2MASS J154043.42-510135.7
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Norma |
| Right ascension | 15h 40m 43.42s |
| Declination | –51° 01′ 35.7″ |
| Database references | |
| SIMBAD | data |
2MASS J154043.42−510135.7 (2M1540) is a red dwarf of spectral type M7, located in constellation Norma at approximately 15 light-years from Earth. It was discovered in 2014. It is the nearest known M7 dwarf.[1]
Discovery
Discovery of 2M1540 was announced in 2014 by Kirkpatrick et al.[2] and independently by Pérez Garrido et al.[1]
Kirkpatrick and colleagues found few thousands of new high proper motion objects under the AllWISE program of study of images, taken by Wide-field Infrared Survey Explorer (WISE). 2M1540 was one of these high proper motion objects. They named it WISEA J154045.67-510139.3 and assigned it spectral type M6.[2]
Pérez Garrido and colleagues found this M-type dwarf, looking for high proper motion sources in the 2MASS–WISE cross-match. They named it 2MASS J154043.42−510135.7 (2M1540) and classified it as an M7.0±0.5 dwarf.[1]
Since trigonometric distance of 2M1540 agree with its spectrophotometric distances, computed for single object, it was concluded that it is not an equal-mass binary.[1]
References
- 1 2 3 4 Pérez Garrido, A.; Lodieu, N.; Béjar, V. J. S.; Ruiz, M. T.; Gauza, B.; Rebolo, R.; Zapatero Osorio, M. R. (2014). "2MASS J154043.42-510135.7: a new addition to the 5 pc population". Astronomy & Astrophysics. 567: A6. arXiv:1405.5439
. Bibcode:2014A&A...567A...6P. doi:10.1051/0004-6361/201423615. - 1 2 Kirkpatrick, J. Davy; Schneider, Adam; Fajardo-Acosta, Sergio; Gelino, Christopher R.; Mace, Gregory N.; Wright, Edward L.; Logsdon, Sarah E.; McLean, Ian S.; Cushing, Michael C.; Skrutskie, Michael F.; Eisenhardt, Peter R.; Stern, Daniel; Baloković, Mislav; Burgasser, Adam J.; Faherty, Jacqueline K.; Lansbury, George B.; Rich, J. A.; Skrzypek, Nathalie; Fowler, John W.; Cutri, Roc M.; Masci, Frank J.; Conrow, Tim; Grillmair, Carl J.; McCallon, Howard L.; Beichman, Charles A.; Marsh, Kenneth A. (2014). "The AllWISE Motion Survey and the Quest for Cold Subdwarfs". The Astrophysical Journal. 783 (2): 122. arXiv:1402.0661. Bibcode:2014ApJ...783..122K. doi:10.1088/0004-637X/783/2/122.