SR 12 (star)
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 27m 19.51s |
| Declination | −24° 41′ 40.4″ |
| Apparent magnitude (V) | 13.09 to 13.53 |
| Characteristics | |
| Evolutionary stage | T-Tauri binary |
| Spectral type | M3+M8 |
| Variable type | rotational variable |
| Astrometry | |
| Radial velocity (Rv) | -5.648320 ±0.01018 km/s |
| Proper motion (μ) | RA: -7.703 ±1.088 mas/yr Dec.: -25.327 ±0.829 mas/yr |
| Parallax (π) | 8.9034±0.4288 mas |
| Distance | 370 ± 20 ly (112 ± 5 pc) |
| Details | |
| SR 12A | |
| Mass | 0.36+0.16 −0.07 M☉ |
| Radius | 2.0 ±0.3 R☉ |
| Temperature | 3428 K |
| Rotation | 3.4 to 3.6 days |
| Age | 2 Myr |
| SR 12B | |
| Temperature | 2500 K |
| Position (relative to SR 12A) | |
| Component | SR 12B |
| Epoch of observation | 2022.2827 |
| Angular distance | 0.1118 ±1.1″ |
| Position angle | 76.2 ±1.1° |
| Other designations | |
| EM* SR 12, 2MASS J16271951-2441403, ISO-Oph 130, ROX 21, TIC 175629526, V* V2247 Oph, WDS J16273-2442AB | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
SR 12 (also known as V2247 Oph) is a weak-line T-Tauri binary that has a planetary-mass companion with a detected accretion disk.