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]

HD 195019
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 mas[1]
Distance123.0 ± 0.2 ly
(37.71 ± 0.07 pc)
Orbit
PrimaryHD 195019A
CompanionHD 195019B (disputed)
Semi-major axis (a)131 AU
Details[2][3]
HD 195019A
Mass1.06 M
Luminosity2.24 L
Surface gravity (log g)4.113 cgs
Temperature5768.0 K
Metallicity [Fe/H]0.039 dex
Rotational velocity (v sin i)1.16 km/s
HD 195019B (disputed)[4]
Mass0.7 (or <0.25) M
Other designations
BD+18° 4505, GCRV 12790, HD 195019 HIP 100970, LTT 15981, NLTT 49312, SAO 106138, 2MASS J20281860+1846103, Gaia DR2 1815418118373631360
Database references
SIMBADdata

Planetary system

In 1998, a planet was discovered at Lick Observatory utilizing a radial velocity method, orbiting around Star HD 195019 A.[6]

The HD 195019 planetary system[7]
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

See also

References

  1. 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.
  2. 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, Bibcode:2020AJ....159...80Q, doi:10.3847/1538-3881/ab64fa, S2CID 209444271
  3. Precise Differential Analysis of Stellar Metallicities: Application to Solar Analogs Including 16 Cyg A and B
  4. Long baseline interferometric observations of HD 195019: no K dwarf companion detected
  5. "HD 195019 Delphini".
  6. 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.
  7. 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.
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