HD 201298
Star in the constellation Equuleus
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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,[1] making it barely visible to the naked eye under ideal conditions. The star is situated at a distance of 1,140 light years[2] but is drifting away with a heliocentric radial velocity of 20 km/s.[6]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Equuleus[1] |
| Right ascension | 21h 08m 28.1388s[2] |
| Declination | +06° 59â² 21.695â³[2] |
| Apparent magnitude (V) | 6.14[1] |
| Characteristics | |
| Evolutionary stage | red giant branch?[3] |
| Spectral type | M0 III[4] |
| UâB color index | +1.97[5] |
| BâV color index | +1.66[5] |
| Astrometry | |
| Radial velocity (Rv) | 20 ± 2[6] km/s |
| Proper motion (μ) | RA: â10.643 mas/yr[2] Dec.: +2.479 mas/yr[2] |
| Parallax (Ï) | 2.8646±0.0533 mas[2] |
| Distance | 1,140 ± 20 ly (349 ± 6 pc) |
| Absolute magnitude (MV) | â0.39[7] |
| Details | |
| Mass | 1.83[8] Mâ |
| Radius | 117[8] Râ |
| Luminosity | 1,648[9] Lâ |
| Surface gravity (log g) | 0.413[10] cgs |
| Temperature | 3,732[9] K |
| Rotational velocity (v sin i) | 4.5 ± 1[11] km/s |
| Other designations | |
| 12 G. Equueli, AG+06°2888, BD+06°4754, FK5 3692, GC 29548, HD 201298, HIP 104357, HR 8090, SAO 126566[12][13] | |
| Database references | |
| SIMBAD | data |
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.[8] At present it has 1.83 times the mass of the Sun[8] and shines with a luminosity of 1,648 Lâ from its enlarged photosphere at an effective temperature of 3,732 K,[9] which gives it an orange glow. HD 201298 spins leisurely with a projected rotational velocity of 4.5±1 km/s,[11] slightly faster than most giants.