HD 34445
Appearance
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Orion |
Right ascension | 05h 17m 40.9804s[1] |
Declination | +07° 21′ 12.053″[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: −0.723[1] mas/yr Dec.: −146.869[1] mas/yr |
Parallax (π) | 22.04 ± 0.29 mas[1] |
Distance | 148 ± 2 ly (45.4 ± 0.6 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 |
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 148 light-years (45.4 parsecs) away.
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 ME and 200.0 ME.[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
References
- ^ a b c d e Gaia Collaboration (2016). "Gaia Data Release 1". Astronomy & Astrophysics. 595: A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.
- ^ a b c d e f g h i j k l m n o 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.
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: CS1 maint: unflagged free DOI (link) - ^ Soubiran, C.; et al. (2013). "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release". Astronomy & Astrophysics. 552: 11. arXiv:1302.1905. Bibcode:2013A&A...552A..64S. doi:10.1051/0004-6361/201220927. A64.
- ^ a b 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