HD 38529
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Orion |
| Right ascension | 05h 46m 34.9120s |
| Declination | +01° 10' 05.496" |
| Apparent magnitude (V) | +5.94 / +13.35 |
| Characteristics | |
| Spectral type | G4IV / M3.0V |
| U-B color index | ? / ? |
| B-V color index | 0.773 / 0.46 |
| Variable type | none / ? |
| Astrometry | |
| Radial velocity (Rv) | 28.9 km/s |
| Proper motion (μ) | RA: -80.05 mas/yr Dec.: -141.79 mas/yr |
| Parallax (π) | 23.57 ± 0.92 mas |
| Distance | 138 ± 5 ly (42 ± 2 pc) |
| Absolute magnitude (MV) | +2.81 / +10.23 |
| Details | |
| Mass | 1.39 / ? M☉ |
| Radius | 2.82 / ? R☉ |
| Luminosity | 5.90 / ? L☉ |
| Temperature | 5370 / ? K |
| Metallicity | 0.29 ± 0.05 [Fe/H] |
| Rotation | 34.5 / ? |
| Age | ~3700 million years |
| Other designations | |
HD 38529 (also known as HR 1988) is a binary star located about 138 light-years away in the constellation Orion.
Contents |
[edit] HD 38529 A
HD 38529 A is a yellow subgiant star, which has also been classified as a main sequence dwarf of spectral type G4V. It is about 40% more massive than our Sun. Two substellar companions are known in orbit around this star, including one brown dwarf.
[edit] HD 38529 Ab
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 0.129 AU | |
| Eccentricity e: | 0.29 (± 0.02) | |
| Orbital period P: | 14.309 (± 0.05) d | |
| Inclination i: | ?° | |
| Angular distance θ: | 3 mas | |
| Longitude of periastron ω: |
87.7 (± 4)° | |
| Time of periastron τ: | 2,450,005.8 (± 1.5) JD | |
| Semi-amplitude K: | 56.8 (± 1.6) m/s | |
| Physical characteristics | ||
| Mass: | >0.78 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Gravity: | ? g | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | 2000 | |
| Discovery site: | ||
| Detection method(s): | Doppler Spectroscopy | |
| Discoverer(s): | Marcy et al. | |
| Other catalogue | ||
HD 38529 Ab is an extrasolar planet discovered in 2000. Because of its mass, it is likely that it is a gas giant.
[edit] HD 38529 Ac
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 3.68 AU | |
| Eccentricity e: | 0.36 (± 0.05) | |
| Orbital period P: | 2174.3 (± 30) d | |
| Inclination i: | 160° | |
| Angular distance θ: | 87 mas | |
| Longitude of periastron ω: |
14.7 (± 10)° | |
| Time of periastron τ: | 2,450,073.8 (± 35) JD | |
| Semi-amplitude K: | 170.3 (± 1.7) m/s | |
| Physical characteristics | ||
| Mass: | 37+36-19 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Gravity: | ? g | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | 2002 | |
| Discovery site: | ||
| Detection method(s): | Doppler Spectroscopy | |
| Discoverer(s): | Marcy et al. | |
| Other catalogue | ||
HD 38529 Ac is a brown dwarf companion to HD 38529 A. Radial velocity measurements give a minimum mass of 12.7 times that of Jupiter, close to the brown dwarf limit at 13 Jupiter masses. Astrometric measurements from the Hipparcos mission give a best fit inclination of 160° and a mass 37 times that of Jupiter.
[edit] HD 38529 B
HD 38529 B is a common proper motion stellar companion to HD 38529 A at a projected distance of about 12042 AU. The star is a red dwarf of spectral type M3.0V.
[edit] See also
[edit] References
- Fischer et al. (2002). "Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets". The Astrophysical Journal 551 (2): 1107 – 1118. doi:.
- Fischer et al. (2003). "A Planetary Companion to HD 40979 and Additional Planets Orbiting HD 12661 and HD 38529". The Astrophysical Journal 586 (2): 1394 – 1408. doi:.
- Reffert, S., Quirrenbach, A. (2006). "Hipparcos astrometric orbits for two brown dwarf companions: HD 38529 and HD 168443" (abstract). Astronomy and Astrophysics 449: 699 – 702. doi:.
- Raghavan et al. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems" (abstract). The Astrophysical Journal 646 (1): 523 – 542. doi:. (web Preprint)
[edit] External links
- HD 38529. SIMBAD. Retrieved on 14 April 2006.
- Notes for star HD 38529. The Extrasolar Planets Encyclopaedia. Retrieved on 14 April 2006.
- John Whatmough. HD 38529. Extrasolar Visions. Retrieved on 14 April 2006.
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