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NGC 7020
The ringed galaxy NGC 7020.
Observation data (J2000 epoch)
Constellation	Pavo
Right ascension	21 11 20.1
Declination	−64° 01′ 31″.
Redshift	0.010677
Heliocentric radial velocity	3201 km/s
Distance	138 Mly (42.4 Mpc)
Apparent magnitude (V)	12.78
Characteristics
Type	(R)SA0^+(r)
Size	~110,000 ly (33.6 kpc) (estimated)
Apparent size (V)	3.7 x 1.8
Other designations
NGC 7021, ESO 107-13, PGC 66291

NGC 7020 is a barred lenticular galaxy located about 140 million light-years away in the constellation Pavo. NGC 7020 was discovered by astronomer John Herschel on August 31, 1836.

Physical characteristics

NGC 7020 has a large outer ring surrounding a bright inner hexagonal zone containing an inner ring and possibly a bar. The large outer ring is completely detached from the inner hexagonal zone of the galaxy and is dominated by numerous flocculent spiral features. The outer ring has an estimated diameter of 110,000 ly (33.6 kpc). The ring is knotty and bluer than the rest of the galaxy and shows where recent star formation is occurring in NGC 7020. The possible inner ring shows protruding features at the ends of its major axis therefore classifying it as a bar. The galaxy appears to be fairly free of ionized gas, which is not surprising for an early-type galaxy.

Nearby galaxies

NGC 7020 is member of a sparse group of galaxies that contains IC 5084, IC 5092, IC 5096, NGC 6943, NGC 7083, NGC 7096, NGC 7125, NGC 7126 and ESO 107-14. However, NGC 7020 is not interacting with any other galaxy in the group.

See also

• NGC 7098
• NGC 7013
• NGC 4429 galaxy in the Virgo Cluster with a similar structure
• List of NGC objects (7001–7840)

References

1. ^ "NASA/IPAC Extragalactic Database". Results for NGC 7020. Retrieved 2017-06-06.
2. ^ Grouchy, R. D.; Buta, R. J; Salo, H.; Laurikainen, E. (3 May 2010). "Ring Star Formation Rates in Barred and Nonbarred Galaxies". The Astronomical Journal. 139 (6): 2465–2493. arXiv:1004.5063. Bibcode:2010AJ....139.2465G. doi:10.1088/0004-6256/139/6/2465. S2CID 119099302.
3. Rojas, Sebastián García. "Galaxy NGC 7020 - Galaxy in Pavo Constellation · Deep Sky Objects Browser". DSO Browser. Archived from the original on 2017-08-13. Retrieved 2017-06-07.
4. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-09-23.
5. "New General Catalog Objects: NGC 7000 – 7049". cseligman.com. Retrieved 2017-04-15.
6. "NGC 7020 - (R)SAB(r?)0/a". Retrieved 2017-06-07.
7. Buta, R. (June 1990). "Weakly barred early-type ringed galaxies. III - The remarkable outer-ringed S0+ galaxy NGC 7020". The Astrophysical Journal. 356: 87–99. Bibcode:1990ApJ...356...87B. doi:10.1086/168819. ISSN 0004-637X.
8. Ronald, Buta (November 1990). "The ringed X-galaxy NGC 7020". NASA Conference Publication. 3098 (124): 189. Bibcode:1990NASCP3098..189B.

External links

• NGC 7020 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

v t e Constellation of Pavo
List of stars in Pavo Pavo in Chinese astronomy
Stars	Bayer α (Peacock) β γ δ ε ζ η θ ι κ λ μ μ ν ξ ο π ρ σ τ υ φ φ ω Variable R V X Y SX AR BD KZ MW NU NZ V346 V347 HR 6586 6624 6634 6740 6760 6796 6805 6808 6828 6899 6908 6939 6996 7004 7012 7015 7022 7027 7111 7130 7161 7221 7278 7320 7383 7434 7435 7455 7498 7513 7527 7531 7558 7579 7587 7588 7644 7663 7691 7707 7732 7838 7872 7959 8019 8061 8073 8081 8125 8159 HD 161475 162521 164427 175007 175167 176522 179419 181433 186302 190984 192887 195190 195772 196050 Other Gliese 693 SCR 1845−6357 SCR 1826−6542
Exoplanets HD 175167 b HD 181433 b c d HD 190984 b HD 196050 b
Galaxies	NGC 6744 6753 6782 6810 6872 7020 7032 7059 Other Bedin I IC 4662 IC 4687 IC 4710 IC 4970 IC 5052 IRAS 19254-7245
Galaxy clusters NGC 6752
Category

• Ring galaxies
• Lenticular galaxies
• Barred lenticular galaxies
• Pavo (constellation)
• NGC objects
• Principal Galaxies Catalogue objects
• Astronomical objects discovered in 1836