HD 195019
HD 195019 (HIP 100970, SAO 106138) is a star system in the constellation of Delphinus. Star B is located at projected separation of 131 AU from Star A. This star system is located 123 light-years (38 parsecs) away from the Sun, Earth and Solar System. HD 195019 A is a yellow dwarf or subgiant [G3IV-V]. Star HD 195019 B, detected by spectrometry, was initially believed to be a smaller and dimmer orange dwarf of the K3 type,[5] although later (2003) research failed to detect any stellar companion.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 28m 18.6367s[1] |
| Declination | +18° 46′ 10.1799″[1] |
| Apparent magnitude (V) | 6.91 |
| Characteristics | |
| Spectral type | G3IV-V + K3(disputed) |
| Astrometry | |
| Radial velocity (Rv) | -91.28 km/s |
| Proper motion (μ) | RA: 349.644±0.058[1] mas/yr Dec.: −56.571±0.059[1] mas/yr |
| Parallax (π) | 26.5188 ± 0.0467[1] mas |
| Distance | 123.0 ± 0.2 ly (37.71 ± 0.07 pc) |
| Orbit | |
| Primary | HD 195019A |
| Companion | HD 195019B (disputed) |
| Semi-major axis (a) | 131 AU |
| Details[2][3] | |
| HD 195019A | |
| Mass | 1.06 M☉ |
| Luminosity | 2.24 L☉ |
| Surface gravity (log g) | 4.113 cgs |
| Temperature | 5768.0 K |
| Metallicity [Fe/H] | 0.039 dex |
| Rotational velocity (v sin i) | 1.16 km/s |
| HD 195019B (disputed)[4] | |
| Mass | 0.7 (or <0.25) M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Planetary system
In 1998, a planet was discovered at Lick Observatory utilizing a radial velocity method, orbiting around Star HD 195019 A.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >3.69 ± 0.30 MJ | 0.1388 ± 0.0080 | 18.20132 ± 0.00039 | 0.0138 ± 0.0044 | — | — |
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Quarles, Billy; Li, Gongjie; Kostov, Veselin; Haghighipour, Nader (2020), "Orbital stability of circumstellar planets in binary systems", The Astronomical Journal, 159 (3): 80, arXiv:1912.11019, doi:10.3847/1538-3881/ab64fa, S2CID 209444271
- Precise Differential Analysis of Stellar Metallicities: Application to Solar Analogs Including 16 Cyg A and B
- Long baseline interferometric observations of HD 195019: no K dwarf companion detected
- http://stars.astro.illinois.edu/sow/hd195019.html
- Fischer, Debra A.; et al. (1999). "Planetary Companions around Two Solar-Type Stars: HD 195019 and HD 217107". Publications of the Astronomical Society of the Pacific. 111 (755): 50–56. arXiv:astro-ph/9810420. Bibcode:1999PASP..111...50F. doi:10.1086/316304. S2CID 17980987.
- Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. S2CID 119067572.
External links
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