Astronomy:HD 81040

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Short description: Star in the constellation Leo
HD 81040
Observation data
Equinox J2000.0]] (ICRS)
Constellation Leo
Right ascension  09h 23m 47.08737s[1]
Declination +20° 21′ 52.0349″[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: −151.265±0.045[1] mas/yr
Dec.: 35.708±0.036[1] mas/yr
Parallax (π)29.0635 ± 0.0414[1] mas
Distance112.2 ± 0.2 ly
(34.41 ± 0.05 pc)
Absolute magnitude (MV)5.12[4]
Details
Mass0.962±0.040[5] M
Radius0.91+0.01
−0.03
[6] R
Luminosity0.838±0.018[7] L
Surface gravity (log g)4.48[2] cgs
Temperature5,753[2] K
Metallicity [Fe/H]−0.06±0.03[4] dex
Rotation15.98 d[7]
Rotational velocity (v sin i)5.3[2] km/s
Age1.79+0.30
−0.26
[7] Gyr
Other designations
BD+20°2374, FK5 4836, GC 12951, HD 81040, HIP 46076, SAO 80800, PPM 99541[8]
Database references
SIMBADdata

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.

Properties

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.[9] Later measurements by modelling chromosperic activity suggested an age of 4.18 Gyr.[citation needed]

Planetary system

On November 24, 2005, a superjovian planet was announced by Sozzetti et al.[9] It was discovered using the radial velocity method. Astrometric measurements using Gaia, published in several papers, show that the inclination of its orbit is about 111 degrees, so its true mass is somewhat higher than that predicted from its minimum mass.[7][5]

The HD 81040 planetary system[7][5]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 7.53±0.032 MJ 1.946±0.014 1,004.7±3.0 0.525+0.024
−0.026
111.4+4.4
−4.7
°

See also

References

  1. 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal 153 (1): 19. doi:10.3847/1538-3881/153/1/21. 21. Bibcode2017AJ....153...21L. 
  3. 3.0 3.1 Soubiran, C. et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. Bibcode2018A&A...616A...7S. 
  4. 4.0 4.1 4.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode2012AstL...38..331A. 
  5. 5.0 5.1 5.2 Winn, Joshua N. (September 2022). "Joint Constraints on Exoplanetary Orbits from Gaia DR3 and Doppler Data". The Astronomical Journal 164 (5): 196. doi:10.3847/1538-3881/ac9126. Bibcode2022AJ....164..196W. 
  6. Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  7. 7.0 7.1 7.2 7.3 7.4 Li, Yiting; Brandt, Timothy D.; Brandt, G. Mirek; Dupuy, Trent J.; Michalik, Daniel; Jensen-Clem, Rebecca; Zeng, Yunlin; Faherty, Jacqueline et al. (2021). "Precise Masses and Orbits for Nine Radial-velocity Exoplanets". The Astronomical Journal 162 (6): 266. doi:10.3847/1538-3881/ac27ab. Bibcode2021AJ....162..266L. 
  8. "HD 81040". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+81040. 
  9. 9.0 9.1 Sozzetti, A. et al. (2006). "A massive planet to the young disc star HD 81040". Astronomy and Astrophysics 449 (1): 417–424. doi:10.1051/0004-6361:20054303. Bibcode2006A&A...449..417S. http://www.aanda.org/articles/aa/full/2006/13/aa4303-05/aa4303-05.html. 

External links

Coordinates: Sky map 09h 23m 47.0873s, +20° 21′ 52.034″