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Alpha Doradus
Lokasi α Doradus (lingkaran) | Data pengamatan
Epoch J2000.0 Equinox J2000.0 (ICRS) | | Rasi bintang | Dorado | | Komponen | A | B | | Asensio rekta | 04j 33m | 04j 33m | | | 59.778s | 59.782s | | Deklinasi | −55° 02′[1] | −55° 02′[2] | | | 41.91″ | 42.39″ | | Magnitudo semu (V) | 3.8[3] | 4.3[3] | | Karakteristik | | Klasifikasi bintang | A0IIIp[3] | B9IV[3] | | U-B Indeks warna | −0.35[3] | | B-V Indeks warna | −0.10[3] | | R-I Indeks warna | −0.09[3] | | Variable type | ACV[4] | | | Astrometri | | Kecepatan radial (Rv) | 25.6 ± 0.9[5] km/s | | | Gerak diri: | | | RA (μα cos δ) | 58.06[1] m.b/thn | 42.83[2] m.b/thn | | Dec. (μδ) | 12.73[1] m.b/thn | 12.94[2] m.b/thn | | Paralaks (π) | 19.34 ± 0.31[6] m.b | | Jarak | 169 ± 3 tc
(51,7 ± 0,8 pc) | | Details | | Massa | 3.33 ± 0.10[7] M☉ | 2.7[8] M☉ | | Radius | 3.5 ± 0.3[7] R☉ | 1.9[8] R☉ | | Gravitasi permukaan (log g) | 4.02 ± 0.07[7] | | | Luminositas (bolometriks) | 195[7] L☉ | 70[8] L☉ | | Temperatur | 11,588[7] K | 12,200[8] K | | Rotasi | 2.94 days[7] | | | Orbit[9] | | Periode (P) | 12.1 y | | Sumbu semi-mayor (a) | 0.18″ | | Eksentrisitas (e) | 0.80 | | Inklinasi (i) | 31° | | Bujur node menaik (Ω) | 140° | | Periastron epos (T) | B1986 | Argumen periastron (ω)
(secondary) | 193° | | Referensi Database | | SIMBAD | data | | Nama lain | α Dor, Alpha Doradus, Alpha Dor, B 2092, CCDM J04340-5503AB, CD−55 916, CPD−55 663, FK5 171, GC 5600, HD 29305, HIP 21281, HR 1465, IDS 04318-5515 AB, PPM 333592, SAO 233564, WDS 04340-5503AB. [5] |
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Alpha Doradus (Alpha Dor, α Doradus, α Dor) adalah bintang paling terang yang ad di rasi bintang Dorado. Dengan menggunakan sistem paralaks, jarak ke bintang ini dihitung sebesar 169 tahun cahaya (52 parsec).[6]
Bintang ini merupakan sistem bintang biner[8] dengan magnitudo semu bervariasi dari 3.26 - 3.30,[4] membuatnya menjadi bintang biner yang paling terang.[10]
Referensi
- ^ a b c HIP 21281, record for component 1, Hipparcos catalogue; CDS ID I/239.
- ^ a b c HIP 21281, record for component 2, Hipparcos catalogue; CDS ID I/239.
- ^ a b c d e f g HR 1465, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 3, 2008.
- ^ a b alf Dor, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars Diarsipkan 2017-06-20 di Wayback Machine., Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 3, 2008.
- ^ a b V* alf Dor -- Variable Star, database entry, SIMBAD. Accessed on line September 3, 2008.
- ^ a b van Leeuwen, F. (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.
- ^ a b c d e f North, P. (1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv:astro-ph/9802286 , Bibcode:1998A&A...334..181N
- ^ a b c d e Kaler, James B., Stars, diakses tanggal 2012-03-04
- ^ "Entry 04340-5503", Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory, diakses tanggal 2008-09-03
- ^ Heintz, W. D. (1984), "Note on the orbit of alpha Doradus", The Observatory, 104: 88–89, Bibcode:1984Obs...104...88H
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