12
| Planetarischer Nebel Hb 12 | |
|---|---|
 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Position Äquinoktium: J2000.0 | |
| Rektaszension | 23h 26m 14,8s [1] |
| Deklination | +58° 10′ 54,7″[1] |
| Erscheinungsbild | |
| Zentralstern | |
| Physikalische Daten | |
| Geschichte | |
| Entdeckung | Edwin Hubble |
| Datum der Entdeckung | 1921 |
| Katalogbezeichnungen | |
| PK 111-02 1 • PN G111.8-02.8 • Hb 12 | |
Hb 12 (Hubble 12) ist ein Planetarischer Nebel, der im Jahr 1921 von Edwin Hubble entdeckt wurde.[2]
Er besitzt eine Sanduhr-förmige Gestalt mit einer Vielzahl von Knoten, die sich mit einer Geschwindigkeit von 120 km/s ausbreiten.[3] Der planetarische Nebel zeichnet sich durch eine der höchsten Oberflächenhelligkeiten aus und weist eine ringförmige Strukturen auf, die vermutlich in Abständen von rund 50 Jahre entstehen.[2]
Weblinks
Einzelnachweise
- ↑ http://vizier.u-strasbg.fr/viz-bin/VizieR-S?PN%20G111.8-02.8
- ↑ a b Sun Kwok, Chih Hao Hsia: Multiple Coaxial Rings in the Bipolar Nebula Hubble 12, bibcode:2007ApJ...660..341K
- ↑ N. M. H. Vaytet et al.: High-speed knots in the hourglass shaped planetary nebula Hubble 12, arxiv:0905.4625
Auf dieser Seite verwendete Medien
Autor/Urheber: Judy Schmidt, Lizenz: CC BY 2.0
You think you know someone and then you look at them in infrared and then wonder what else they aren't showing you. Seriously, I have seen <a href="http://hubblesite.org/newscenter/archive/releases/2013/37/image/a/" rel="nofollow">this picture of the same object</a> at least a dozen times in the past so I didn't expect anything out of the ordinary when I looked at the data in the archive. But there are a whole bunch of infrared observations where these weird, geometric arcs or ovals show up! Fascinating. Note they are a bit blurry as data from NICMOS tends to be. Sometimes I wonder if all the processing I do to its data is right or not but there really are some interesting things there even though it's so messy.
Upon further inspection of the nebula I get a good sense of its dimensionality and to me it appears that we are looking down at an hourglass from a 45° angle or so. I think this is why processing is so addictive. I stare at things for a long time and come away with a much better understanding than I previously had and maybe even some extra information that wasn't in a press release at some point.
Oh, I got rid of the large, distracting diffraction spikes as best I could while doing the least harm to the object that I could manage.
Red: HST_11331_03_NIC_NIC3_F160W_sci + hst_11093_01_wfpc2_f675w_pc_sci + hst_11093_01_wfpc2_f658n_pc_sci Green: hst_11093_01_wfpc2_f656n_pc_sci + hst_11093_01_wfpc2_f555w_pc_sci Blue: hst_11093_01_wfpc2_f502n_pc_sci + hst_06353_08_wfpc2_f487n_pc_sci
North is up.