Astronomy:Draco II

From HandWiki
Draco II / Laevens 4
Photograph of the Draco II satellite galaxy.
Observation data (J2000 epoch)
ConstellationDraco
Right ascension 15h 52m 47.6s[1]
Declination+64° 33′ 55″[1]
Distance70.1±1.3 kly
(21.5±0.4 kpc)[2]
Absolute magnitude (V)−0.8+0.4
−1[2]
Characteristics
TypedSph
Mass/Light ratio2.7+0.5
−0.8[3] M☉/L☉
Size324 ly
Other designations
Lae 4, Dra II

Draco II / Leavens 4 is a dwarf satellite galaxy orbiting the Milky Way discovered by the Pan-STARRS1 3π survey in 2015.[3] Currently, it is both one of the nearest and dimmest galaxies known to astronomers. Analysis of its stars' distribution in color–magnitude space show that Draco II is approximately 13.5 billion years old.[2]

References

  1. ↑ 1.0 1.1 "NAME Draco II". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Draco+II. 
  2. ↑ 2.0 2.1 2.2 Longeard, Nicolas; Martin, Nicolas; Starkenburg, Else; Ibata, Rodrigo A; Collins, Michelle L M; Geha, Marla; Laevens, Benjamin P M; Rich, R Michael et al. (2018-10-21). "Pristine dwarf galaxy survey – I. A detailed photometric and spectroscopic study of the very metal-poor Draco II satellite". Monthly Notices of the Royal Astronomical Society 480 (2): 2609–2627. doi:10.1093/mnras/sty1986. ISSN 0035-8711. https://academic.oup.com/mnras/article/480/2/2609/5060758. 
  3. ↑ 3.0 3.1 Martin, Nicolas F.; Geha, Marla; Ibata, Rodrigo A.; Collins, Michelle L. M.; Laevens, Benjamin P. M.; Bell, Eric F.; Rix, Hans-Walter; Ferguson, Annette M. N. et al. (2016-03-01). "Is Draco II one of the faintest dwarf galaxies? First study from Keck/DEIMOS spectroscopy". Monthly Notices of the Royal Astronomical Society: Letters 458 (1): L59–L63. doi:10.1093/mnrasl/slw013. ISSN 1745-3925. https://academic.oup.com/mnrasl/article/458/1/L59/2589548. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Draco_II&oldid=3926998"