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] |
Distance | 17.374 ± 0.005
ly (5.327 ± 0.001 pc) |
Absolute bolometric magnitude (Mbol) | 12.81 [2] |
Details [2] | |
Mass | 0.090±0.010 M☉ |
Luminosity | 0.000603 L☉ |
Temperature | 2621±100 K |
Other designations | |
Database references | |
SIMBAD | data |
Location of 2M1540 in the constellation
Norma |
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]
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 2MASS– WISE 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]
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] |
Distance | 17.374 ± 0.005
ly (5.327 ± 0.001 pc) |
Absolute bolometric magnitude (Mbol) | 12.81 [2] |
Details [2] | |
Mass | 0.090±0.010 M☉ |
Luminosity | 0.000603 L☉ |
Temperature | 2621±100 K |
Other designations | |
Database references | |
SIMBAD | data |
Location of 2M1540 in the constellation
Norma |
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]
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 2MASS– WISE 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]