2MASS J01225093−2439505

2MASS J01225093−2439505 is a M-type main-sequence star. Its surface temperature is 3530±50 K. 2MASS J01225093−2439505 is much younger than the Sun at an age of 0.12 billion years. Kinematically, the star belongs to the AB Doradus moving group.^[6]

2MASS J01225093−2439505

Observation data Epoch J2000      Equinox J2000
Constellation	Cetus
Right ascension	01h 22m 50.9353s[1]
Declination	−24° 39′ 50.6933″[1]
Apparent magnitude (V)	14.24±0.07[1]
Characteristics
Evolutionary stage	main-sequence star
Spectral type	M3.5V[2]
Astrometry
Proper motion (μ)	RA: 120.215[3] mas/yr Dec.: −123.561[3] mas/yr
Parallax (π)	29.6409±0.0273 mas[3]
Distance	110.0 ± 0.1 ly (33.74 ± 0.03 pc)
Details
Mass	0.4[4] M☉
Radius	0.369[2] R☉
Luminosity	0.019[2] L☉
Temperature	3530±50[2] K
Rotation	1.49±0.02 d[5]
Age	0.12[citation needed] Gyr
Other designations
Gaia DR2 5040416186560252416, TIC 11614485, 2MASS J01225093−2439505[1]
Database references
SIMBAD	data

Multiplicity surveys did not detect any stellar companions to 2MASS J01225093−2439505 as of 2016.^[7]

Planetary system

In 2013, one superjovian planet (may be a brown dwarf),^[5] named 2MASS J01225093−2439505 b, was discovered by direct imaging.^[2] The measured planetary temperature is 1600±100 K,^[4] and it exhibits an unusual, short-lived atmospheric dust type due to its relatively low surface gravity and young age.^[2] The planetary spectrum is classified as L3.7±1.0.^[4] The planetary rotation axis is inclined to its orbit, obliquity is 33⁺¹⁷
₋₉°, while the orbit is well aligned with the equatorial plane of the star, misalignment is 1⁺²⁸
₋₁°. The planet is rotating rapidly, with a period of 6.8±1.8 hours.^[5]

The 2MASS J01225093−2439505 planetary system^[4]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	19.5±7.5 MJ	50	—	—	103+16 −6[5]°	1.04±0.18[5] RJ