ROXs 12
ROXs 12 is a binary system of pre-main-sequence stars. It belongs to the Rho Ophiuchi cloud complex. The surface temperature of the primary star is 3900±100 K. ROXs 12 is much younger than the Sun with an age of 7.6+4.1
−2.5 million years.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 26m 28.0400s |
| Declination | −25° 26′ 47.7168″ |
| Apparent magnitude (V) | 14.29 |
| Characteristics | |
| Evolutionary stage | pre-main-sequence star |
| Spectral type | M0e |
| Astrometry | |
| Proper motion (μ) | RA: -6.858 mas/yr Dec.: -24.815 mas/yr |
| Parallax (π) | 7.2170 ± 0.0172 mas |
| Distance | 452 ± 1 ly (138.6 ± 0.3 pc) |
| Details | |
| ROXs 12 | |
| Mass | 0.65+0.05 −0.09 M☉ |
| Radius | 1.14±0.07 R☉ |
| Temperature | 3900±100 K |
| Rotation | 9.1±0.4 d |
| Age | 7.6+4.1 −2.5 Myr |
| 2MASS J16262774–2527247 | |
| Mass | 0.535+0.006 −0.007 M☉ |
| Radius | 1.17+0.06 −0.04 R☉ |
| Luminosity | 0.24+0.05 −0.04 L☉ |
| Surface gravity (log g) | 3.6+0.6 −0.7 cgs |
| Temperature | 3746+139 −122 K |
| Other designations | |
WDS J16265-2527 | |
| ROXs 12: 2MASS J16262803-2526477, DENIS J162628.0-252647 | |
| 2MASS J16262774–2527247: DENIS J162627.7-252724 | |
| Database references | |
| SIMBAD | ROXs 12 |
| ROXs 12b | |
| 2MASS J16262774–2527247 | |
A multiplicity survey detected a stellar companion to ROXs 12 in 2017, named 2MASS J16262774–2527247, at a projected separation of 5100 AU.
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