HAT-P-38
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| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Triangulum[1] |
| Right ascension | 02h 21m 31.98035s[2] |
| Declination | +32° 14′ 46.0933″[2] |
| Apparent magnitude (V) | 12.51±0.02[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G5[4] |
| B−V color index | +0.83[3] |
| Astrometry | |
| Radial velocity (Rv) | −19.85±0.73[2] km/s |
| Proper motion (μ) | RA: +47.671 mas/yr[2] Dec.: −21.594 mas/yr[2] |
| Parallax (π) | 3.9747±0.0134 mas[2] |
| Distance | 821 ± 3 ly (251.6 ± 0.8 pc) |
| Details | |
| Mass | 0.886±0.044[5] M☉ |
| Radius | 1.01+0.07 −0.05[6] R☉ |
| Luminosity | 0.6772+0.007 −0.008[2] L☉ |
| Surface gravity (log g) | 4.46±0.08[7] cgs |
| Temperature | 5,330±100[5] K |
| Metallicity [Fe/H] | +0.06±0.10[8] dex |
| Rotational velocity (v sin i) | 0.4±0.5[5] km/s |
| Age | 10.1+3.9 −4.8[8] Gyr |
| Other designations | |
| Horna, TOI-3681, TIC 285272237, GSC 02314-00559 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HAT-P-38, formally named Horna, is a star located in the northern constellation Triangulum. It has an apparent magnitude of 12.51,[3] making it readily visible in amateur telescopes but not to the naked eye. The object is located relatively far at a distance of 821 light-years based on Gaia DR3 parallax measurements, but it is drifting closer with a spectroscopic radial velocity of −19.85 km/s. [2]
HAT-P-38 has a stellar classification of G5,[4] indicating that it is a G-type star. It has 88.6% the mass of the Sun[5] and 101% the radius of the Sun.[6] It radiates 67.72% the luminosity of the Sun[2] from its photosphere at an effective temperature of 5,330 K,[5] giving it a yelllowish-orange hue. HAT-P-38 is slightly metal enriched with an iron abundance 115% that of the Sun's.[8] It is estimated to be approximately 10.1 billion years old,[8] which is more than twice the age of the Sun. It spins modestly with a projected rotational velocity of 0.4 km/s.[5]
