| Observation data Epoch J2000 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Equuleus |
| Right ascension | 21h 22m 18.87390s[1] |
| Declination | +05° 01′ 24.9072″[1] |
| Apparent magnitude (V) | 8.23[2] |
| Characteristics | |
| Spectral type | G6 V[3] |
| B−V color index | +0.66[2] |
| Astrometry | |
| Radial velocity (Rv) | −61.70±0.13[1] km/s |
| Proper motion (μ) | RA: 180.093±0.035 mas/yr[1] Dec.: 0.098±0.031 mas/yr[1] |
| Parallax (π) | 13.7402 ± 0.0370 mas[1] |
| Distance | 237.4 ± 0.6 ly (72.8 ± 0.2 pc) |
| Absolute magnitude (MV) | +4.2[2] |
| Details | |
| Mass | 0.82[4] M☉ |
| Radius | 1.48+0.05 −0.02[5] R☉ |
| Luminosity | 2.31±0.01[5] L☉ |
| Surface gravity (log g) | 4.25[4] cgs |
| Temperature | 5847+35 −94[5] K |
| Metallicity [Fe/H] | +0.18[4] dex |
| Rotational velocity (v sin i) | 1[6] km/s |
| Age | 5.2[4] or 8.5[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 203473 is a star in the equatorial constellation Equuleus. With an apparent magnitude of 8.23,[2] it’s only visible by using an amateur telescope. The star is located at a distance of 237 light years[1] based on its parallax shift but is drifting closer at a high rate of 61.7 km/s.[1] As of 2014, no stellar companions have been detected around the star.[7]
HD 203473 is an ordinary G-type main-sequence star with 82% the mass of the Sun,[4] but is 48% larger than the latter.[5] This star is over luminous and hot for its class, with it radiating at 2.31 the luminosity of the Sun[5] and an effective temperature of 5,847 K.[5] HD 203473 has different age estimates, either being 5[4] or 8[6] billion years old. The higher luminosity and low projected rotational velocity of 1 km/s[6] favors the older age estimate. Like many planetary hosts, HD 203473 has an enhanced metallicity, with an iron abundance 1.51 times that of the Sun.[4]
GaiaDR3 was invoked but never defined (see the help page).XHIP was invoked but never defined (see the help page).Houk1999 was invoked but never defined (see the help page).Brewer2016 was invoked but never defined (see the help page).GaiaDR2 was invoked but never defined (see the help page).Nord2004 was invoked but never defined (see the help page).Toko2014 was invoked but never defined (see the help page).