Summary
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]
| 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 mas[1] |
| 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 |
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 edit
- ^ a b c d e f 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, S2CID 18759600.
- ^ a b c d e f 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, S2CID 15941645, A94.
- ^ a b c d e f g h 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.
- ^ a b c 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, S2CID 119237891.
- ^ a b 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.
- ^ "36 Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-27.
- ^ 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, S2CID 2603568.