Astronomy: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 |
| Distance | 219.4 ± 0.3 ly (67.27 ± 0.10 pc) |
| Absolute magnitude (MV) | 3.23[2] |
| Details | |
| Mass | 1.46±0.01 M☉[4] 1.36+0.04 −0.05 M☉[5] 1.42[6] M☉ |
| Radius | 1.53±0.02 R☉[4] 1.88[6] R☉ |
| Luminosity | 4.02±0.04[4] L☉ |
| Surface gravity (log g) | 4.13±0.04[5] cgs |
| Temperature | 6,616±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 |
| Age | 0.8±0.2 Gyr[4] 2.78+0.47 −0.70 Gyr[5] 2.24[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| 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]
| 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
- ↑ 1.0 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.
- ↑ 2.0 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. Bibcode: 2012AstL...38..331A.
- ↑ 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. Bibcode: 1988mcts.book.....H.
- ↑ 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. Bibcode: 2016A&A...585A...5B.
- ↑ 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. Bibcode: 2018A&A...614A..55A.
- ↑ 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. Bibcode: 2009ApJ...703.1545F. http://iopscience.iop.org/0004-637X/703/2/1545/fulltext/.
- ↑ 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. Bibcode: 2016ApJ...826..171G.
- ↑ "HD 86264". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+86264.
- ↑ 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. Bibcode: 2015MNRAS.450.3127M. https://academic.oup.com/mnras/article/450/3/3127/1063872. Retrieved 19 June 2020.
- ↑ 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. Bibcode: 2017AN....338..413S.
- ↑ 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. Bibcode: 2022ApJS..262...21F.
Coordinates: 
09h 56m 57.8388s, −15° 53′ 42.438″
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