NGC 6751

Short description: Planetary nebula in the constellation Aquila

NGC 6751Emission 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|  19h 05m 55.6s[1]
Declination| −05° 59′ 32.9″[1]
Distance| 6,500 ly (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, 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,[2] is a planetary nebula in the constellation Aquila. It is estimated to be about 6,500 light-years (2.0 kiloparsecs) away.[2]

NGC 6751 was discovered by the astronomer Albert Marth on 20 July 1863.[4] John Louis Emil Dreyer, the compiler of the New 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 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.

## Contents

* 1 Properties
* 2 See also
* 3 References
* 4 External links

## 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.[6]

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).[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 heliocentric radial velocity of −31.7 km/s.[2]

The central star of the nebula has a similar spectrum to a Wolf–Rayet star (spectral type [WC4]),[1] 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 1×10−6 M☉ per year, and its surface composition is mostly helium and carbon.[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 at Observatoire de Haute Provence (O.H.P.) Saint Michel l'Observatoire.[8]

## See also

* List of planetary nebulae

## References

1. ↑ 1.0 1.1 1.2 "NGC 6751". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6751.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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. doi:10.1088/0004-637X/722/2/1260. Bibcode: 2010ApJ...722.1260C.
3. ↑ "NGC/IC Project". http://www.ngcicproject.org/dss/dss_ngc.asp.
4. ↑ 4.0 4.1 4.2 Seligman, Courtney. "New General Catalogue objects: NGC 6750 - 6799". http://cseligman.com/text/atlas/ngc67a.htm#6751.
5. ↑ Corwin, Harold. "Notes on the NGC objects, particularly those missing, misidentified, or otherwise unusual (ngcnotes.all).". http://haroldcorwin.net/ngcic/ngcnotes.all.
6. ↑ "The Glowing Eye of Planetary Nebula NGC 6751". 2000-04-06. https://hubblesite.org/image/956/gallery.
7. ↑ "Australian Student's Image Revealed". Gemini Observatory. 2009-07-21. http://www.gemini.edu/node/11329.
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

* 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

Aquila constellation

Stars
(list)|

| 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
* ω1
* ω2

|

Flamsteed|

* 4
* 5
* 7
* 8
* 10
* 11
* 12 (i)
* 14 (g)
* 15 (h)
* 18
* 19
* 20
* 21
* 22
* 23
* 24
* 26 (f)
* 27 (d)
* 28 (A)
* 31 (b)
* 35 (c)
* 36 (e)
* 37 (k)
* 42
* 45
* 46
* 51
* 56
* 57
* 58
* 62
* 64
* 66
* 68
* 69
* 70
* 71 (l)
* 14 Sge
* 62 Ser

Variable|

* R
* U
* V
* W
* RR
* RT
* SZ
* TT
* UU
* VX
* AA
* CI
* DO
* EL
* FF
* FM
* FN
* KL
* KO
* KP
* OO
* QS
* QY
* V337
* V341
* V346
* V368
* V374
* V417
* V450
* V500
* V536
* V603
* V604
* V605
* V606
* V725
* V794
* V803
* V805
* V822
* V889
* V923
* V1182
* V1208
* V1229
* V1286
* V1291
* V1302
* V1315
* V1333
* V1339
* V1370
* V1379
* V1401 (64 Sgr)
* V1402
* V1412
* V1413
* V1419
* V1425
* V1427
* V1429
* V1432
* V1449
* V1472
* V1493
* V1494
* V1654
* V1663
* V1691
* V1703

HR|

* 7085
* 7099
* 7143
* 7163
* 7208
* 7214
* 7269
* 7288
* 7300
* 7307
* 7313
* 7325
* 7349
* 7353
* 7354
* 7389
* 7396
* 7397
* 7404
* 7407
* 7412
* 7432
* 7438
* 7449
* 7456
* 7471
* 7516
* 7541
* 7542
* 7559
* 7562
* 7569
* 7598
* 7599
* 7636
* 7637
* 7648
* 7681
* 7693
* 7700
* 7717
* 7768
* 7794
* 7803
* 7809
* 7878

HD|

* 179079
* 179218
* 182040
* 183263
* 184279
* 185966
* 186535
* 187734
* 190073
* 192086
* 192699
* 194263
* 195617

Gliese|

* Gliese 735
* Gliese 752

Other|

* AFGL 2298
* B335
* CoRoT-2
* CoRoT-3
* CoRoT-8
* GRS 1915+105
* 1H 1905+000
* J1953−1019
* LDS 678
* NSVS 14256825
* PSR B1853+01
* PSR B1955+09
* PSR B1913+16 (Hulse–Taylor)
* PSR B1915+13
* PSR B1916+14
* PSR B1929+10
* PSR B1933+16
* PSR J1846-0258
* PSR J1903+0327
* PSR J1951+1123
* SGR 1900+14
* SS 433
* 4U 1907+09
* VB 10
* W43A
* W51 e2
* W51 North
* W51 IRS 2
* WR 123

Former|

* ρ (Tso Ke)
* 1
* 2
* 3
* 6
* 9

Star
clusters|

| Open|

* NGC 6709
* NGC 6755
* NGC 6756
* NGC 6837

|

Globular|

* NGC 6749
* NGC 6760

Nebulae|

| Star-forming|

* G29.96-0.02
* G31.31+0.31
* G34.26+0.15
* G35.2-0.74
* G45.45+0.06
* W43
* W48
* W49
* W49A
* W49N
* W51
* W51A
* IRAS 19111+1048

|

Planetary|

* Abell 58
* Abell 70
* IC 4846
* Me 1-1
* NGC 6741
* NGC 6751
* NGC 6772
* NGC 6778
* NGC 6781
* NGC 6790
* NGC 6803
* NGC 6804
* NGC 6807
* NGC 6852
* Sh 2-71
* Vy 2-2

SNR|

* 3C 391
* 3C 396
* 3C 397
* Kes 75
* Kes 79
* W44
* W49B
* W50
* W51C

Galaxies|

| NGC|

* 6814
* 6821
* 6865
* 6900
* 6901
* 6906
* 6915
* 6922
* 6926
* 6929
* 6941

|

Other|

* 3C 403
* QSO B1937-1009

Other|

* Smith's Cloud

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