2MASS J01225093−2439505
M-Type main sequence star in the constellation Cetus
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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 (120 Million years). Kinematically, the star belongs to the AB Doradus moving group.[6]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| 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 | |
| TIC 11614485, 2MASS J01225093−2439505, Gaia DR2 5040416186560252416[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]
| 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 |
