ADS 7251
 | This article needs additional citations for verification. (June 2020) |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| ADS 7251 A | |
| Right ascension | 09h 14m 22.7749s[1] |
| Declination | 52° 41′ 11.792″[1] |
| Apparent magnitude (V) | 7.64[citation needed] |
| ADS 7251 B | |
| Right ascension | 09h 14m 24.6828s[2] |
| Declination | 52h 41m 10.902s[2] |
| Apparent magnitude (V) | 7.71[citation needed] |
| Characteristics | |
| ADS 7251 A (HD 79210) | |
| Spectral type | K7V |
| Apparent magnitude (B) | 9.06 |
| Apparent magnitude (R) | 6.8 |
| Apparent magnitude (I) | 6.0 |
| Apparent magnitude (J) | 4.89 |
| Apparent magnitude (H) | 3.99 |
| Apparent magnitude (K) | 3.99 |
| B−V color index | 1.42 |
| V−R color index | 0.84 |
| R−I color index | 0.8 |
| J−H color index | 0.90 |
| ADS 7251 B (HD 79211) | |
| Spectral type | M0V |
| Apparent magnitude (B) | 9.14 |
| Apparent magnitude (R) | 6.8 |
| Apparent magnitude (I) | 6.0 |
| Apparent magnitude (J) | 4.78 |
| Apparent magnitude (H) | 4.04 |
| Apparent magnitude (K) | 4.14 |
| B−V color index | 1.43 |
| V−R color index | 0.91 |
| R−I color index | 0.8 |
| J−H color index | 0.74 |
| Variable type | Flare star |
| Astrometry | |
| ADS 7251 A (HD 79210) | |
| Radial velocity (Rv) | 11.245±0.0007[1] km/s |
| Proper motion (μ) | RA: −1,545.787±0.018[1] mas/yr Dec.: −569.053±0.018[1] mas/yr |
| Parallax (π) | 157.8879 ± 0.0197 mas[1] |
| Distance | 20.657 ± 0.003 ly (6.3336 ± 0.0008 pc) |
| Absolute magnitude (MV) | 8.69 |
| ADS 7251 B | |
| Radial velocity (Rv) | 12.104±0.0008[2] km/s |
| Proper motion (μ) | RA: −1,573.040±0.018[2] mas/yr Dec.: −659.906±0.018[2] mas/yr |
| Parallax (π) | 157.8825 ± 0.0211 mas[2] |
| Distance | 20.658 ± 0.003 ly (6.3338 ± 0.0008 pc) |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
ADS 7251 is a binary star system 6.33 parsecs (20.66 light years) from the Sun. The components are of nearly equal brightness. ADS 7251 A, which is 0.06 magnitudes (1.2 times) brighter than ADS 7251 B, is a red dwarf of spectral type K7V. ADS 7251 B, the fainter component, is of spectral type M0V.
Planetary system
ADS 7251 B also known as Gliese 338B or HD 79211, is orbited by one known super-Earth planet detected by radial velocity.[3]
| 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 |
— | — |
References
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ 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. arXiv:2003.13052. Bibcode:2020A&A...637A..93G. doi:10.1051/0004-6361/201937050. ISSN 0004-6361.
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