59 Serpentis

59 Serpentis, also known as d Serpentis, is a multiple star in the constellation Serpens.[1] It is a triple star system.[6] The primary system is a spectroscopic binary consisting of an A-type star and an orange giant,[7] while the secondary is another orange giant.[8] The system shows irregular variations in brightness between magnitudes 5.17 and 5.2.[2]

This article is about d Serpentis. It is not to be confused with δ Serpentis.
59 Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension  18h 27m 12.50775s[1]
Declination 00° 11′ 45.9912″[1]
Apparent magnitude (V) 5.17-5.2[2]
Characteristics
Spectral type A0Vs + G:III[1]
U−B color index +0.21[3]
B−V color index +0.48[3]
Variable type Irregular
Astrometry
Radial velocity (Rv)-23.3[4] km/s
Proper motion (μ) RA: -3.67[5] mas/yr
Dec.: -8.61[5] mas/yr
Parallax (π)6.95 ± 0.63[5] mas
Distance470 ± 40 ly
(140 ± 10 pc)
Other designations
59 Ser, d Ser, HIP 90441, HD 169985, HR 6918, BD+00° 3936, ADS 11353, CCDM J18272+0012APB
Database references
SIMBADdata

References
  1. "d Serpentis -- Double or multiple star". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 2 July 2014.
  2. VSX (4 January 2010). "d Serpentis". AAVSO Website. American Association of Variable Star Observers. Retrieved 25 May 2014.
  3. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  4. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
  5. 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.
  6. Tilley, E. C. (1943). "A Spectrographic Study of the Triple System in 59 D Serpentis". The Astrophysical Journal. 98: 347. Bibcode:1943ApJ....98..347T. doi:10.1086/144577.
  7. Abt, H. A. (2009). "MK Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement Series. 180 (1): 117–118. Bibcode:2009ApJS..180..117A. doi:10.1088/0067-0049/180/1/117.
  8. "HD 169986 – Star in double system". SIMBAD. Retrieved 25 May 2014.


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