HD 216718
HD 216718 is a binary star system in the equatorial constellation of Aquarius.
| 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] |
| Distance | 270 ± 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 |
| Temperature | 5,080[6] K |
| Metallicity [Fe/H] | 0.04[6] dex |
| Rotational velocity (v sin i) | 0.0[5] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
- 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
- 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
- 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
- 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
- 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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