HD 171978
The star HD 171978 is a spectroscopic binary in the constellation of Serpens. It consists of two A-type main sequence stars orbiting each other with a period of approximately 14.7 days.[4] The overall apparent visual magnitude of the system varies between 5.74 and 5.86.[2]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Serpens |
Right ascension | 18h 37m 35.9613s[1] |
Declination | −00° 18′ 34.100″[1] |
Apparent magnitude (V) | 5.74 to 5.86[2] |
Characteristics | |
Spectral type | A1V / A1V (spectroscopic binary)[3] |
U−B color index | +0.06[3] |
B−V color index | +0.07[3] |
R−I color index | +0.04[3] |
Astrometry | |
Radial velocity (Rv) | 11.415±0.031[4][5] km/s |
Proper motion (μ) | RA: 11.74[1] mas/yr Dec.: −19.83[1] mas/yr |
Parallax (π) | 5.06 ± 0.93[1] mas |
Distance | approx. 600 ly (approx. 200 pc) |
Absolute magnitude (MV) | −0.26[6] |
Orbit[4] | |
Period (P) | 14.684636±0.000029 d |
Eccentricity (e) | 0.2495±0.0011 |
Periastron epoch (T) | 2454405.073±0.011 |
Argument of periastron (ω) (secondary) | 230.90±0.30° |
Semi-amplitude (K1) (primary) | 37.918±0.050 km/s |
Semi-amplitude (K2) (secondary) | 38.569±0.076 km/s |
Other designations | |
Database references | |
SIMBAD | data |
References
- NSV 11122 -- Spectroscopic binary, database entry, SIMBAD. Accessed on line October 3, 2008.
- NSV 11122, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line October 3, 2008.
- HR 6993, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line October 3, 2008.
- Fekel, Francis C.; Tomkin, Jocelyn; Williamson, Michael H. (2013). "New Precision Orbits of Bright Double-lined Spectroscopic Binaries. VIII. HR 1528, HR 6993, 2 Sagittae, and 18 Vulpeculae". The Astronomical Journal. 146 (5). 129. Bibcode:2013AJ....146..129F. doi:10.1088/0004-6256/146/5/129. hdl:2152/34407.
- Figure is for the barycenter of the spectroscopic binary system.
- Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
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