HD 162020

HD 162020 is an orange dwarf star in Scorpius constellation with a brown dwarf companion.

HD 162020

Observation data Epoch J2000      Equinox J2000
Constellation	Scorpius
Right ascension	17^h 50^m 38.3562^s[1]
Declination	−40° 19′ 06.066″[1]
Apparent magnitude (V)	9.12[2]
Characteristics
Spectral type	K3V[2]
Astrometry
Proper motion (μ)	RA: 19.057±0.140[1] mas/yr Dec.: −26.278±0.101[1] mas/yr
Parallax (π)	32.52 ± 0.24[1] mas
Distance	100.3 ± 0.7 ly (30.8 ± 0.2 pc)
Details[3]
Mass	0.75 M☉
Surface gravity (log g)	4.76±0.25 cgs
Temperature	4830±80 K
Metallicity [Fe/H]	0.01±0.11 dex
Rotational velocity (v sin i)	1.9 km/s
Other designations
CD−40 11894, HIP 87330[2]
Database references
SIMBAD	data
Exoplanet Archive	data

HD 162020 b

HD 162020 b

Discovery
Discovered by	Udry et al.
Discovery date	April 15, 2000[4]
Detection method	Doppler Spectroscopy
Orbital characteristics
Semi-major axis	00,751 AU (1.123×10^11 km)
Eccentricity	0.277 ± 0.02
Orbital period	8.428198 ± 0.000056 d
Time of periastron	2451990.6768 ± 0.0050
Argument of periastron	28.40 ± 0.23
Semi-amplitude	1813 ± 4
Physical characteristics
Mass	>15.0 MJ

HD 162020 b is a brown dwarf with mass 15.0 M_J. The mass is minimum since inclination is not known. This planetar orbits very close to the star at a distance of 0.075 AU. Despite of this, it has an eccentric orbit of 27.7%. The distance from the star ranges from 0.054 to 0.096 AU. It has an extremely high semi-amplitude of 1.813 km/s. The discovery was announced on April 15, 2000 by the Geneva Extrasolar Planet Search Team.[4][3]

References

1. Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
2. "HD 162020". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-02.
3. Udry, M.; et al. (2002). "The CORALIE survey for southern extra-solar planets VIII. The very low-mass companions of HD 141937, HD 162020, HD 168443, HD 202206: Brown dwarfs or "superplanets"?". Astronomy and Astrophysics. 390 (1): 267–279. arXiv:astro-ph/0202458. Bibcode:2002A&A...390..267U. doi:10.1051/0004-6361:20020685.
4. "Exoplanets Galore!" (Press release). Garching, Germany: European Southern Observatory. April 15, 2000. Retrieved December 30, 2012.

External links

• "Notes for star HD 162020". The Extrasolar Planets Encyclopaedia. Retrieved December 21, 2007.
• "Notes for planet HD 162020 b". The Extrasolar Planets Encyclopaedia. Retrieved December 21, 2007.