GR 8 (galaxy)

GR 8
True-color reproduction of the HST WFPC2 image of the dI galaxy GR 8.
Observation data (J2000 epoch)
Constellation	Virgo
Right ascension	12^h 58^m 40.4^s[1]
Declination	+14° 13′ 03″[1]
Redshift	214 ± 0 km/s[1]
Distance	7.9 Mly (2.4 Mpc)
Apparent magnitude (V)	14.7[1]
Characteristics
Type	ImV[1]
Apparent size (V)	1′.1 × 1′.0[1]
Other designations
PGC 44491,[1] DDO 155,[1] GR 8,[1] Imprint of a Foot[1]

GR 8 (also known as UGC 8091) is a gas-rich dwarf irregular galaxy.^[2] In 1995, Tolstoy et al. estimated its distance (with the Hipparcos correction of 1997 applied) to be approximately 7.9 million light-years (5.0×10¹¹ AU) from Earth. It is around 2.8 Mly from UGC 9128.^[3] It is still an open question whether it is a member of the Local Group or possibly the Virgo Cluster.^[4]

GR 8 was discovered at the Lick Observatory using the 20-inch astrograph in either 1946, 1947, or 1951.

References

1. "NASA/IPAC Extragalactic Database". Results for UGC 8091. Retrieved 2007-03-15.
2. Tolstoy, Eline (1999). "Detailed Star-Formation Histories of Nearby Dwarf Irregular Galaxies using HST". In Patricia Whitelock; Russell Cannon (eds.). The stellar content of Local Group galaxies, Proceedings of the 192nd symposium of the International Astronomical Union. Vol. 192. Astronomical Society of the Pacific. p. 218. Bibcode:1999IAUS..192..218T. ISBN 1886733821.
3. Aparicio, A.; Tikhonov, N.; Karachentsev, I. (1999). "Aparicio, Tikhonov, & Karachentsev, DDO 187". arXiv:astro-ph/9909493. doi:10.1086/301157. S2CID 15309075. Retrieved 8 August 2021. {{cite journal}}: Cite journal requires |journal= (help)
4. "GR 8". spider.seds.org. Retrieved 2023-04-30.

External links

• Irregular Galaxy GR 8: Footprint Galaxy
• DDO 155 picture (almost halfway down page)