2MASS J15404342−5101357

2MASS J15404341−5101357 (abbreviated 2M1540) is a red dwarf of spectral type M7, located in Norma at approximately 17 light-years from Earth. It is the nearest known M7 dwarf.[2]

2MASS J15404341−5101357
Observation data
Epoch J2000      Equinox J2000
Constellation Norma
Right ascension 15h 40m 43.537s[1]
Declination −51° 01′ 35.968″[1]
Apparent magnitude (V) 15.26[2]
Characteristics
Evolutionary stage main-sequence star[2]
Spectral type M7V[2]
Apparent magnitude (J) 8.96[3]
Astrometry
Radial velocity (Rv)50.0[3] km/s
Proper motion (μ) RA: +1.954[2] mas/yr
Dec.: −0.330[2] mas/yr
Parallax (π)187.7290 ± 0.0496 mas[4]
Distance17.374 ± 0.005 ly
(5.327 ± 0.001 pc)
Absolute bolometric
magnitude
 (Mbol)
12.81[2]
Details[2]
Mass0.090±0.010 M
Luminosity0.000603 L
Temperature2621±100 K
Other designations
GJ 12259,[5] 2MASS J154043.42-510135.7, WISEA J154045.67-510139.3, UCAC4 195-119117, Gaia DR2 5985290231327158144
Database references
SIMBADdata
2M1540 is located in the constellation Norma
2M1540 is located in the constellation Norma
2M1540
Location of 2M1540 in the constellation Norma

Discovery

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Its discovery was announced in 2014 by Kirkpatrick et al.[6] and independently by Pérez Garrido et al.[2]

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.[6]

Pérez Garrido and colleagues were looking for high proper motion sources in the 2MASSWISE cross-match. They named it 2MASS J154043.42-510135.7 (2M1540 for short) and classified it as an M7.0±0.5 dwarf.[2]

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.[2]

References

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  1. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. ^ a b c d e f g h i j k 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. S2CID 118704532.
  3. ^ a b Henry, Todd J.; Jao, Wei-Chun; Winters, Jennifer G.; Dieterich, Sergio B.; Finch, Charlie T.; Ianna, Philip A.; Riedel, Adric R.; Silverstein, Michele L.; Subasavage, John P.; Vrijmoet, Eliot Halley (2018), "The Solar Neighborhood XLIV: RECONS Discoveries within 10 parsecs", The Astronomical Journal, 155 (6): 265, arXiv:1804.07377, Bibcode:2018AJ....155..265H, doi:10.3847/1538-3881/aac262, S2CID 53983430
  4. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. ^ Golovin, Alex; Reffert, Sabine; Just, Andreas; Jordan, Stefan; Vani, Akash; Jahreiß, Hartmut (November 2022). "The Fifth Catalogue of Nearby Stars (CNS5)". Astronomy & Astrophysics. 670: A19. arXiv:2211.01449. Bibcode:2023A&A...670A..19G. doi:10.1051/0004-6361/202244250. S2CID 253264922. Catalogue can be accessed here.
  6. ^ a b 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. S2CID 30949660.