HD 216718
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 55m 10.96166s[1]
Declination −04° 59′ 16.4546″
Apparent magnitude (V) 5.72[2] (6.03 + 7.75)[3]
Characteristics
Spectral type K0III-IV[4]
U−B color index +0.60[2]
B−V color index +0.88[2]
Astrometry
Radial velocity (Rv)−7.06±0.13[5] km/s
Proper motion (μ) RA: +29.88[1] mas/yr
Dec.: −10.78[1] mas/yr
Parallax (π)11.99 ± 0.65 mas[1]
Distance270 ± 10 ly
(83 ± 5 pc)
Orbit[3]
Period (P)96.48 yr
Semi-major axis (a)0.4810″
Eccentricity (e)0.6430
Details
Surface gravity (log g)3.16[6] cgs
Temperature5,080[6] K
Metallicity [Fe/H]0.04[6] dex
Rotational velocity (v sin i)0.0[5] km/s
Other designations
BD-05° 5885, HD 216718, HIP 113184, HR 8716, SAO 146388.
Database references
SIMBADdata

HD 216718 is a binary star system in the equatorial constellation of Aquarius.

References

  1. 1 2 3 4 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, S2CID 18759600
  2. 1 2 3 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N
  3. 1 2 Malkov, O. Yu.; et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
  4. ↑ Randich, S.; et al. (August 1999), "Lithium in population I subgiants", Astronomy and Astrophysics, 348: 487–500, Bibcode:1999A&A...348..487R
  5. 1 2 Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397
  6. 1 2 3 McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527



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