Loading AI tools
Red dwarf star in the constellation Norma From Wikipedia, the free encyclopedia
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]
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 |
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]
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.