36 Draconis

36 Draconis is a star in the northern constellation Draco. It is faintly visible to the naked eye with an apparent visual magnitude of 4.99.[2] Based upon an annual parallax shift of 43.63[1] mas, it is located about 74.8 light years away. At that distance, the visual magnitude is diminished by an extinction of 0.129 due to interstellar dust.[2] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.353 arc seconds per year.[7] It is moving closer to the Sun with a radial velocity of −35.6 km/s.[3]

36 Draconis
Observation data
Epoch J2000      Equinox
Constellation Draco
Right ascension  18h 13m 53.83332s[1]
Declination +64° 23′ 50.2330″[1]
Apparent magnitude (V) 4.99[2]
Characteristics
Spectral type F5 V[3] + M3[4]
B−V color index +0.40[3]
Astrometry
Radial velocity (Rv)−35.6[3] km/s
Proper motion (μ) RA: +351.73[1] mas/yr
Dec.: +351.73[1] mas/yr
Parallax (π)43.63 ± 0.17[1] mas
Distance74.8 ± 0.3 ly
(22.92 ± 0.09 pc)
Absolute magnitude (MV)3.14[3] + 7.4[4]
Details[2]
Mass1.23±0.15 M☉
Radius1.635±0.037 R☉
Luminosity4.66±0.12 L☉
Surface gravity (log g)4.1±0.5 cgs
Temperature6,638±83 K
Metallicity [Fe/H]−0.3±0.1 dex
Rotational velocity (v sin i)8[3] km/s
Age2.95[5] Gyr
Other designations
36 Dra, BD+64° 1252, FK5 685, GJ 9619, HD 168151, HIP 89348, HR 6850, SAO 17828[6]
Database references
SIMBADdata

This is an ordinary F-type main-sequence star with a stellar classification of F5 V.[3] It has 1.23 times the mass of the Sun and 1.64 times the Sun's radius.[2] The star is around three[5] billion years old and is spinning with a projected rotational velocity of 8 km/s.[3] It is radiating 4.7 times the Sun's luminosity from its photosphere at an effective temperature of 6,638 K.[2]

Observations carried out in 2010 and 2012 detected a faint companion at an angular separation of 3.3 arcseconds. Judging by the age and magnitude, this is a red dwarf of class M3.[4]

References
  1. van Leeuwen, F. (November 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.
  2. Ligi, R.; et al. (February 2016), "Radii, masses, and ages of 18 bright stars using interferometry and new estimations of exoplanetary parameters", Astronomy & Astrophysics, 586: 23, arXiv:1511.03197, Bibcode:2016A&A...586A..94L, doi:10.1051/0004-6361/201527054, A94.
  3. Takeda, Yoichi; et al. (February 2005), "High-Dispersion Spectra Collection of Nearby F-K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards", Publications of the Astronomical Society of Japan, 57 (1): 13–25, Bibcode:2005PASJ...57...13T, doi:10.1093/pasj/57.1.13.
  4. Rodriguez, David R.; et al. (May 2015), "Stellar multiplicity and debris discs: an unbiased sample", Monthly Notices of the Royal Astronomical Society, 449 (3): 3160–3170, arXiv:1503.01320, Bibcode:2015MNRAS.449.3160R, doi:10.1093/mnras/stv483.
  5. Takeda, Yoichi (April 2007), "Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database", Publications of the Astronomical Society of Japan, 59 (2): 335–356, Bibcode:2007PASJ...59..335T, doi:10.1093/pasj/59.2.335.
  6. "36 Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-27.
  7. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.
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