Beta Hydrae
bintang yang terletak di rasi bintang Hydra
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]
| 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 (μα cos δ) | −58.02[1] m.b/thn | −52.70[2] m.b/thn |
| Dec. (μδ) | 2.40[1] m.b/thn | −8.94[2] m.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 | ||
Referensi
sunting- ^ a b c HIP 57936, record for component 1, Hipparcos catalogue; CDS ID I/239.
- ^ a b c HIP 57936, record for component 2, Hipparcos catalogue; CDS ID I/239.
- ^ a b c Entry 11529-3354, The Washington Double Star Catalog Diarsipkan 2008-04-13 di Wayback Machine., United States Naval Observatory. Accessed on line September 23, 2008.
- ^ a b c d e f g V* alf Dor -- Variable Star, database entry, SIMBAD. Accessed on line September 3, 2008.
- ^ 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.
- ^ a b Notes, Entry 11529-3354, The Washington Double Star Catalog Diarsipkan 2008-04-13 di Wayback Machine., United States Naval Observatory. Accessed on line September 23, 2008.
- ^ Dari magnitudo semu dan paralaks.
- ^ a b c 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 Beta Hydrae Diarsipkan 2008-09-05 di Wayback Machine., Stars, Jim Kaler. Accessed on line September 23, 2008.
- ^ bet Hya, 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 23, 2008.
