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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, 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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На других языках

[de] HD 195019

HD 195019 ist ein etwa 37 Parsec entferntes Sternsystem im Sternbild Delphin. Es besteht aus zwei Sternen in einem Winkelabstand von 4",1 (ca. 150 AE) mit einem Positionswinkel von 324°. Zudem wird die Hauptkomponente von einem spektroskopischen Begleiter umrundet, bei dem es sich um einen potentiellen Exoplaneten handelt. Der Zentralstern weist eine scheinbare Helligkeit von 6,9 mag auf und gehört zur Spektralklasse G3 IV-V, seine Masse entspricht etwa derjenigen der Sonne.
- [en] HD 195019

[es] HD 195019

HD 195019 (HIP 100970 / SAO 106138 / GC 28482)[1] es una estrella binaria en la constelación del Delfín de magnitud aparente +6,91. Al ser tan tenue no denominación de Bayer ni número de Flamsteed. En 1998 se descubrió un planeta extrasolar alrededor de la estrella principal de este sistema.[2]


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