HD 171978

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)	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
	e Ser, BD−00 3521, FK5 3480, GC 25456, HIP 91322, HR 6993, PPM 180381, SAO 142444.[1]
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

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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[sb0-1] NSV 11122 -- Spectroscopic binary, database entry, SIMBAD. Accessed on line October 3, 2008.

[nsv1-2] NSV 11122, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line October 3, 2008.

[bsc2-3] 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.

[Fekel2013-4] 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.

[5] Figure is for the barycenter of the spectroscopic binary system.

[Anderson2012-6] 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.