Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Equuleus |
Right ascension | 21h 08m 28.1388s[1] |
Declination | +06° 59′ 21.6948″[1] |
Apparent magnitude (V) | 6.14[2] |
Characteristics | |
Evolutionary stage | red giant branch?[3] |
Spectral type | M0 III[4] |
U−B color index | +1.97[5] |
B−V color index | +1.66[5] |
Astrometry | |
Radial velocity (Rv) | 20 ± 2[6] km/s |
Proper motion (μ) | RA: −10.643 mas/yr[1] Dec.: +2.479 mas/yr[1] |
Parallax (π) | 2.8646 ± 0.0533 mas[1] |
Distance | 1,140 ± 20 ly (349 ± 6 pc) |
Absolute magnitude (MV) | −1.57[note 1] |
Details | |
Mass | 1.83[7] M☉ |
Radius | 117[7] R☉ |
Luminosity | 1,648[8] L☉ |
Surface gravity (log g) | 0.413[9] cgs |
Temperature | 3,732[8] K |
Rotational velocity (v sin i) | 4.5 ± 1[10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 201298 (HR 8090) is a solitary star located in the northern constellation Equuleus just next to 3 Equulei It has an apparent magnitude of 6.14,[2] making it barely visible to the naked eye under ideal conditions. The star is situated at a distance of 1,140 light years[1] but is drifting away with a heliocentric radial velocity of 20 km/s.[6]
HD 201298 has a stellar classification of M0 III, indicating that it is ageing M-type star[4] that is probably on the red giant branch.[3] As a result, it has expanded to 117 times the Sun's girth.[7] At present it has 1.83 times the mass of the Sun[7] and shines with a luminosity of 1,648 L☉ from its enlarged photosphere at an effective temperature of 3,732 K,[8] which gives it an orange glow. HD 201298 spins leisurely with a projected rotational velocity of 4.5±1 km/s,[10] slightly faster than most giants.