2MASS-GC02, also known as Hurt 2, is a globular cluster at a distance of about 16 thousand light-years from Earth in the constellation Sagittarius. It was discovered in 2000 by Joselino Vasquez together with globular cluster 2MASS-GC01 and a spiral galaxy 2MASXI J0730080-220105,[4] and confirmed by a team of astronomers under the leadership of R. J. Hurt at 2MASS.[2]
| 2MASS-GC02 | |
|---|---|
.jpg) 2MASS-GC02, imaged in infrared | |
| Observation data (J2000 epoch) | |
| Class | IV |
| Constellation | Sagittarius |
| Right ascension | 18h 09m 36.5s[1] |
| Declination | −20° 46′ 44″[1] |
| Distance | 16.0 kly (4.9 kpc) |
| Apparent magnitude (V) | 24.60[2] |
| Physical characteristics | |
| Absolute magnitude | −4.86[2] |
| Radius | 0.95′ × 0.95′[2] |
| Metallicity | = −1.08[3] dex |
| Other designations | Hurt 2 |
![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c)
The globular cluster 2MASS-GC02 is not in the visible portion of the electromagnetic spectrum, due to interstellar extinction, but was spotted in infrared light. It is located at a distance of 10.4 thousand light years from the center of the Milky Way.[2] Due to its trajectory, it has a negative radial velocity meaning it is approaching the Solar System, but its radial velocity is unclear. The radial velocity was originally put at −238 km/s,[5] but a newer analysis determined it to be −87 km/s; a 150 km/s difference.[6]
References
edit- ^ a b "NAME 2MASS-GC02". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 January 2017.
- ^ a b c d e "2MASS-GC02, Hurt 2". Retrieved 15 January 2016.
- ^ "A Galactic Globular Clusters Database: NGC 6540". Retrieved 15 January 2017.
- ^ Hurt et al. 2000.
- ^ Baumgardt, H.; Hilker, M.; Sollima, A.; Bellini, A. (2019). "Mean proper motions, space orbits, and velocity dispersion profiles of Galactic globular clusters derived from Gaia DR2 data". Monthly Notices of the Royal Astronomical Society. 482 (4): 5138–5155. arXiv:1811.01507. doi:10.1093/mnras/sty2997.
- ^ Kunder, Andrea; Crabb, Riley E.; Debattista, Victor P.; Koch-Hansen, Andreas J.; Huhmann, Brianna M. (2021). "Spectroscopic Observations of Obscured Populations in the Inner Galaxy: 2MASS-GC02, Terzan 4, and the 200 km s−1 stellar peak". The Astronomical Journal. 162 (3): 86. arXiv:2106.02647. Bibcode:2021AJ....162...86K. doi:10.3847/1538-3881/ac0888. S2CID 235358083.
Further reading
edit- Discovery paper
- Hurt, Robert L.; Jarrett, Tom H.; Kirkpatrick, J. Davy; Cutri, Roc M.; Schneider, Stephen E.; Skrutskie, Mike; Van Driel, Willem (2000). "Serendipitous 2MASS Discoveries near the Galactic Plane: A Spiral Galaxy and Two Globular Clusters". The Astronomical Journal. 120 (4): 1876–1883. arXiv:astro-ph/0006262. Bibcode:2000AJ....120.1876H. doi:10.1086/301549. S2CID 45767385.
External links
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