Astronomy:36 Draconis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| Distance | 74.8 ± 0.3 ly (22.92 ± 0.09 pc) |
| Absolute magnitude (MV) | 3.14[3] + 7.4[4] |
| Details[2] | |
| Mass | 1.23±0.15 M☉ |
| Radius | 1.635±0.037 R☉ |
| Luminosity | 4.66±0.12 L☉ |
| Surface gravity (log g) | 4.1±0.5 cgs |
| Temperature | 6,638±83 K |
| Metallicity [Fe/H] | −0.3±0.1 dex |
| Rotational velocity (v sin i) | 8[3] km/s |
| Age | 2.95[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 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 2.3 2.4 2.5 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, doi:10.1051/0004-6361/201527054, A94, Bibcode: 2016A&A...586A..94L.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 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, doi:10.1093/pasj/57.1.13, Bibcode: 2005PASJ...57...13T.
- ↑ 4.0 4.1 4.2 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, doi:10.1093/mnras/stv483, Bibcode: 2015MNRAS.449.3160R.
- ↑ 5.0 5.1 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, doi:10.1093/pasj/59.2.335, Bibcode: 2007PASJ...59..335T.
- ↑ "36 Dra". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=36+Dra.
- ↑ 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, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L.
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