HD 81040

HD 81040 is a star in the equatorial constellation of Leo. With an apparent visual magnitude of +7.73[2] it is too dim to be visible to the naked eye but can be viewed with a small telescope. The star is located at a distance of 112 light years from the Sun based on parallax. It is drifting further away with a radial velocity of +49 km/s,[3] having come to within 48 light-years some 527,000 years ago.

HD 81040
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 09h 23m 47.08736s[1]
Declination +20° 21 52.0282[1]
Apparent magnitude (V) +7.73[2]
Characteristics
Spectral type G0V[2]
B−V color index 0.680±0.012
Astrometry
Radial velocity (Rv)+49.270±0.0017[3] km/s
Proper motion (μ) RA: −151.258±0.093[1] mas/yr
Dec.: +36.125±0.065[1] mas/yr
Parallax (π)29.0122 ± 0.0649[1] mas
Distance112.4 ± 0.3 ly
(34.47 ± 0.08 pc)
Absolute magnitude (MV)5.12[4]
Details[2]
Mass0.87 M
Radius0.91+0.01
−0.03
[1] R
Luminosity0.76 L
Surface gravity (log g)4.48 cgs
Temperature5,753 K
Metallicity [Fe/H]−0.06±0.03[4] dex
Rotational velocity (v sin i)5.3 km/s
Age8.68 Gyr
Other designations
BD+20°2374, FK5 4836, GC 12951, HD 81040, HIP 46076, SAO 80800, PPM 99541[5]
Database references
SIMBADdata

This is an ordinary G-type main-sequence star with a stellar classification of G0V.[2] The Sun somewhat dwarfs HD 81040 in terms of physical characteristics: it has 87% of the Sun's mass and 91% of the radius of the Sun. It is spinning with a projected rotational velocity of 5.3 km/s,[2] and has near solar metallicity.[4] The age of the star is not precisely known; the ELODIE spectrograph suggested 0.8 Gyr and found it to have a young dust disk.[6] Later measurements by modelling chromosperic activity suggested an age of 4.18 Gyr.

== Planetary system == On November 24, 2005, a superjovian planet was announced by Sozzetti.

The HD 81040 planetary system[6]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥6.86±0.71 MJ 1.94 1,001.7±7.0 0.526±0.042

See also

  • List of extrasolar planets

References

  1. 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.
  2. Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
  3. Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
  4. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  5. "HD 81040". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-13.
  6. Sozzetti, A.; et al. (2006). "A massive planet to the young disc star HD 81040". Astronomy and Astrophysics. 449 (1): 417–424. arXiv:astro-ph/0511679. Bibcode:2006A&A...449..417S. doi:10.1051/0004-6361:20054303. S2CID 7647622.

Coordinates: 10h 38m 45.1s, −59° 10′ 59″

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