Kappa Delphini
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 39m 07.78430s |
| Declination | +10° 05′ 10.3383″ |
| Apparent magnitude (V) | 5.07 |
| Characteristics | |
| Spectral type | G1IV + ? + K2IV |
| U−B color index | 0.235 |
| B−V color index | 0.702±0.013 |
| Variable type | Constant |
| Astrometry | |
| Radial velocity (Rv) | −53.51 km/s |
| Proper motion (μ) | RA: 317.681 mas/yr Dec.: 32.566 mas/yr |
| Parallax (π) | 33.3213±0.0782 mas |
| Distance | 97.9 ± 0.2 ly (30.01 ± 0.07 pc) |
| Absolute magnitude (MV) | 2.7 |
| Orbit | |
| Period (P) | 45±5 yr |
| Semi-major axis (a) | 0.520±0.030″ |
| Eccentricity (e) | 0.8±0.4 |
| Inclination (i) | 107±18° |
| Longitude of the node (Ω) | 326±17° |
| Periastron epoch (T) | B 1971.2±1.8 |
| Argument of periastron (ω) (secondary) | 8±34° |
| Details | |
| κ Del Aa | |
| Mass | 1.43 M☉ |
| Luminosity | 8.3 L☉ |
| Surface gravity (log g) | 3.69 cgs |
| Temperature | 5,643 K |
| Metallicity [Fe/H] | +0.01 dex |
| Rotational velocity (v sin i) | 1.77 km/s |
| Age | 3.1 Gyr |
| κ Del Ab | |
| Mass | 0.4±0.2 M☉ |
| Other designations | |
| κ Del, 7 Delphini, BD+09°4600, FK5 772, GC 28756, HD 196755, HIP 101916, HR 7896, SAO 126059, CCDM J20392+1005A, WDS J20391+1005A | |
| Database references | |
| SIMBAD | data |
Kappa Delphini is a binary star system in the constellation Delphinus. Its name is a Bayer designation that is Latinized from κ Delphini and abbreviated as kappa Del or κ Del. This system is faintly visible to the naked eye as a point of light with an apparent magnitude of 5.07. It is located about 97.9 light-years (30.0 pc) away, based on its parallax.
Kappa Delphini is an astrometric binary. The primary star is an early G-type subgiant star. It has a mass 1.61 times that of the Sun, and is 6.8 times more luminous. The companion star regularly perturbs the G-type primary star primary, causing it to wobble around the barycenter. From this, an orbital period of 45 years has been calculated. The secondary star is a low-mass star, at only 0.4 M☉.
A third star is 12th magnitude ADS 14101 B at an angular separation of 10″ as of 2001, but it is a background object. HD 196794 is an 8th magnitude K2 subgiant, 214″ away in the sky, being at the same distance as κ Delphini and sharing a common proper motion.
References
- 1 2 3 4 5 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. XHIP record for this object at VizieR.
- 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ↑ Eggl, S.; et al. (2012). "Circumstellar habitable zones of binary-star systems in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 428 (4): 3104. arXiv:1210.5411. Bibcode:2013MNRAS.428.3104E. doi:10.1093/mnras/sts257.
- ↑ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- 1 2 "* kap Del". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 December 2016.
- 1 2 3 4 5 6 Gontcharov, G. A.; Kiyaeva, O. V. (2010). "Photocentric orbits from a direct combination of ground-based astrometry with Hipparcos II. Preliminary orbits for six astrometric binaries". New Astronomy. 15 (3): 324–331. arXiv:1606.08182. Bibcode:2010NewA...15..324G. doi:10.1016/j.newast.2009.09.006. S2CID 119252073.
- ↑ Niedzielski, A.; et al. (2016). "The Penn State - Toruń Centre for Astronomy Planet Search stars". Astronomy and Astrophysics. 585: A73. Bibcode:2016A&A...585A..73N. doi:10.1051/0004-6361/201527362.
