BD-21 784
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Coordinates: 
04h 06m 34.8414s, −20° 51′ 11.2259″
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 06m 34.8414s[1] |
| Declination | −20° 51′ 11.2259″[1] |
| Apparent magnitude (V) | 9.675 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | M0V[2] or K7[3] |
| B−V color index | 1.206[4] |
| Astrometry | |
| Radial velocity (Rv) | 25.068±0.111[5] km/s |
| Proper motion (μ) | RA: 52.803[6] mas/yr Dec.: -778.887[6] mas/yr |
| Parallax (π) | 38.6445 ± 0.0173[6] mas |
| Distance | 84.40 ± 0.04 ly (25.88 ± 0.01 pc) |
| Details | |
| Mass | 0.69[2] M☉ |
| Radius | 0.659±0.047[7] R☉ |
| Luminosity | 0.1372±0.0022[3] L☉ |
| Surface gravity (log g) | 4.68±0.04[7] cgs |
| Temperature | 4298±200[7] K |
| Metallicity [Fe/H] | -0.26±0.08[8] dex |
| Age | 1.1-10[7][9] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
BD-21 784, also known as Gliese 160.2, Gliese 9144, LHS 1628 or HIP 19165 is a K-type main-sequence star located 84.4 light-years away in the constellation of Eridanus. Its surface temperature is 4300 K.[3] The star's concentration of heavy elements is low, with concentration of iron just 55% of the Sun`s.[8] The age of BD-21 784 is poorly constrained to range from 1.1 to 10 billion years,[7] but may be similar to that of the Sun.[9]
Planetary system[edit]
In 2014 one planet, named Gliese 160.2 b, was announced on a 5.2-day orbit, discovered by the radial velocity method.[10] The planetary equilibrium temperature is 736±43 K.[3] The existence of the planet was refuted with the expanded radial-velocity dataset in 2020 though.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| Gliese 160.2 b (refuted) | > 10.2+7.2 −4.1 M⊕ |
0.053+0.004 −0.007 |
5.2354+0.0027 −0.0065 |
— | — | >3.10 R⊕ |
References[edit]
- ↑ 1.0 1.1 1.2 "BD-21 784". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-04-27.
- ↑ 2.0 2.1 2.2 Feng, Fabo; Butler, R. Paul; Shectman, Stephen A.; Crane, Jeffrey D.; Vogt, Steve; Chambers, John; Jones, Hugh R. A.; Wang, Sharon Xuesong; Teske, Johanna K.; Burt, Jenn; Díaz, Matías R.; Thompson, Ian B. (2020). "Search for Nearby Earth Analogs. II. Detection of Five New Planets, Eight Planet Candidates, and Confirmation of Three Planets around Nine Nearby M Dwarfs". The Astrophysical Journal Supplement Series. 246 (1): 11. arXiv:2001.02577. Bibcode:2020ApJS..246...11F. doi:10.3847/1538-4365/ab5e7c. Unknown parameter
|s2cid=ignored (help) - ↑ 3.0 3.1 3.2 3.3 3.4 Martínez-Rodríguez, Héctor; Caballero, José Antonio; Cifuentes, Carlos; Piro, Anthony L.; Barnes, Rory (2019). "Exomoons in the Habitable Zones of M Dwarfs". The Astrophysical Journal. 887 (2): 261. arXiv:1910.12054. Bibcode:2019ApJ...887..261M. doi:10.3847/1538-4357/ab5640. Unknown parameter
|s2cid=ignored (help) - ↑ Wright, J. T.; Marcy, G. W.; Butler, R. Paul; Vogt, S. S. (2004), "Chromospheric Ca ii Emission in Nearby F, G, K, and M Stars", The Astrophysical Journal Supplement Series, 152 (2): 261–295, arXiv:astro-ph/0402582, Bibcode:2004ApJS..152..261W, doi:10.1086/386283 Unknown parameter
|s2cid=ignored (help) - ↑ Chubak, C.; Marcy, G.; Fischer, D. A.; Howard, A. W.; Isaacson, H.; Johnson, J. A.; Wright, J. T. (2012), PRECISE RADIAL VELOCITIES OF 2046 NEARBY FGKM STARS AND 131 STANDARDS, arXiv:1207.6212
- ↑ 6.0 6.1 6.2 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. Unknown parameter
|s2cid=ignored (help) Gaia EDR3 record for this source at VizieR. - ↑ 7.0 7.1 7.2 7.3 7.4 Yee, Samuel W.; Petigura, Erik A.; von Braun, Kaspar (2017), "Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library", The Astrophysical Journal, 836 (1): 77, arXiv:1701.00922, Bibcode:2017ApJ...836...77Y, doi:10.3847/1538-4357/836/1/77 Unknown parameter
|s2cid=ignored (help) - ↑ 8.0 8.1 Sousa, S. G.; Adibekyan, V.; Delgado-Mena, E.; Santos, N. C.; Andreasen, D. T.; Ferreira, A. C. S.; Tsantaki, M.; Barros, S. C. C.; Demangeon, O.; Israelian, G.; Faria, J. P.; Figueira, P.; Mortier, A.; Brandão, I.; Montalto, M.; Rojas-Ayala, B.; Santerne, A. (2018), "SWEET-Cat updated", Astronomy & Astrophysics, 620: A58, arXiv:1810.08108, doi:10.1051/0004-6361/201833350 Unknown parameter
|s2cid=ignored (help) - ↑ 9.0 9.1 Ghaffari, Mohsen; Lengler, Johannes (2017), HAZMAT II: Ultraviolet Variability of Low-Mass Stars in the GALEX Archive, arXiv:1705.03583
- ↑ Tuomi, Mikko; Jones, Hugh R. A.; Barnes, John R.; Anglada-Escudé, Guillem; Jenkins, James S. (2014). "Bayesian search for low-mass planets around nearby M dwarfs – estimates for occurrence rate based on global detectability statistics". Monthly Notices of the Royal Astronomical Society. 441 (2): 1545–1569. arXiv:1403.0430. doi:10.1093/mnras/stu358.
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