HD 23079
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Reticulum |
| Right ascension | 03h 39m 43.10s |
| Declination | -52° 54′ 57.02″ |
| Apparent magnitude (V) | +7.1 |
| Absolute magnitude (V) | +4.4 |
| Distance | 113.5 ly (34.8 pc) |
| Spectral type | F8/G0V |
| Other designations | |
HD 23079 is a star in the constellation Reticulum, located 113.5 light years away from the solar system. Since the star is magnitude 7.1, it is not visible to the naked eye, but at least in binoculars, it should be easily visible. The spectral type is F8 or G0, it is a main-sequence (hydrogen-fusing) star. The star is larger and more massive than our Sun. As it is typical for planet-harboring stars, it is a population I star, with metallicity of –0.24 dex (58% solar). The age of the star is 6.53 billion years old, older than Sun’s 4.57 billion years old.
The star has one known planet.
[edit] HD 23079 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 1.60±0.12 AU |
| Eccentricity | (e) | 0.102±0.031 |
| Orbital period | (P) | 730.6±5.7 d |
| Angular distance | (θ) | 47 mas |
| Longitude of periastron |
(ω) | 55±17° |
| Time of periastron | (T0) | 2,450,492±37 JD |
| Semi-amplitude | (K) | 54.9±1.1 m/s |
| Physical characteristics | ||
| Mass | (m) | >2.45±0.16 MJ |
| Discovery information | ||
| Discovery date | October 2001 | |
| Discoverer(s) | Tinney et al. | |
| Detection method | doppler spectroscopy | |
| Discovery status | Published | |
HD 23079 b is an exoplanet orbiting the star HD 23079. The planet has the mass of 2.45 Jupiters, classifying as massive jovian; although only the minimum mass is known since inclination is unknown. The planet takes almost exactly two years to orbit the star at the average distance of 1.6 AU. The planets orbital eccentricity is about the same as 109 Piscium b, HD 75898 b, and HD 69830 b at 0.102. The distance range from as close as 1.44 AU to as far away as 1.76 AU from the parent star. The apparent angular separation between a planet and a star as visible from Earth is 47 milliarcseconds. The speed of stellar wobble caused by a planet [semi-amplitude] is 54.9 m/s.
Since if planet is massive, it would likely be a gas giant comparable to Jupiter, Saturn, Uranus, and Neptune in the solar system. In Sudarsky classification scheme, the planet is probably a water jovian with clouds made mainly from water, as the planet orbits at 1.60 AU from the Sun-like star.
The planet was discovered in 2001 by Tinney et al., who used doppler spectrometer to look for shifts of star’s spectrum caused by a gravity of the planet tug the star around as the planet orbits.
[edit] References
- Tinney et al. (2002). "Two Extrasolar Planets from the Anglo-Australian Planet Search". The Astrophysical Journal 571 (1): 528 – 531. doi:.
- Dvorak, R.; Pilat-Lohinger, E.; Schwarz, R.; Freistetter, F. (2004). "Extrasolar Trojan planets close to habitable zones". Astronomy &Astrophysics 426: L37. doi:.
