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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
SIMBAD data

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

References

  1. ^ a b c d 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. ^ a b c 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. ^ a b 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. ^ a b 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. ^ a b c 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