Global InformationHD 200661 information
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Equuleus |
| Right ascension | 21h 04m 41.6405s[1] |
| Declination | +02° 56′ 32.1874″[1] |
| Apparent magnitude (V) | 6.41±0.01[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | K0 III[4] |
| U−B color index | +0.89[5] |
| B−V color index | +1.06[5] |
| Astrometry | |
| Radial velocity (Rv) | −12.1 ± 0.2[6] km/s |
| Proper motion (μ) | RA: +13.336[1] mas/yr Dec.: +5.800[1] mas/yr |
| Parallax (π) | 7.5933 ± 0.0353 mas[1] |
| Distance | 430 ± 2 ly (131.7 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.53[7] |
| Details | |
| Mass | 1.74[8] M☉ |
| Radius | 10.62[9] R☉ |
| Luminosity | 51.3[10] L☉ |
| Surface gravity (log g) | 2.1[11] cgs |
| Temperature | 4,740[10] K |
| Metallicity [Fe/H] | −0.1[8] dex |
| Other designations | |
7 G. Equueli, AG+02° 2688, BD+02°4297, GC 29434, HD 200661, HIP 104041, HR 8067, SAO 126519[12] | |
| Database references | |
| SIMBAD | data |
HD 200661 (HR 8067) is a solitary star in the equatorial constellation Equuleus. It has an apparent magnitude of 6.41, placing it near the max naked eye visibility. The star is situated at a distance of 430 light years[1] but is approaching with a heliocentric radial velocity of −12.1 km/s.[6]
HD 200661 has a stellar classification of K0 III,[4] indicating that the object is an early K-type giant star that is on the horizontal branch.[3] It has an angular diameter of 0.75±0.05 mas, which yields a diameter 10.62[9] times that of the Sun at its estimated distance. At present HD 200661 has 1.74 times the Sun’s mass,[8] and shines at 51.3 times the luminosity of the Sun[10] from its enlarged photosphere at an effective temperature of 4,740 K,[10] giving it a yellow-orange glow.
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