HD 200661

HD 200661
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]
Distance430 ± 2 ly
(131.7 ± 0.6 pc)
Absolute magnitude (MV)+0.53[7]
Details
Mass1.74[8] M☉
Radius10.62[9] R☉
Luminosity51.3[10] L☉
Surface gravity (log g)2.1[11] cgs
Temperature4,740[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
SIMBADdata

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.

  1. ^ a b c d e f Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gontcharov2008 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Cousin1971 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Lang2006 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Lafrasse2010 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).