HD 8574

HD 8574 is a single[7] star in the equatorial constellation of Pisces. It can be viewed with binoculars or a telescope, but not with the naked eye having a low apparent visual magnitude of +7.12.[2] The distance to this object is 146 light years based on parallax, and it has an absolute magnitude of 3.88.[2] The star is drifting further away from the Sun with a radial velocity of +18 km/s.[1] It has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.298 arc seconds per annum.[8]

HD 8574
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 01h 25m 12.5156s[1]
Declination +28° 34′ 00.1015″[1]
Apparent magnitude (V) +7.12[2]
Characteristics
Spectral type F8[2]
B−V color index 0.577±0.011[2]
Astrometry
Radial velocity (Rv)+18.40±0.47[1] km/s
Proper motion (μ) RA: 251.399±0.080[1] mas/yr
Dec.: −157.461±0074[1] mas/yr
Parallax (π)22.2795 ± 0.0463[1] mas
Distance146.4 ± 0.3 ly
(44.88 ± 0.09 pc)
Absolute magnitude (MV)3.88[2]
Details[3]
Mass1.144±0.003 M☉
Radius1.39±0.01 R☉
Luminosity2.335±0.001 L☉
Surface gravity (log g)4.21±0.03 cgs
Temperature6,065±6 K
Metallicity [Fe/H]−0.06[4] dex
Rotational velocity (v sin i)6.6[5] km/s
Age5.0±0.1 Gyr
Other designations
Bélénos, BD+27°225, GC 1710, HD 8574, HIP 6643, SAO 74702, LTT 10508, NLTT 4709[6]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

The star HD 8574 is named Bélénos. The name was selected in the NameExoWorlds campaign by France, during the 100th anniversary of the IAU. Bélénos was the god of light, of the Sun, and of health in Gaulish mythology.[9][10]

This object is an F-type star with a stellar classification of F8[2] and unknown luminosity class. The star is five[3] billion years old and is spinning with a projected rotational velocity of 6.6 km/s.[5] It has 1.1 times the mass of the Sun and 1.4 times the Sun's radius. The star is radiating 2.3 times the luminosity of the Sun from its photosphere at an effective temperature of 6,065 K.

In 2001, an extrasolar planet in an eccentric orbit was announced by the European Southern Observatory.[11] The discovery was published in 2003.[12] This object has at least double the mass of Jupiter and has an eccentric orbit with a period of 0.62 years.[13]

The HD 8574 planetary system[13]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b > 1.96±0.18 MJ 0.76±0.04 225±1.14 0.37±0.082 — —

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. 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.
  3. Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
  4. 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. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. S2CID 62799777.
  5. 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.
  6. "HD 8574". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-09.
  7. Mugrauer, M.; et al. (May 2006). "A search for wide visual companions of exoplanet host stars: The Calar Alto Survey". Astronomische Nachrichten. 327 (4): 321. arXiv:astro-ph/0602067. Bibcode:2006AN....327..321M. doi:10.1002/asna.200510528. S2CID 118902770.
  8. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
  9. "Approved names". NameExoworlds. Retrieved 2020-01-02.
  10. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  11. "Exoplanets: The Hunt Continues!" (Press release). Garching, Germany: European Southern Observatory. April 4, 2001. Retrieved December 27, 2012.
  12. Perrier, C.; et al. (2003). "The ELODIE survey for northern extra-solar planets. I. Six new extra-solar planet candidates". Astronomy and Astrophysics. 410 (3): 1039–1049. arXiv:astro-ph/0308281. Bibcode:2003A&A...410.1039P. doi:10.1051/0004-6361:20031340. S2CID 6946291.
  13. Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. S2CID 119067572.

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