NGC 7222 is a large barred spiral galaxy with a ring structure,[1] located in the constellation Aquarius.[2] It is located 570 million light-years away from the Solar System[3] and was discovered by German astronomer, Albert Marth on August 11, 1864.[4]

NGC 7222
Sloan Digital Sky Survey image of barred spiral galaxy NGC 7222
Observation data (J2000 epoch)
ConstellationAquarius
Right ascension22h 10m 51.760s
Declination+02d 06m 20.87s
Redshift0.041195
Heliocentric radial velocity12,350 km/s
Distance568 Mly (174.1 Mpc)
Apparent magnitude (V)14.59
Surface brightness14.20 mag/am
Characteristics
Size281,000 ly
Apparent size (V)1.2 x 1.2 arcmin
Other designations
PGC 68224, UGC 11934, CGCG 377-035, MCG +00-56-012, 2MASX J22105172+0206205, NSA 149629, SDSS J221051.74+020620.9, LEDA 68224

NGC 7222 has a luminosity class of II and it has a broad H I line which contains regions of ionized hydrogen.[3] NGC 7222 also has a surface brightness of 14.20 mag/am, which means it is considered a low surface brightness galaxy (LSB).[5] LSBs are diffuse galaxies that have surface brightness one magnitude lower compared to the ambient night sky.

Supernova

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One supernova has been discovered in NGC 7222 so far: SN 2008dr.

SN 2008dr

SN 2008dr was discovered by a team of astronomers; J. Leja, D. Madison, W. Li, and A. V. Filippenko from University of California, Berkeley as part of Lick Observatory Supernova Search (LOSS).[6] It had a magnitude of 16.8 and was located 1".3 west and 8".1 north of the nucleus.[7][8] SN 2008dr was confirmed to be a Type Ia.[9][10]

Companion galaxy

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NGC 7222 with PGC 68229 (left)

NGC 7222 has a companion which is a spiral galaxy, PGC 68229, also known as CGCG 377-036.[11] The galaxy is located west of NGC 7222 at close proximity and is 579 million light-years distant.[12] It is possible both galaxies together make up a galactic pair.[4]

References

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  1. ^ "HyperLeda -object description". atlas.obs-hp.fr. Retrieved 2024-05-06.
  2. ^ "NGC 7222". spider.seds.org. Retrieved 2024-05-10.
  3. ^ a b "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-05-06.
  4. ^ a b "NGC Objects: NGC 7200 - 7249". cseligman.com. Retrieved 2024-05-06.
  5. ^ "Data from revised NGC and IC catalogue by Wolfgang Steinicke, NGC 7200 to 7299". astrovalleyfield.ca. Retrieved 2024-05-06.
  6. ^ Leja, J.; Madison, D.; Li, W.; Filippenko, A. V. (2008-06-01). "Supernovae 2008ct, 2008dq, 2008dr, and 2008ds". Central Bureau Electronic Telegrams. 1419: 1. Bibcode:2008CBET.1419....1L.
  7. ^ "SN 2008dr". w.astro.berkeley.edu. Retrieved 2024-05-06.
  8. ^ "Bright Supernovae - 2008". www.rochesterastronomy.org. Retrieved 2024-05-06.
  9. ^ "SN 2008dr | Transient Name Server". www.wis-tns.org. Retrieved 2024-05-06.
  10. ^ González-Gaitán, S.; Hsiao, E. Y.; Pignata, G.; Förster, F.; Gutiérrez, C. P.; Bufano, F.; Galbany, L.; Folatelli, G.; Phillips, M. M.; Hamuy, M.; Anderson, J. P.; de Jaeger, T. (2014-10-23). "DEFINING PHOTOMETRIC PECULIAR TYPE Ia SUPERNOVAE". The Astrophysical Journal. 795 (2): 142. arXiv:1409.4811. Bibcode:2014ApJ...795..142G. doi:10.1088/0004-637x/795/2/142. ISSN 1538-4357.
  11. ^ "HyperLeda -object description for PGC 68229". atlas.obs-hp.fr. Retrieved 2024-05-06.
  12. ^ "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-05-06.