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]:{{{3}}}
Discovery
Discovery of 2M1540 was announced in 2014 by Kirkpatrick et al.[2]:{{{3}}} and independently by Pérez Garrido et al.[1]:{{{3}}}
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]:{{{3}}}
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]:{{{3}}}
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]:{{{3}}}
