16h26m28.0400s, −25° 26′ 47.7168″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h26m 28.0400s[1] |
| Declination | −25° 26′ 47.7168″[1] |
| Apparent magnitude (V) | 14.29 |
| Characteristics | |
| Evolutionary stage | pre-main-sequence star |
| Spectral type | M0e[1] |
| Astrometry | |
| Proper motion (μ) | RA: -6.858[2] mas/yr Dec.: -24.815[2] mas/yr |
| Parallax (π) | 7.2170 ± 0.0172 mas[2] |
| Distance | 452 ± 1 ly (138.6 ± 0.3 pc) |
| Details[3] | |
| 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 | |
| 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 | |
ROXs 12 is a binary system of pre-main-sequence stars. It belongs to the Rho Ophiuchi cloud complex.[4] The surface temperature of the primary star is 3900±100 K.[3] ROXs 12 is much younger than the Sun with an age of 7.6+4.1
−2.5 million years.[4]
A multiplicity survey detected a stellar companion to ROXs 12 in 2017, named 2MASS J16262774–2527247,[5] at a projected separation of 5100 AU.[6]
In 2005, one planet was discovered on a wide orbit by direct imaging,[7] was confirmed in 2013 and named ROXs 12 b.[4] The planet's measured temperature is 3100+400
−500 K.[6]
The primary star is surrounded by a protoplanetary disk, although it is not very massive, being less than 4 MJ.[4] The secondary star also has a protoplanetary disk, and it is much more massive, equal to 10-1.07+0.49
−0.87M☉. The disk is inclined to the equatorial plane of the star.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| Protoplanetary or debris disk | ?AU | — | — | |||
| b [fr] | 16±4 MJ | 210±20 | — | ~0 | — | — |
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| Protoplanetary disk | 4.1–25.8[5] AU | — | — | |||
