ADS 7251
ADS 7251 is a binary star system 6.16 ±0.02 parsecs (20.09 ±0.07 light years) from the Sun. Both are of nearly equal brightness, but ADS 7251 A, which is 0.06 magnitudes (1.2 times) brighter than ADS 7251 B, is a red dwarf of spectral type M0.0. The latter is spectral type K7.0 and slightly further away.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| ADS 7251 A | |
| Right ascension | 09h 14m 22.79157s |
| Declination | 52° 41′ 11.7206″ |
| Apparent magnitude (V) | 7.64 |
| ADS 7251 B | |
| Right ascension | 09h 14m 24.69574s |
| Declination | 52h 41m 11.0926s |
| Apparent magnitude (V) | 7.71 |
| Characteristics | |
| Spectral type | M0.0 K7.0 |
| Apparent magnitude (B) | 9.06 9.14 |
| Apparent magnitude (V) | 7.64 7.71 |
| Apparent magnitude (R) | 6.8 6.8 |
| Apparent magnitude (I) | 6.0 6.0 |
| Apparent magnitude (J) | 4.89 4.78 |
| Apparent magnitude (H) | 3.99 4.04 |
| Apparent magnitude (K) | 3.99 4.14 |
| B−V color index | 1.42 1.43 |
| V−R color index | 0.84 0.91 |
| R−I color index | 0.8 0.8 |
| J−H color index | 0.90 0.74 |
| Variable type | Flare star |
| Astrometry | |
| ADS 7251 A | |
| Radial velocity (Rv) | 11.14±0.10 km/s |
| Proper motion (μ) | RA: −1555.6±0.9 mas/yr Dec.: −570±1 mas/yr |
| Parallax (π) | 161.59 ± 5.23 mas |
| Distance | 20.2 ± 0.7 ly (6.2 ± 0.2 pc) |
| Absolute magnitude (MV) | 8.69 |
| ADS 7251 B | |
| Radial velocity (Rv) | 12.50±0.10 km/s |
| Proper motion (μ) | RA: −1560.8±0.8 mas/yr Dec.: −660.6±0.9 mas/yr |
| Parallax (π) | 159.48 ± 6.61 mas |
| Distance | 20.5 ± 0.8 ly (6.3 ± 0.3 pc) |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
Planetary system
ADS 7251 B also known as Gliese 338B has one known super-Earth planet detected by radial velocity.[1]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 9.97+1.47 −1.38 M⊕ |
0.141±0.005 | 24.45±0.02 | 0.11+0.11 −0.08 |
— | — |
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See also
- DI Cha
- Star system
References
- González-Álvarez, E.; Osorio, M. R. Zapatero; Caballero, J. A.; Sanz-Forcada, J.; Béjar, V. J. S.; González-Cuesta, L.; Dreizler, S.; Bauer, F. F.; Rodríguez, E.; Tal-Or, L.; Zechmeister, M. (May 2020). "The CARMENES search for exoplanets around M dwarfs. A super-Earth planet orbiting HD 79211 (GJ 338 B)". Astronomy & Astrophysics. 637: A93. doi:10.1051/0004-6361/201937050. ISSN 0004-6361.
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