| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces[1] |
| Right ascension | 01h 25m 12.51573s[2] |
| Declination | +28° 34′ 00.1030″[2] |
| Apparent magnitude (V) | +7.12[1] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | F8[1] |
| B−Vcolor index | 0.577±0.011[1] |
| Astrometry | |
| Radial velocity (Rv) | +19.05±0.14[2] km/s |
| Proper motion (μ) | RA: 251.270mas/yr[2] Dec.: −157.570mas/yr[2] |
| Parallax (π) | 22.3056±0.0218 mas[2] |
| Distance | 146.2 ± 0.1 ly (44.83 ± 0.04 pc) |
| Absolute magnitude (MV) | 3.88[1] |
| Details[4] | |
| Mass | 1.144±0.003 M☉ |
| Radius | 1.39±0.01 R☉ |
| Luminosity | 2.335±0.001 L☉ |
| Surface gravity (log g) | 4.21±0.03 cgs |
| Temperature | 6,065±6 K |
| Metallicity[Fe/H] | −0.06[5] dex |
| Rotational velocity (v sin i) | 6.6[6] km/s |
| Age | 5.0±0.1 Gyr |
| Other designations | |
| Bélénos,BD+27°225,GC 1710,HD 8574,HIP 6643,SAO 74702,LTT 10508,NLTT 4709[7] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 8574 is a single[8]star in theequatorialconstellation ofPisces. It can be viewed with binoculars or a telescope, but not with the naked eye having a lowapparent visual magnitude of +7.12.[1] The distance to this object is 146 light-years based onparallax, and it has anabsolute magnitude of 3.88.[1] The star is drifting further away from the Sun with aradial velocity of +19 km/s.[2] It has a relatively highproper motion, advancing across thecelestial sphere at the rate of 0.298 arc seconds per annum.[9]
The star HD 8574 is namedBélénos. The name was selected in theNameExoWorlds campaign byFrance, during the 100th anniversary of theIAU.Bélénos was the god of light, of the Sun, and of health inGaulish mythology.[10][11]
This object is anF-type star with astellar classification of F8[1] and unknownluminosity class. The star is five[4] billion years old and is spinning with aprojected rotational velocity of 6.6 km/s.[6] It has 1.1 times themass of the Sun and 1.4 times theSun's radius. The star is radiating 2.3 times theluminosity of the Sun from itsphotosphere at aneffective temperature of 6,065 K.
In 2001, anextrasolar planet in aneccentric orbit was announced by theEuropean Southern Observatory.[12] The discovery was published in 2003.[3] This object has at least double themass of Jupiter and has an eccentric orbit with aperiod of 0.62 years.[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 | — | — |
