HD 216718

HD 216718
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	22h 55m 10.96166s
Declination	−04° 59′ 16.4546″
Apparent magnitude (V)	5.72 (6.03 + 7.75)
Characteristics
Spectral type	K0III-IV
U−B color index	+0.60
B−V color index	+0.88
Astrometry
Radial velocity (Rv)	−7.06±0.13 km/s
Proper motion (μ)	RA: +29.88 mas/yr ; Dec.: −10.78 mas/yr
Parallax (π)	11.99±0.65 mas
Distance	270 ± 10 ly ; (83 ± 5 pc)
Absolute magnitude (MV)	+1.12
Orbit
Period (P)	96.48 yr
Semi-major axis (a)	0.4810″
Eccentricity (e)	0.6430
Details
Surface gravity (log g)	3.16 cgs
Temperature	5,080 K
Metallicity [Fe/H]	0.04 dex
Rotational velocity (v sin i)	0.0 km/s
Other designations
	BU 718, 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

^ ^a ^b 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.
^ ^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
^ ^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
^ ^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
^ Randich, S.; et al. (August 1999), "Lithium in population I subgiants", Astronomy and Astrophysics, 348: 487–500, Bibcode:1999A&A...348..487R
^ ^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
^ ^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

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[xhip-1] 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.

[van_Leeuwen2007-2] 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

[aass34_1-3] 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

[aa546_A69_5-4] 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

[aaa348_487-5] Randich, S.; et al. (August 1999), "Lithium in population I subgiants", Astronomy and Astrophysics, 348: 487–500, Bibcode:1999A&A...348..487R

[aj135_1_209-6] 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

[apjss74-7] 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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Observation data Epoch J2000 Equinox J2000
Constellation	Aquarius^[1]
Right ascension	22^h 55^m 10.96166^s^[2]
Declination	−04° 59′ 16.4546″
Apparent magnitude (V)	5.72^[3] (6.03 + 7.75)^[4]
Characteristics
Spectral type	K0III-IV^[5]
U−B color index	+0.60^[3]
B−V color index	+0.88^[3]
Astrometry

Radial velocity (R_v)	−7.06±0.13^[6] km/s
Proper motion (μ)	RA: +29.88^[2] mas/yr Dec.: −10.78^[2] mas/yr
Parallax (π)	11.99±0.65 mas^[2]
Distance	270 ± 10 ly (83 ± 5 pc)
Absolute magnitude (M_V)	+1.12^[1]

Orbit^[4]
Period (P)	96.48 yr
Semi-major axis (a)	0.4810″
Eccentricity (e)	0.6430
Details

Surface gravity (log g)	3.16^[7] cgs
Temperature	5,080^[7] K
Metallicity [Fe/H]	0.04^[7] dex
Rotational velocity (v sin i)	0.0^[6] km/s

Other designations
BU 718, BD−05°5885, HD 216718, HIP 113184, HR 8716, SAO 146388
Database references
SIMBAD	data