HD 34445
HD 34445 is a 7th-magnitude G-type main-sequence star located in the constellation Orion. Parallax measurements made by Gaia put the star at about 150.5 light-years (46.15 parsecs) away.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 17m 40.9804s[1] |
| Declination | +07° 21′ 12.0548″[1] |
| Apparent magnitude (V) | 7.31 ± 0.03[2] |
| Characteristics | |
| Spectral type | G0 V[2] |
| B−V color index | 0.661 ± 0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −78.906 ± 0.0082[3] km/s |
| Proper motion (μ) | RA: −0.811±0.076[1] mas/yr Dec.: −146.997±0.061[1] mas/yr |
| Parallax (π) | 21.6675 ± 0.0464[1] mas |
| Distance | 150.5 ± 0.3 ly (46.15 ± 0.10 pc) |
| Absolute magnitude (MV) | 4.04 ± 0.10[2] |
| Details | |
| Mass | 1.07 ± 0.02[2] M☉ |
| Radius | 1.38 ± 0.08[2] R☉ |
| Luminosity | 2.01 ± 0.2[2] L☉ |
| Surface gravity (log g) | 4.21 ± 0.08[2] cgs |
| Temperature | 5836 ± 44[2] K |
| Metallicity | +0.14 ± 0.04[2] |
| Rotation | ~22 d[4] |
| Rotational velocity (v sin i) | 2.7 ± 0.5 km/s |
| Age | 8.5 ± 2.0[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
At an age of 8.5 billion years, this star is larger, hotter, brighter, and more massive than our Sun.[2] Also its metal content is roughly 40% greater than the Sun.[note 1] In 2004, a gas giant planet was found in orbit around the star, but it was not until 2009 that this planet was confirmed.[4] In 2017, five more planets were found.[2] All have minimum masses significantly greater than that of the Earth, between 16.8 M⊕ and 200.0 M⊕.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| e | ≥0.0529 ± 0.0089 MJ | 0.2687 ± 0.0019 | 49.175 ± 0.045 | 0.090 ± 0.062 | — | — |
| d | ≥0.097 ± 0.13 MJ | 0.4817 ± 0.0033 | 117.87 ± 0.18 | 0.027 ± 0.051 | — | — |
| c | ≥0.168 ± 0.016 MJ | 0.7181 ± 0.0049 | 214.67 ± 0.45 | 0.036 ± 0.071 | — | — |
| f | ≥0.119 ± 0.021 MJ | 1.543 ± 0.016 | 676.8 ± 7.9 | 0.031 ± 0.057 | — | — |
| b | ≥0.629 ± 0.028 MJ | 2.075 ± 0.016 | 1056.7 ± 4.7 | 0.014 ± 0.035 | — | — |
| g | ≥0.38 ± 0.13 MJ | 6.36 ± 1.02 | 5700 ± 1500 | 0.032 ± 0.080 | — | — |
See also
- HD 126614
- HD 24496
- HD 13931
- Gliese 179
- QS Virginis
- List of extrasolar planets
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Vogt, Steven S; Butler, R. Paul; Burt, Jennifer; Tuomi, Mikko; Laughlin, Gregory; Holden, Brad; Teske, Johanna K; Shectman, Stephen A; Crane, Jeffrey D; Díaz, Matías; Thompson, Ian B; Arriagada, Pamela; Keiser, Sandy (2017). "A Six-planet System around the Star HD 34445". The Astronomical Journal. 154 (5): 181. arXiv:1710.07337. Bibcode:2017AJ....154..181V. doi:10.3847/1538-3881/aa8b61.
- Soubiran, C.; et al. (2013). "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release". Astronomy and Astrophysics. 552. A64. arXiv:1302.1905. Bibcode:2013A&A...552A..64S. doi:10.1051/0004-6361/201220927.
- Howard, Andrew W.; et al. (2010). "The California Planet Survey. I. Four New Giant Exoplanets". The Astrophysical Journal. 721 (2): 1467–1481. arXiv:1003.3488. Bibcode:2010ApJ...721.1467H. doi:10.1088/0004-637X/721/2/1467.
- "HD 34445". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 November 2017.
Notes
- The metallicity is given as a logarithm. 100.14 ≈ 1.4
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.