Draco II
| Draco II / Laevens 4 | |
|---|---|
 Photograph of the Draco II satellite galaxy. | |
| Observation data (J2000 epoch) | |
| Constellation | Draco |
| Right ascension | 15h 52m 47.6s[1] |
| Declination | +64° 33′ 55″[1] |
| Distance | 70.1±1.3 kly (21.5±0.4 kpc)[2] |
| Absolute magnitude (V) | −0.8+0.4 −1[2] |
| Characteristics | |
| Type | dSph |
| Mass/Light ratio | 2.7+0.5 −0.8[3] M☉/L☉ |
| Size | 324 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
- ^ a b "NAME Draco II". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-04-07.
- ^ a b c Longeard, Nicolas; Martin, Nicolas; Starkenburg, Else; Ibata, Rodrigo A; Collins, Michelle L M; Geha, Marla; Laevens, Benjamin P M; Rich, R Michael; Aguado, David S; Arentsen, Anke; Carlberg, Raymond G; Côté, Patrick; Hill, Vanessa; Jablonka, Pascale; González Hernández, Jonay I (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. arXiv:1807.10655. doi:10.1093/mnras/sty1986. ISSN 0035-8711.
- ^ a b 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.; Chambers, Kenneth C.; Wainscoat, Richard J.; Waters, Christopher (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. arXiv:1510.01326. doi:10.1093/mnrasl/slw013. ISSN 1745-3925.
| Location | Milky Way → Milky Way subgroup → Local Group → Local Sheet → Local Volume → Virgo Supercluster → Laniakea Supercluster → Pisces–Cetus Supercluster Complex → Local Hole → Observable universe → Universe Each arrow (→) may be read as "within" or "part of". | _ESA512394_-_slider.jpg) | |||||
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