Beta Equulei
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Equuleus |
| Right ascension | 21h 22m 53.61344s[1] |
| Declination | +06° 48′ 40.1070″[1] |
| Apparent magnitude (V) | 5.15[2] |
| Characteristics | |
| Spectral type | A3 V[3] |
| U−B color index | +0.10[2] |
| B−V color index | +0.04[2] |
| Astrometry | |
| Radial velocity (Rv) | −11.1±0.8[4] km/s |
| Proper motion (μ) | RA: −26.61[1] mas/yr Dec.: +38.21[1] mas/yr |
| Parallax (π) | 24.55 ± 0.81[1] mas |
| Distance | 133 ± 4 ly (41 ± 1 pc) |
| Details | |
| Radius | 4.02[5] R☉ |
| Temperature | 9,000[5] K |
| Rotational velocity (v sin i) | 58.0±0.7[3] km/s |
| Age | 600[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Beta Equulei (Beta Equ, β Equulei, β Equ) is the Bayer designation for a solitary[7] star in the northern constellation of Equuleus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.15.[2] The annual parallax shift is 24.55 mas,[1] indicating a separation of around 133 light years from the Sun.
This is an ordinary A-type main sequence star with a stellar classification of A3 V.[3] It has about four times the radius of the Sun and an effective temperature of about 9,000 K.[5] The star is around 600[5] million years old and is spinning with a projected rotational velocity of 58 km/s.[3] The star emits an infrared excess indicating the presence of a dusty debris disk. The mean temperature of the dust is 85 K, indicating the semimajor axis of its orbit is 104 AU.[5]
β Equulei has four optical companions. They are not physically associated with the star described above.[8]
References
- 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:0708.1752
, doi:10.1051/0004-6361:20078357. - 1 2 3 4 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M.
- 1 2 3 4 Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, Bibcode:2011A&A...531A.143D, arXiv:1012.4858 , doi:10.1051/0004-6361/201016386.
- ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
- 1 2 3 4 5 6 Rhee, Joseph H.; et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs", The Astrophysical Journal, 660 (2): 1556–1571, Bibcode:2007ApJ...660.1556R, arXiv:astro-ph/0609555 , doi:10.1086/509912.
- ↑ "bet Equ -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-02-17.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.
- ↑ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
External links
- Kaler, James B. (December 18, 2009), "Beta Equulei", Stars, University of Illinois.