HAT-P-38
Star in the constellation Traingulum. / From Wikipedia, the free encyclopedia
HAT-P-38, formally named Horna, is a star located in the northern constellation Triangulum. It has an apparent magnitude of 12.51,[2] 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. [1]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Triangulum |
Right ascension | 02h 21m 31.98035s[1] |
Declination | +32° 14′ 46.0933″[1] |
Apparent magnitude (V) | 12.51±0.02[2] |
Characteristics | |
Spectral type | G5[3] |
B−V color index | +0.83[2] |
Astrometry | |
Radial velocity (Rv) | −19.85±0.73[1] km/s |
Proper motion (μ) | RA: +47.671 mas/yr[1] Dec.: −21.594 mas/yr[1] |
Parallax (π) | 3.9747 ± 0.0134 mas[1] |
Distance | 821 ± 3 ly (251.6 ± 0.8 pc) |
Details | |
Mass | 0.886±0.044[4] M☉ |
Radius | 1.01+0.07 −0.05[5] R☉ |
Luminosity | 0.6772+0.007 −0.008[1] L☉ |
Surface gravity (log g) | 4.46±0.08[6] cgs |
Temperature | 5,330±100[4] K |
Metallicity [Fe/H] | +0.06±0.10[7] dex |
Rotational velocity (v sin i) | 0.4±0.5[4] km/s |
Age | 10.1+3.9 −4.8[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HAT-P-38 has a stellar classification of G5,[3] indicating that it is a G-type star. It has 88.6% the mass of the Sun[4] and 101% the radius of the Sun.[5] It radiates 67.72% the luminosity of the Sun[1] from its photosphere at an effective temperature of 5,330 K,[4] giving it a yelllowish-orange hue. HAT-P-38 is slightly metal enriched with an iron abundance 115% that of the Sun's.[7] It is estimated to be approximately 10.1 billion years old,[7] which is more than twice the age of the Sun. It spins modestly with a projected rotational velocity of 0.4 km/s.[4]