HD 171978
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) | ±0.031 11.415[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) | 636±0.000029 d 14.684 |
Eccentricity (e) | ±0.0011 0.2495 |
Periastron epoch (T) | 454405.073±0.011 2 |
Argument of periastron (ω) (secondary) | ±0.30 230.90° |
Semi-amplitude (K1) (primary) | ±0.050 km/s 37.918 |
Semi-amplitude (K2) (secondary) | ±0.076 km/s 38.569 |
Other designations | |
Database references | |
SIMBAD | data |
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]
References
- 1 2 3 4 5 6 NSV 11122 -- Spectroscopic binary, database entry, SIMBAD. Accessed on line October 3, 2008.
- 1 2 NSV 11122, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line October 3, 2008.
- 1 2 3 4 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.
- 1 2 3 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.
- ↑ 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 [astro-ph.GA], Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. Cite uses deprecated parameter
|class=
(help)
This article is issued from
Wikipedia.
The text is licensed under Creative Commons - Attribution - Sharealike.
Additional terms may apply for the media files.