HD 162020
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Scorpius |
| Right ascension | 17h 50m 38.3575s |
| Declination | −40º 19' 06.0562″ |
| Apparent magnitude (V) | +9.18 |
| Absolute magnitude (V) | +6.71 |
| Distance | 102.0 ly (31.26 pc) |
| Spectral type | K2V: |
| Other designations | |
HD 162020 is an orange dwarf star in Scorpius constellation with a brown dwarf companion.
[edit] HD 162020 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 00751 AU |
| Eccentricity | (e) | 0.277 ± 0.02 |
| Orbital period | (P) | 8.428198 ± 0.000056 d |
| Angular distance | (θ) | 2.40 mas |
| Longitude of periastron |
(ω) | 28.40 ± 0.23° |
| Time of periastron | (T0) | 2451990.6768 ± 0.0050 JD |
| Semi-amplitude | (K) | 1813 ± 4 m/s |
| Physical characteristics | ||
| Mass | (m) | >15.0 MJ |
| Discovery information | ||
| Discovery date | 2002 | |
| Discoverer(s) | Udry et al. | |
| Detection method | Doppler Spectroscopy | |
| Discovery site | California, United States | |
| Discovery status | Published | |
HD 162020 b is a brown dwarf with mass 28.5 Wg (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 1813 m/s.
In 2002, Stephen Udry discovered HD 162020 b taking place in California. Udry was the same person who discovered two Earth-like planets around Gliese 581.
[edit] References
- Udry et al. (2002). "[http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2002/28/aa2416/aa2416.html The CORALIE survey for southern extra-solar planets
VIII. The very low-mass companions of HD 141937 , HD 162020 , HD 168443 and HD 202206 : Brown dwarfs or "superplanets"?]". Astronomy & Astrophysics 390: 267-279.
[edit] External links
- Notes for star HD 162020. The Extrasolar Planets Encyclopaedia. Retrieved on December 21, 2007.
- Notes for planet. The Extrasolar Planets Encyclopaedia. Retrieved on December 21, 2007.
- HD 162020 – Orange Main Sequence Star. Extrasolar Visions. Retrieved on December 21, 2007.
- HD 162020 B -- Brown dwarf. Extrasolar Visions. Retrieved on December 21, 2007.
- HD 162020 -- Star. SIMBAD. Retrieved on December 21, 2007.
- HD 162020 b -- Extra-solar Planet Candidate. SIMBAD. Retrieved on December 21, 2007.
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