HD 8574

HD 8574 / Bélénos
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 mas[1]
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

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]

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 / Bélisama > 1.96±0.18 MJ 0.76±0.04 225±1.14 0.37±0.082 — —
  1. ^ a b c d e f g Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference AguileraGómez2018 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Earle2017 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Mugrauer2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).
  9. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  10. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  11. ^ Cite error: The named reference eso0114 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Perrier2003 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference Butler2006 was invoked but never defined (see the help page).