NGC 6781 (another designation - PK 41-2.1 ) is a planetary nebula in the constellation Oryol .
| NGC 6781 | |
|---|---|
| planetary nebula , bipolar nebula | |
 | |
| Research history | |
| Discoverer | William Herschel |
| opening date | July 30, 1788 |
| Designations | NGC 6781 , PK 41-2.1 |
| Observational data ( Age J2000.0 ) | |
| Right ascension | |
| Declination | |
| Visible magnitude (V) | 11,4 |
| Photographic magnitude (V) | 11.8 |
| Visible Dimensions (V) | 1.9 ' |
| Constellation | Eagle |
This object is one of those listed in the original edition of the New General Catalog .
Despite the fact that NGC 6781 has an elliptical morphology, its kinematic and emission characteristics are rather unusual, which indicates the presence of a bipolar source oriented to the observer line. [1] That is we see a nebula from one of its poles. NGC 6781 has a barrel-shaped structure with a shell of dust enriched with carbon and a surrounding halo, with a temperature of 26-40 kelvins . [2]
Notes
- ↑ JP Phillips, Gerardo Ramos-Larios, Martin A. Guerrero. Optical and Mid-Infrared Observations of the Planetary Nebula NGC 6781 . Arxiv.org (19 Jun 2011). Date of treatment July 8, 2016.
- ↑ T. Uetaey al. The Herschel Planetary Nebula Survey (HerPlaNS) I. Data Overview and Analysis Demonstration with NGC 6781 . Arxiv.org (11 Mar 2014). Date of treatment July 8, 2016.
See also
- List of Messier objects
- New shared directory
Links
- Information in English and French from the original “ New General Catalog ”
- Information (Eng.) From the Revised New General Catalog
- SIMBAD
- VizieR (English)
- NASA / IPAC Extragalactic Database
- List of publications on NGC 6781