HD 200661

HD 200661 (HR 8067) is a star in the constellation Equuleus. With an apparent magnitude of 6.41, it’s near the max naked eye visibility. The star is located 434 light-years (133 parsecs) based on parallax,[1] but is drifting closer with a heiolcentric radial velocity of -12.1 km/s.[5]

HD 200661
Observation data
Epoch J2000      Equinox J2000
Constellation Equuleus
Right ascension 21h 04m 41.64s[1]
Declination 02° 56′ 32.18″[1]
Apparent magnitude (V) 6.41±0.01[2]
Characteristics
Spectral type K0 III[3]
U−B color index +0.89[4]
B−V color index +1.06[4]
Astrometry
Radial velocity (Rv)-12.10[5] km/s
Proper motion (μ) RA: +13.064±0.086[1] mas/yr
Dec.: +6.155±0.066[1] mas/yr
Parallax (π)7.5081 ± 0.0431[1] mas
Distance434 ± 2 ly
(133.2 ± 0.8 pc)
Absolute magnitude (MV)+0.53[6]
Details
Mass1.74[7] M☉
Radius11.07+0.16
−0.57[1] R☉
Luminosity55.9±0.5[1] L☉
Surface gravity (log g)2.65[7] cgs
Temperature4,743+127
−33[1] K
Metallicity [Fe/H]-0.1[7] dex
Other designations
HIP 104041, HR 8067, HD 200661, BD+02°4297[8]
Database references
SIMBADdata

Properties

HD 200661 has a classification of “K0III”, which suggests it’s a K-type star that has exhausted hydrogen at its core. It has 1.74 times the Sun’s mass,[7] but has expanded to 11 times the Sun’s girth.[1] It radiates at about 56 solar luminosities[1] from it's photosphere at an effective temperature of 4743 K.[1]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 05: 0. Bibcode:1999MSS...C05....0H.
  4. Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals. 7. Bibcode:1971ROAn....7.....C.
  5. Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
  6. Anderson, E.; Francis, Ch. (1 May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
  7. Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
  8. "HR 8067". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 11–09–2021. Check date values in: |access-date= (help)
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