Astronomy:Crater 2 Dwarf Galaxy

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Crater 2
Observation data (J2000.0 epoch)
ConstellationCrater[1]
Right ascension 11h 49m 14.400s
177.310°±0.03°[1]
Declination−18° 24′ 46.80″
−18.413°±0.03°[1]
Distance383,000 ly (117.5 kpc)[1]
Apparent magnitude (V)20.35±0.02 mag[1]
Absolute magnitude (V)−8.2±0.1 mag[1]
Characteristics
TypedSph[1]
Apparent size (V)62.4′ (rh=31.2′ ± 2.5′)[1]
6,950 ly (2,132 pc)
rh=1066pc ± 84pc[1]
Notable features4th largest satellite
galaxy to Milky Way[1]

Crater 2 is a dwarf galaxy discovered orbiting the Milky Way,[1] located approximately 380,000 ly from Earth.[2] Crater 2 was identified in imaging data from the VST ATLAS survey.[2]

The galaxy has a half-light radius of ∼1100 pc, making it the fourth largest satellite of the Milky Way.[1] It has an angular size about double of that of the moon.[2][3]

See also

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Torrealba, G.; Koposov, S. E.; Belokurov, V.; Irwin, M. (2016). "The feeble giant. Discovery of a large and diffuse Milky Way dwarf galaxy in the constellation of Crater". Monthly Notices of the Royal Astronomical Society 459 (3): 2370-2378. doi:10.1093/mnras/stw733. Bibcode: 2016MNRAS.459.2370T. 
  2. ↑ 2.0 2.1 2.2 Croswell, K. (14 April 2016). "Never-before-seen galaxy spotted orbiting the Milky Way". New Scientist. https://www.newscientist.com/article/2084438-never-before-seen-galaxy-spotted-orbiting-the-milky-way/. Retrieved 14 April 2016. 
  3. ↑ "Elusive Dwarf Galaxy Found Orbiting Our Milky Way". Huffington Post. http://www.huffingtonpost.com/entry/dwarf-galaxy-crater-2_us_57110c70e4b06f35cb6f5d5f. Retrieved 2016-04-19. 




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