Astronomy:HD 216718
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Short description: Binary star system in the constellation Aquarius
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 |
HD 216718 is a binary star system in the equatorial constellation of Aquarius.
References
- ↑ 1.0 1.1 1.2 1.3 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 2.0 2.1 2.2 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
- ↑ 3.0 3.1 Malkov, O. Yu. et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics 546: 5, doi:10.1051/0004-6361/201219774, A69, Bibcode: 2012A&A...546A..69M
- ↑ Randich, S. et al. (August 1999), "Lithium in population I subgiants", Astronomy and Astrophysics 348: 487–500, Bibcode: 1999A&A...348..487R
- ↑ 5.0 5.1 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M
- ↑ 6.0 6.1 6.2 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, doi:10.1086/191527, Bibcode: 1990ApJS...74.1075M
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