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NGC 6751

Emission nebula
Planetary nebula
A Hubble Space Telescope (HST) image of NGC 6751's inner bubble Credit: HST/NASA/ESA.
Observation data: J2000.0 epoch
Right ascension	19 05 55.6
Declination	−05° 59′ 32.9″
Distance	6,500 ly   (2,000 pc)
Apparent magnitude (V)	11.9
Apparent dimensions (V)	0.43′
Constellation	Aquila
Physical characteristics
Radius	0.4 ly
Absolute magnitude (V)	0.4
Designations	Glowing Eye Nebula, GSC 05140-03497, PK 029-05 1, PN Th 1-J, CSI-06-19031, HD 177656, PMN J1905-0559, PN Sa 2-382, EM* CDS 1043, HuLo 1, PN ARO 101, PN G029.2-05.9, GCRV 11549, IRAS 19032-0604, PN VV' 477, SCM 227, GSC2 S3002210353, 2MASX J19055556-0559327, PN VV 219, UCAC2 29903231
See also: Lists of nebulae

NGC 6751, also known as the Glowing Eye Nebula, is a planetary nebula in the constellation Aquila. It is estimated to be about 6,500 light-years (2.0 kiloparsecs) away.

NGC 6751 was discovered by the astronomer Albert Marth on 20 July 1863. John Louis Emil Dreyer, the compiler of the New General Catalogue, described the object as "pretty bright, small". The object was assigned a duplicate designation, NGC 6748.

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 by Gemini.

NGC 6751 is an easy telescopic target for deep-sky observers because its location is immediately southeast of the extremely red-colored cool carbon star V Aquilae.

Properties

NGC 6751, like all planetary nebulae was formed when a dying star threw off its outer layers of gas several thousand years ago. It is estimated to be around 0.8 light-years in diameter.

NGC 6751 has a complex bipolar structure. 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). On both the west and east sides of the inner shell, knots can be seen that are surrounded by faint "lobes". These lobes are actually a ring, and the eastern side is nearer than the western side. As a whole, the system is approaching the Solar System with a heliocentric radial velocity of −31.7 km/s.

The central star of the nebula has a similar spectrum to a Wolf–Rayet star (spectral type ), and has an effective temperature of about 140,000 K and a radius of about 0.13 R_☉. It is losing mass at a rate of 1×10 M_☉ per year, and its surface composition is mostly helium and carbon.

The winning image of the 2009 Gemini Astronomy Contest shows a nebula at the top left of NGC 6751. This 80 x 40 arcsec nebula was discovered in 1990 by Hua & Louise at the Newton focus of the Foucault telescope, 120cm in diameter at Observatoire de Haute Provence (O.H.P.) Saint Michel l'Observatoire.

See also

• List of planetary nebulae

References

1. ^ "NGC 6751". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-04-27.
2. ^ Clark, 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. S2CID 122344448.
3. "NGC/IC Project". Archived from the original on 2009-12-01. Retrieved 2010-01-01.
4. ^ Seligman, Courtney. "New General Catalogue objects: NGC 6750 - 6799". cseligman.com. Retrieved 2021-04-12.
5. Corwin, Harold. "Notes on the NGC objects, particularly those missing, misidentified, or otherwise unusual (ngcnotes.all)". Historically-aware NGC/IC Positions and Notes. Retrieved 2019-08-10.
6. "The Glowing Eye of Planetary Nebula NGC 6751". HubbleSite. 2000-04-06. Retrieved 2021-04-12.
7. "Australian Student's Image Revealed". Gemini Observatory. 2009-07-21. Retrieved 2021-04-12.
8. 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

• Media related to NGC 6751 at Wikimedia Commons
• NASA Astronomy Picture of the Day: Celebrating Hubble With NGC 6751 (16 April 2005)
• NGC 6751 seds.org
• NASA Astronomy Picture of the Day: NGC 6751: The Glowing Eye Nebula (13 March 2013)

v t e Constellation of Aquila
Aquila in Chinese astronomy Smith's Cloud List of stars in Aquila
Stars	Bayer α (Altair) β (Alshain) γ (Tarazed) δ ε ζ (Okab) η θ (Tseen Foo) ι κ λ μ ν ξ (Libertas) ο π σ τ υ φ χ ψ ω ω A b c d e f g h i k l Flamsteed 4 5 7 8 10 11 18 19 20 21 22 23 24 42 45 46 51 56 57 58 62 64 66 68 69 70 14 Sge 62 Ser 64 Sgr Variable R U V W TT FF QS V368 V450 V500 V603 V604 V605 V606 V923 V1286 V1291 V1298 V1302 V1315 V1333 V1339 V1427 V1428 V1429 V1472 V1487 V1494 V1654 V1672 V1691 V1703 (Phoenicia) V1828 V1936 HR 7099 7143 7288 7300 7307 7396 7456 7569 7598 7599 7693 7717 7803 HD 179079 183263 187734 192699 (Chechia) Other CoRoT-2 CoRoT-3 CoRoT-8 Gaia BH3 HAT-P-41 PSR J1856+0245 PSR J1903+0327 PSR B1913+16 (Hulse–Taylor) PSR J1951+1123 SGR 1900+14 SS 433 W43A W49-2 WASP-80 (Petra) WD J1953−1019 ZTF J1901+1458
Exoplanets CoRoT-2b CoRoT-3b CoRoT-8b CoRoT-10b HD 179079 b HD 183263 b c HD 192263 b HD 192699 b ξ Aquilae b
Star clusters NGC 6709 NGC 6738 NGC 6755 NGC 6756 NGC 6760
Nebulae	NGC 6741 6751 6778 6781 6790 Other Abell 48 Abell 70 E Nebula Hen 2-428 HESS J1857+026 W43 W49 W49B W50
Galaxies	NGC 6814 Other IC 1327
Category

• Planetary nebulae
• NGC objects
• Aquila (constellation)
• Henry Draper Catalogue objects