Ross 458
Image of Ross 458 with the legacy surveys. The companion is the red object marked with an crosshair in the lower right. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 13h 00m 46.557s |
| Declination | +12° 22′ 32.68″ |
| Apparent magnitude (V) | 9.79 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M0.5 + M7.0 |
| U−B color index | 1.12 |
| B−V color index | 1.44 |
| Astrometry | |
| Radial velocity (Rv) | −12.33±0.32 km/s |
| Proper motion (μ) | RA: −628.7±0.184 mas/yr Dec.: −33.5±0.133 mas/yr |
| Parallax (π) | 86.9010±0.1170 mas |
| Distance | 37.53 ± 0.05 ly (11.51 ± 0.02 pc) |
| Absolute magnitude (MV) | +9.47 |
| Orbit | |
| Primary | A |
| Name | B |
| Period (P) | 13.63±0.03 yr |
| Semi-major axis (a) | 4.93±0.01 AU |
| Eccentricity (e) | 0.245±0.001 |
| Inclination (i) | 130.3±0.3° |
| Longitude of the node (Ω) | 56.25±0.17° |
| Periastron epoch (T) | 2007.67±0.02 |
| Argument of periastron (ω) (secondary) | 157.5±0.6° |
| Details | |
| A | |
| Mass | 0.553±0.007 M☉ |
| Radius | 0.601±0.001 R☉ |
| Luminosity | 0.044+0.016 −0.012 L☉ |
| Surface gravity (log g) | 4.648+0.001 −0.002 cgs |
| Temperature | 3,661.2+2.6 −2.5 K |
| Metallicity [Fe/H] | +0.09±0.10 dex |
| Rotation | 2.89 d |
| Rotational velocity (v sin i) | 9.6±0.9 km/s |
| Age | 400–800 Myr |
| B | |
| Mass | 88.9+1.8 −2.8 MJup |
| C | |
| Mass | 8.24+0.80 −0.75 MJup |
| Radius | 0.85±0.02 RJup |
| Luminosity | 5.37+0.08 −0.06×10−6 L☉ |
| Surface gravity (log g) | 4.12±0.04 cgs |
| Temperature | 771+7 −8 K |
| Metallicity | = 0.05+0.03 −0.02 |
| Other designations | |
| DT Vir, BD+13°2618, GJ 494, HIP 63510, LHS 2665, LTT 13752, Ross 458, Wolf 462 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
![{\displaystyle {\begin{smallmatrix}\left[{\mathrm {M} }/{\mathrm {H} }\right]\end{smallmatrix}}}](./_assets_/eb734a37dd21ce173a46342d1cc64c92/d9a106d03666c72cc54c1dff07a5637d3adda9a1.svg)
Ross 458, also referred to as DT Virginis, is a binary star system in the constellation of Virgo. It has an apparent visual magnitude of 9.79 and is located at a distance of 37.6 light-years from the Sun. Both of the stars are low-mass red dwarfs with at least one of them being a flare star. This binary system has a circumbinary sub-stellar companion.