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HD 205877 is a visual binary star system in the constellation Indus. It also a double lined spectroscopic binary.[3] The components are very similar and both are located on the giant branch in the Hertzsprung–Russell diagram in agreement with the F7III spectral type.[4]

HD 205877
Observation data
Epoch J2000      Equinox J2000
Constellation Indus
Right ascension 21h 39m 59.719s[1]
Declination −52° 21′ 32.43″[1]
Apparent magnitude (V) 6.21[2]
Characteristics
Spectral type F7III[3]
U−B color index 0.32[2]
B−V color index 0.596[2]
Astrometry
Proper motion (μ) RA: −17.62±0.59[1] mas/yr
Dec.: 7.04±0.37[1] mas/yr
Parallax (π)5.75 ± 0.55 mas[1]
Distance570 ± 50 ly
(170 ± 20 pc)
Orbit[4]
PrimaryHD 205877 A
CompanionHD 205877 B
Period (P)21.31±0.74 yr
Semi-major axis (a)0.0762±0.0084″
Eccentricity (e)0.54±0.18
Inclination (i)150.4±11.1°
Longitude of the node (Ω)31.5±74.2°
Periastron epoch (T)1998.80±1.45
Argument of periastron (ω)
(secondary)		231.4±66.6°
Details
A
Mass2.34[4] M☉
B
Mass2.20[4] M☉
Other designations
HDS 3084, HIP 106978, HR 8269, WDS J21400-5222AB[5]
Database references
SIMBADdata

Stellar system


The visual binary nature of HD 205877 was discovered by the Hipparcos spacecraft and given the double star discoverer designation HDS 3084. The preliminary orbital elements of the system were determined with speckle interferometric measurements made at the 4.1 m Southern Astrophysical Research Telescope in Chile.[4]


References


  1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  2. Haggkvist, L.; Oja, T. (1987). "Narrow-band photometry of late-type stars. II". Astronomy and Astrophysics Supplement Series. 68 (2): 259–282. Bibcode:1987A&AS...68..259H.
  3. De Medeiros, J. R.; et al. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics. 561. A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.
  4. Tokovinin, Andrei (2017). "New Orbits Based on Speckle Interferometry at SOAR. II". The Astronomical Journal. 154 (3). 110. arXiv:1708.01300. Bibcode:2017AJ....154..110T. doi:10.3847/1538-3881/aa8459.
  5. "HD 205877". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-11.


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