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  17h 50m 38.3562s[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
Distance100.3 ± 0.7 ly
(30.8 ± 0.2 pc)
Details[3]
Mass0.75 M☉
Surface gravity (log g)4.76±0.25 cgs
Temperature4830±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
SIMBADdata
Exoplanet Archivedata

HD 162020 b
HD 162020 b
Discovery
Discovered byUdry et al.
Discovery dateApril 15, 2000[4]
Doppler Spectroscopy
Orbital characteristics
00,751 AU (1.123×1011 km)
Eccentricity0.277 ± 0.02
8.428198 ± 0.000056 d
2451990.6768 ± 0.0050
28.40 ± 0.23
Semi-amplitude1813 ± 4
Physical characteristics
Mass>15.0 MJ

    HD 162020 b is a brown dwarf with mass 15.0 MJ. 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]

    gollark: I mean, yes, the naming is weird.
    gollark: MLC is two bits a cell, so it has to distinguish *four* voltage levels. This means you get twice the density.
    gollark: SLC flash stores only one bit per cell, so it needs to distinguish two voltage levels.
    gollark: No idea about how it actually gets read/written.
    gollark: The flash cells are analog devices to some extent and can store a voltage rather than just on/off.

    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.
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