2MASS J154043.42-510135.7

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
SIMBADdata

2MASS J154043.42−510135.7 (2M1540) is a red dwarf of spectral type M7, located in Norma at approximately 15 light-years from Earth. It was discovered in 2014. It is the nearest known M7 dwarf.[1]

Discovery

Its discovery was announced in 2014 by Kirkpatrick et al.[2] and independently by Pérez Garrido et al.[1]

Kirkpatrick and colleagues found a few thousand 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 were 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 the trigonometric distance of 2M1540 agreed with its spectrophotometric distances, computed for a single object, it was concluded that it is not an equal-mass binary.[1]

References

  1. 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.
  2. 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.
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