NGC 6751
| Emission nebula | |
|---|---|
| Planetary nebula | |
 | |
| Observation data: J2000.0epoch | |
| Right ascension | 19h05m55.6s[1] |
| Declination | −05° 59′ 32.9″[1] |
| Distance | 6,500ly(2,000[2]pc) |
| Apparent magnitude(V) | 11.9[3] |
| Apparent dimensions (V) | 0.43′ |
| Constellation | Aquila |
| Physical characteristics | |
| Radius | 0.4 ly |
| Absolute magnitude(V) | 0.4 |
| Designations | Glowing Eye Nebula,GSC05140-03497,PK029-05 1,PN Th1-J,CSI-06-19031,HD177656,PMNJ1905-0559,PNSa 2-382,EM* CDS1043,HuLo1,PN ARO101,PNG029.2-05.9,GCRV11549,IRAS19032-0604,PN VV'477,SCM227,GSC2S3002210353,2MASXJ19055556-0559327,PN VV219,UCAC229903231 |
NGC 6751,also known as theGlowing Eye Nebula,[2]is aplanetary nebulain theconstellationAquila.It is estimated to be about 6,500light-years(2.0 kiloparsecs) away.[2]
NGC 6751 was discovered by the astronomerAlbert Marthon 20 July 1863.[4]John Louis Emil Dreyer,the compiler of theNew General Catalogue,described the object as "pretty bright, small".[4]The object was assigned a duplicate designation, NGC 6748.[4][5]
The nebula was the subject of the winning picture in the 2009 Gemini School Astronomy Contest, in which Australian high school students competed to select an astronomical target to be imaged byGemini.
NGC 6751 is an easy telescopic target fordeep-skyobservers because its location is immediately southeast of the extremely red-colored coolcarbon starV Aquilae.
Properties
[edit]NGC 6751, like allplanetary nebulaewas formed when a dyingstarthrew off its outer layers of gas several thousand years ago. It is estimated to be around 0.8 light-years in diameter.[6]
NGC 6751 has a complexbipolarstructure. There is a bright, inner bubble (shown in the photo), as well as two fainter halos. (The outer halo, with a radius of 50″ is extremely faint and is broken, while the inner halo with a radius of 27″ is roughly spherical).[2]On both the west and east sides of the inner shell, knots can be seen that are surrounded by faint "lobes".[2]These lobes are actually a ring, and the eastern side is nearer than the western side.[2]As a whole, the system is approaching the Solar System with a heliocentricradial velocityof −31.7 km/s.[2]
The central star of the nebula has a similar spectrum to aWolf–Rayet star(spectral type [WC4]),[1]and has aneffective temperatureof about 140,000 K and a radius of about 0.13R☉.It is losing mass at a rate of1×10−6M☉per year, and its surface composition is mostlyheliumandcarbon.[2]
The winning image of the 2009 Gemini Astronomy Contest shows a nebula at the top left of NGC 6751.[7]This 80 x 40 arcsec nebula was discovered in 1990 by Hua & Louise at the Newton focus of the Foucault telescope, 120cm in diameter atObservatoire de Haute Provence(O.H.P.) Saint Michel l'Observatoire.[8]
See also
[edit]References
[edit]- ^abc"NGC 6751".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2007-04-27.
- ^abcdefghClark, D. M.; García-Díaz, Ma. T.; López, J. A.; Steffen, W. G.; Richer, M. G. (2010). "Shaping the Glowing Eye Planetary Nebula, NGC 6751".The Astrophysical Journal.722(2): 1260–1268.Bibcode:2010ApJ...722.1260C.doi:10.1088/0004-637X/722/2/1260.S2CID122344448.
- ^"NGC/IC Project".Archived fromthe originalon 2009-12-01.Retrieved2010-01-01.
- ^abcSeligman, Courtney."New General Catalogue objects: NGC 6750 - 6799".cseligman.com.Retrieved2021-04-12.
- ^Corwin, Harold."Notes on the NGC objects, particularly those missing, misidentified, or otherwise unusual (ngcnotes.all)".Historically-aware NGC/IC Positions and Notes.Retrieved2019-08-10.
- ^"The Glowing Eye of Planetary Nebula NGC 6751".HubbleSite.2000-04-06.Retrieved2021-04-12.
- ^"Australian Student's Image Revealed".Gemini Observatory. 2009-07-21.Retrieved2021-04-12.
- ^Hua, C. T.; Louise, R. (1990). "The emission line nebulosity near the planetary nebula NGC 6751".Astronomy and Astrophysics.235:403.Bibcode:1990A&A...235..403H.
External links
[edit]
Media related toNGC 6751at Wikimedia Commons- NASA Astronomy Picture of the Day: Celebrating Hubble With NGC 6751 (16 April 2005)
- NGC 6751seds.org
- NASA Astronomy Picture of the Day: NGC 6751: The Glowing Eye Nebula (13 March 2013)
