| Emission nebula | |
|---|---|
| Planetary nebula | |
 Hubble Space Telescope image of NGC 6790 | |
| Observation data: J2000 epoch | |
| Right ascension | 19h 22m 56.966s[1] |
| Declination | +1° 30′ 46.46″[1] |
| Distance | 19 kly (5.7 kpc)[2] ly |
| Apparent magnitude (V) | 10.45[1] |
| Apparent dimensions (V) | 4″ × 3″[2] |
| Constellation | Aquila |
| Designations | BD+01 3979, HD 182083, NSV 11959[3] |
NGC 6790 is a young, compact[2] planetary nebula with a high surface brightness[4] located in the equatorial constellation of Aquila. Imaging by the Hubble Space Telescope shows elongated shells surrounding the central star. The distance to this nebula is poorly known, but is estimated at 19 kilolight-years, and it is roughly 6,000 years old. The expansion velocity of the neutral hydrogen component is in the range 15−19 km s−1.[2] The central star is a white dwarf with a temperature of around 73,500 K and a photographic magnitude of 11.1. It has a mass of 0.6 M☉, having evolved from a star with a mass about the same as the Sun.[4]
References
[edit]- ^ a b c Høg, E.; et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
- ^ a b c d Kang, Eun-Ha; et al. (April 2009). "Raman-Scattered He II λ6545 in the Young and Compact Planetary Nebula NGC 6790". The Astrophysical Journal. 695 (1): 542–551. arXiv:0901.2189. Bibcode:2009ApJ...695..542K. doi:10.1088/0004-637X/695/1/542. S2CID 16336805.
- ^ "NGC 6790". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-05-10.
- ^ a b Aller, Lawrence H.; et al. (June 1996). "The Spectrum of the Planetary Nebula NGC 6790". Publications of the Astronomical Society of the Pacific. 108: 488. Bibcode:1996PASP..108..488A. doi:10.1086/133754.
External links
[edit]- Kaler, James B. "NGC 6790 in Aquila". STARS. Retrieved 2020-05-10.
Media related to NGC 6790 at Wikimedia Commons- The Hubble European Space Agency Information Centre Hubble picture and information on NGC 6790
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