Astronomy:HD 86264

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Short description: Star in the constellation Hydra
HD 86264
Observation data
Equinox J2000.0]] (ICRS)
Constellation Hydra
Right ascension  09h 56m 57.83878s[1]
Declination −15° 53′ 42.4291″[1]
Apparent magnitude (V) 7.41[2]
Characteristics
Spectral type F7V[3]
Apparent magnitude (B) 7.920[2]
Apparent magnitude (J) 6.505±0.019[2]
Apparent magnitude (H) 6.344±0.038[2]
Apparent magnitude (K) 6.224±0.023[2]
B−V color index 0.510±0.011[2]
Astrometry
Radial velocity (Rv)7.39±0.13[1] km/s
Proper motion (μ) RA: −14.313±0.024[1] mas/yr
Dec.: −65.057±0.024[1] mas/yr
Parallax (π)14.8646 ± 0.0214[1] mas
Distance219.4 ± 0.3 ly
(67.27 ± 0.10 pc)
Absolute magnitude (MV)3.23[2]
Details
Mass1.46±0.01 M[4]
1.36+0.04
−0.05
 M
[5]
1.42[6] M
Radius1.53±0.02 R[4]
1.88[6] R
Luminosity4.02±0.04[4] L
Surface gravity (log g)4.13±0.04[5] cgs
Temperature6,616±39[4] K
Metallicity [Fe/H]0.26±0.03 Dex[7]
+0.202[6] dex
Rotational velocity (v sin i)12.8±0.5[6] km/s
Age0.8±0.2 Gyr[4]
2.78+0.47
−0.70
 Gyr
[5]
2.24[6] Gyr
Other designations
BD–15°2938, HD 86264, HIP 48780, SAO 155612, PPM 222239[8]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia
data

HD 86264 is a single[9] star with an exoplanetary companion in the equatorial constellation of Hydra. It is too faint to be readily visible to the naked eye with an apparent visual magnitude of 7.41.[2] The distance to this star, as determined by parallax measurements, is 219 light-years, and it is drifting further away with a radial velocity of +7.4 km/s.[1] A 2015 survey ruled out the existence of any stellar companions at projected distances above 30 astronomical units.[9]

This is an F-type main-sequence star with a stellar classification of F7V.[3] It is about two billion years old with a modest level of chromospheric activity and is spinning with a projected rotational velocity of 13 km/s.[6] The star is larger and more massive compared to the Sun, and it has a higher metallicity – the abundance of elements with a higher atomic number than helium.[6] It is radiating four times the luminosity of the Sun from its photosphere at an effective temperature of 6,616 K.[4]

Planetary system

In August 2009, it was announced that an exoplanet was found in an eccentric orbit around this host star.[6] The extended habitable zone for this star ranges from 1.50 astronomical unit|AU out to 5.06 AU. The planet orbits between 0.86 AU and 4.86 AU, crossing nearly all of the habitable zone.[10] An estimate of the planet's inclination and true mass via astrometry, though with high error, was published in 2022.[11]

The HD 86264 planetary system[6]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥7 ± 1.6 MJ 2.86 ± 0.07 1475 ± 55 0.7 ± 0.2

See also

  • List of extrasolar planets

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 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 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode2012AstL...38..331A. 
  3. 3.0 3.1 Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode1988mcts.book.....H. 
  4. 4.0 4.1 4.2 4.3 4.4 4.5 Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics 585: 14. doi:10.1051/0004-6361/201527297. A5. Bibcode2016A&A...585A...5B. 
  5. 5.0 5.1 5.2 Aguilera-Gómez, Claudia et al. (2018). "Lithium abundance patterns of late-F stars: An in-depth analysis of the lithium desert". Astronomy and Astrophysics 614: A55. doi:10.1051/0004-6361/201732209. Bibcode2018A&A...614A..55A. 
  6. 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Fischer, Debra et al. (2009). "Five planets and an independent confirmation of HD 196885 Ab from Lick Observatory". The Astrophysical Journal 703 (2): 1545–1556. doi:10.1088/0004-637X/703/2/1545. Bibcode2009ApJ...703.1545F. http://iopscience.iop.org/0004-637X/703/2/1545/fulltext/. 
  7. Gáspár, András et al. (2016). "The Correlation between Metallicity and Debris Disk Mass". The Astrophysical Journal 826 (2): 171. doi:10.3847/0004-637X/826/2/171. Bibcode2016ApJ...826..171G. 
  8. "HD 86264". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+86264. 
  9. 9.0 9.1 Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society 450 (3): 3127–3136. doi:10.1093/mnras/stv771. Bibcode2015MNRAS.450.3127M. https://academic.oup.com/mnras/article/450/3/3127/1063872. Retrieved 19 June 2020. 
  10. Sato, S. et al. (May 2017). "Climatological and ultraviolet-based habitability of possible exomoons in F-star systems". Astronomische Nachrichten 338 (4): 413–427. doi:10.1002/asna.201613279. Bibcode2017AN....338..413S. 
  11. Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode2022ApJS..262...21F. 

Coordinates: Sky map 09h 56m 57.8388s, −15° 53′ 42.438″