 Ross 19A (bright star) and Ross 19B (marked with a blue cross-hair) Credit: NASA WISE & unWISE (Meisner et al. 2022) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Triangulum |
| Ross 19A | |
| Right ascension | 02h 19m 03.0092s |
| Declination | +35° 21′ 18.601″ |
| Apparent magnitude (V) | 12.70[1] |
| Ross 19B | |
| Right ascension | 02h 19m 48.68s |
| Declination | +35° 18′ 45.3″ |
| Characteristics | |
| Evolutionary stage | red dwarf + brown dwarf |
| Spectral type | M3.5[1] + T9-Y0[2] |
| Astrometry | |
| Ross 19A | |
| Radial velocity (Rv) | −27.80 ± 0.14 km/s |
| Proper motion (μ) | RA: 670.532 ± 0.042 mas/yr[3] Dec.: −427.412 ± 0.040 mas/yr[3] |
| Parallax (π) | 57.3276 ± 0.0398 mas[3] |
| Distance | 56.89 ± 0.04 ly (17.44 ± 0.01 pc) |
| Ross 19B | |
| Proper motion (μ) | RA: 673.2 ± 46.4 mas/yr[3] Dec.: −504.4 ± 57.0 mas/yr[3] |
| Distance | 17.58 ± 3.75[3] pc |
| Details[3] | |
| Ross 19A | |
| Mass | 0.362 ± 0.007 M☉ |
| Radius | 3.38 ± 0.03 RJup |
| Temperature | 3481 ± 49 K |
| Metallicity [Fe/H] | −0.40 ± 0.12 dex |
| Age | 7.2+3.8 −3.6 Gyr |
| Ross 19B | |
| Mass | 15–40 MJup |
| Temperature | 500+115 −100 K |
| Position (relative to Ross 19A)[3] | |
| Component | Ross 19B |
| Angular distance | 568″ |
| Projected separation | 9900 AU |
| Other designations | |
| Ross 19B: CWISE J021948.68+351845.3 | |
| Database references | |
| Ross 19A | |
| SIMBAD | data |
| Ross 19B | |
| SIMBAD | data |
Ross 19 is a red dwarf of spectral type M3.5.[1] In 2021 it was discovered that Ross 19 has a companion, which is a cold brown dwarf. Ross 19B is likely the coldest brown dwarf found around a main-sequence star, as of July 2024.[3]
- ^ a b c Cite error: The named reference
Bidelman1985was invoked but never defined (see the help page). - ^ Cite error: The named reference
Meisner2024was invoked but never defined (see the help page). - ^ a b c d e f g Cite error: The named reference
Schneider21was invoked but never defined (see the help page).