Astronomy:Crater 2 Dwarf Galaxy
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Crater 2 | |
---|---|
Observation data (J2000.0 epoch) | |
Constellation | Crater[1] |
Right ascension | 11h 49m 14.400s 177.310°±0.03°[1] |
Declination | −18° 24′ 46.80″ −18.413°±0.03°[1] |
Distance | 383,000 ly (117.5 kpc)[1] |
Apparent magnitude (V) | 20.35±0.02 mag[1] |
Absolute magnitude (V) | −8.2±0.1 mag[1] |
Characteristics | |
Type | dSph[1] |
Apparent size (V) | 62.4′ (rh=31.2′ ± 2.5′)[1] 6,950 ly (2,132 pc) rh=1066pc ± 84pc[1] |
Notable features | 4th 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
- ↑ 1.00 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.
- ↑ 2.0 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.
- ↑ "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.
External links