Beta Hydrae

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β Hydrae
Data pengamatan
Epoch J2000.0      Equinox J2000.0 (ICRS)
Rasi bintang Hydra
Komponen A B
Asensio rekta  11j 52m  11j 52m
  54.521s 54.550s
Deklinasi  −33° 54′[1]  −33° 54′[2]
  29.25″ 28.73″
Magnitudo semu (V) 4.67[3] 5.47[3]
  4.276(combined)[4]
Karakteristik
Klasifikasi bintang B9IIIsp...[4]
U-B Indeks warna −0.33[5]
B-V Indeks warna −0.10[5]
R-I Indeks warna −0.08[5]
Variable type ACV[6]
Astrometri
Kecepatan radial (Rv) −1 ± 5[4] km/s
Gerak diri:  
RA α cos δ)  −58.02 [1] m.b/thn  −52.70[2] m.b/thn 
Dec. δ)  2.40[1]&nbspm.b/thn  −8.94[2]&nbspm.b/thn 
Paralaks (π) 8.93 ± 0.88[4] m.b
Jarak 370 ± 40 tc
(110 ± 10 pc)
Magnitudo mutlak (MV) −1.0[7]
Details
Massa 3.36 ± 0.15[8] M ~3[9] M
Radius 4.0 ± 0.6[8] R
Luminositas (bolometriks) 210[9] L
Temperatur 11,100[8] K
Umur 2.2 × 108 [9]thn
Referensi Database
SIMBAD data
Nama lain
β Hya, Beta Hydrae, Beta Hya, HJ 4478AB, CCDM J11529-3354AB, CD−33 8018, CPD−33 3159, GC 16258, HD 103192, HIP 57936, HR 4552, IDS 11479-3321 AB, PPM 289465, SAO 202901, WDS 11529-3354AB.[4][3]

Beta Hydrae (Beta Hya, β Hydrae, β Hya) adalah bintang ganda yang ada di rasi bintang Hydra.[4] Secara umum, magnitudonya bervariasi sebesar 0.04 magnitudo dengan periode 2.344 hari, dan pada saat paling terang magnitudoya sekitar 4.27.[10] Bintang yang paling terang adalah bintang raksasa Bp yang diklasifikasikan sebagai α² Canum Venaticorum.[4][6]

Referensi[sunting | sunting sumber]

  1. ^ a b c HIP 57936, record for component 1, Hipparcos catalogue; CDS ID I/239.
  2. ^ a b c HIP 57936, record for component 2, Hipparcos catalogue; CDS ID I/239.
  3. ^ a b c Entry 11529-3354, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line September 23, 2008.
  4. ^ a b c d e f g V* alf Dor -- Variable Star, database entry, SIMBAD. Accessed on line September 3, 2008.
  5. ^ a b c HR 4552, 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 23, 2008.
  6. ^ a b Notes, Entry 11529-3354, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line September 23, 2008.
  7. ^ Dari magnitudo semu dan paralaks.
  8. ^ a b c North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N 
  9. ^ a b c Beta Hydrae, Stars, Jim Kaler. Accessed on line September 23, 2008.
  10. ^ bet Hya, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 23, 2008.