Castor

Castor
Castor se ligging (in die rooi sirkel).
Sterrebeeld	Tweeling
Bayer-naam	Alpha Geminorum
Spektraaltipe	A1V + dM1e[1] + Am + dM1e[1] + dM1e + dM1e[1]
Soort	Veelvoudige ster
Waarnemingsdata (Epog J2000)
Komponent 1	A
Regte klimming	07h 34m 35.863s[2]
Deklinasie	+31° 53′ 17.79″[2]
Skynmagnitude (m)	1,93[2]
Absolute magnitude (M)	0,986[3]
B-V-kleurindeks	+0,03[3]
Komponent 2	B
Regte klimming	07h 34m 36.100s[2]
Deklinasie	+31° 53′ 18.57″[2]
Skynmagnitude (m)	2,97[2]
Absolute magnitude (M)	1,886[3]
B-V-kleurindeks	+0,04[3]
Komponent 3	C
Deklinasie	+31° 53′ 17.8160″[2]
Skynmagnitude (m)	9,83[2]
Absolute magnitude (M)	8,950[4]
B-V-kleurindeks	+1,49[5]
U-B-kleurindeks	+1,04[5]
Besonderhede
Komponent 1	α Gem Aa
Massa (M☉)	2,76[6]
Radius (R☉)	2,4[7]
Temperatuur (K)	10 286[8]
Rotasiespoed (km/s)	18[9]
Metaalinhoud [Fe/H]	0,98[8]
Komponent 2	α Gem Ba
Massa (M☉)	2,98[6]
Radius (R☉)	3,3[7]
Temperatuur (K)	8 842[8]
Rotasiespoed (km/s)	33[9]
Metaalinhoud [Fe/H]	0,45[8]
Komponent 3	α Gem Ca/Cb
Massa (M☉)	0,5992[4]
Radius (R☉)	0,6191[4]
Ligsterkte (L☉)	0,0733[4]
Temperatuur (K)	3 820[4]
Rotasiespoed (km/s)	37[4]
Metaalinhoud [Fe/H]	~0,0[4]
Eienskappe
Ouderdom (jaar)	370 miljoen (α Gem Ca/Cb)[4]
Veranderlikheid	BY Dra[10] (C)
Ander name
66 Geminorum, FK5 287, Gliese 278, HIP 36850, SAO 60198 A: BD+32°1581A, PLX 1785.00, HR 2891, HD 60179 B: BD+32°1581B, HR 2890, HD 60178 C: YY Geminorum, BD +32° 1582
Portaal    Sterrekunde

Castor (ook bekend as Alpha Geminorum of α Gem) is die tweede helderste ster in die sterrebeeld Tweeling (Gemini) en een van die helderste sterre in die naglug. Dit lyk met die blote oog soos ’n enkelster, maar is eintlik ’n sesvoudige stelsel wat bestaan uit drie dubbelsterre, naamlik Castor Aa, Castor Ab, Castor Ba, Castor Bb, Castor Ca en Castor Cb. Hoewel dit die Bayer-aanwysing alpha het, is dit dowwer as β Geminorum (Pollux).

1. ↑ ^{1,0 1,1 1,2} Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. ISSN 0004-6361.
2. ↑ ^{2,0 2,1 2,2 2,3 2,4 2,5 2,6 2,7} Verwysingfout: Invalid <ref> tag; no text was provided for refs named aaa384_180
3. ↑ ^{3,0 3,1 3,2 3,3} Barrado y Navascues, D. (1998). "The Castor moving group. The age of Fomalhaut and VEGA". Astronomy and Astrophysics. 339: 831. arXiv:astro-ph/9905243. Bibcode:1998A&A...339..831B.
4. ↑ ^{4,0 4,1 4,2 4,3 4,4 4,5 4,6 4,7} Torres, Guillermo; Ribas, Ignasi (2002). "Absolute Dimensions of the M‐Type Eclipsing Binary YY Geminorum (Castor C): A Challenge to Evolutionary Models in the Lower Main Sequence". The Astrophysical Journal. 567 (2): 1140–1165. arXiv:astro-ph/0111167. Bibcode:2002ApJ...567.1140T. doi:10.1086/338587. ISSN 0004-637X.
5. ↑ ^{5,0 5,1} Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
6. ↑ ^{6,0 6,1} Verwysingfout: Invalid <ref> tag; no text was provided for refs named mnras389_2_925
7. ↑ ^{7,0 7,1} Verwysingfout: Invalid <ref> tag; no text was provided for refs named aaa402_719
8. ↑ ^{8,0 8,1 8,2 8,3} Verwysingfout: Invalid <ref> tag; no text was provided for refs named apj189_101
9. ↑ ^{9,0 9,1} Verwysingfout: Invalid <ref> tag; no text was provided for refs named aaa463_2_671
10. ↑ Samus, N. N.; Durlevich, O. V. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/gcvs. Oorspronklik in: 2009yCat....102025S. 1: 02025. Bibcode:2009yCat....102025S.