HD 34445

HD 34445
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[1] mas
Distance148 ± 2 ly
(45.4 ± 0.6 pc)
Absolute magnitude (MV)4.04 ± 0.10[2]
Details
Mass1.07 ± 0.02[2] M☉
Radius1.38 ± 0.08[2] R☉
Luminosity2.01 ± 0.2[2] L☉
Surface gravity (log g)4.21 ± 0.08[2] cgs
Temperature5836 ± 44[2] K
Metallicity+0.14 ± 0.04[2]
Rotation~22 d[4]
Rotational velocity (v sin i)2.7 ± 0.5 km/s
Age8.5 ± 2.0[2] Gyr
Other designations
BD+07° 855, HIP 24681, SAO 112601[5]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		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 M⊕ and 200.0 M⊕.[2]

The HD 34445 planetary system[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

  1. 1 2 3 4 5 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.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 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.
  3. ↑ 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.
  4. 1 2 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.
  5. ↑ "HD 34445". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 November 2017.

Notes

  1. ↑ The metallicity is given as a logarithm. 100.14 ≈ 1.4

Coordinates: 05h 17m 40.9786s, +07° 21′ 12.036″


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.