HD 205877
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]
| 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[1] mas |
| Distance | 570 ± 50 ly (170 ± 20 pc) |
| Orbit[4] | |
| Primary | HD 205877 A |
| Companion | HD 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 | |
| Mass | 2.34[4] M☉ |
| B | |
| Mass | 2.20[4] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
gollark: Ideatic idea: figure out lambda calculus and use the monad thing to run "get 10 mana" 127412941 times.
gollark: none are safe.
gollark: Ah.
gollark: How do I *make* a `λx. x x` anyway?
gollark: oh bee.
References
- 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
- 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.
- 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.
- 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.
- "HD 205877". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-11.
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