Kappa Delphini

κ Delphini
Diagram showing star positions and boundaries of the Delphinus constellation and its surroundings


Location of κ Delphini (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Delphinus
Right ascension 20h 39m 07.78430s[1]
Declination +10° 05 10.3383[1]
Apparent magnitude (V) 5.05[2]
Characteristics
Spectral type G1IV + ? + K2IV[3]
U−B color index 0.235[4]
B−V color index 0.69[4]
Astrometry
Radial velocity (Rv)-53.51[2] km/s
Proper motion (μ) RA: 323.83[1] mas/yr
Dec.: 21.80[1] mas/yr
Parallax (π)33.20 ± 0.28[1] mas
Distance98.2 ± 0.8 ly
(30.1 ± 0.3 pc)
Absolute magnitude (MV)2.7[5]
Orbit[5]
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°
Other designations
κ Del, 7 Del, BD+09° 4600, HD 196755, HIP 101916, HR 7896, SAO 126059, CCDM J20392+1005A, WDS J20391+1005A[2]
Database references
SIMBADdata

κ Delphini (Latinised as Kappa Delphini, abbreviated to κ Del or kappa Del) is a binary star system in the constellation Delphinus. It is faintly visible to the naked eye, with an apparent magnitude of 5.05.[2] It is located about 98.2 light-years away, based on its parallax.[1]

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.[5] The secondary star is a low-mass star, at only 0.4 M.[5] A third star, designated ADS 14101 B, is a K-type subgiant, and may be physically associated.[5]

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 3 4 "* kap Del". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 December 2016.
  3. Eggl, S.; Pilat-Lohinger, E.; Funk, B.; Georgakarakos, N.; Haghighipour, N. (2012). "Circumstellar habitable zones of binary-star systems in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 428 (4): 3104. Bibcode:2013MNRAS.428.3104E. arXiv:1210.5411Freely accessible. doi:10.1093/mnras/sts257.
  4. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M.
  5. 1 2 3 4 5 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. Bibcode:2010NewA...15..324G. arXiv:1606.08182Freely accessible. doi:10.1016/j.newast.2009.09.006.


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