Beta Comae Berenices
bintang yang terletak di rasi bintang Coma Berenices
Beta Coma Berenices (β Comae Berenices, β Com) adalah bintang katai di rasi Coma Berenices. Bintang ini berada pada jarak 30 tahun cahaya. Meskipun dinamakan beta, tetapi kenyataaannya bintang ini lebih terang daripada α Com, yaitu bermagnitudo 4.23
 Location of β Coma Bernices (upper left) | |
| Data pengamatan Epos J2000 Ekuinoks J2000 | |
|---|---|
| Rasi bintang | Coma Berenices |
| Asensio rekta | 13j 11m 52.3935d[1] |
| Deklinasi | +27° 52′ 41.459″[1] |
| Magnitudo tampak (V) | 4.26 |
| Ciri-ciri | |
| Kelas spektrum | F9.5V or G0V[butuh rujukan] |
| Indeks warna U−B | 0.07 |
| Indeks warna B−V | 0.57[2] |
| Jenis variabel | None |
| Astrometri | |
| Kecepatan radial (Rv) | +6.1[3] km/s |
| Gerak diri (μ) | RA: -801.44[4] mdb/thn Dek.: 882.04[4] mdb/thn |
| Paralaks (π) | 109,54±0,17[4] mdb |
| Jarak | 29,78 ± 0,05 tc (9,13 ± 0,01 pc) |
| Magnitudo mutlak (MV) | 4.45 |
| Detail | |
| Massa | 1.15[5] M☉ |
| Radius | 1.09[5] R☉ |
| Luminositas | 1.42 L☉ |
| Gravitasi permukaan (log g) | 4.38[2] |
| Suhu | 6,029[2] K |
| Metalisitas | [2] |
| Rotasi | ~10 days |
| Kecepatan rotasi (v sin i) | 10[2] km/s |
| Usia | (1.5–2.5) × 109[6] tahun |
| Penamaan lain | |
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Etimologi sunting
Nama lain dari para astronom terdahulu adalah:
| nama lain | asal bahasa | arti |
|---|---|---|
| 周鼎一 / Zhōu dǐngyī | Cina | bintang pertama pada rasi Segitiga Zhou[7] |
Referensi sunting
- ^ a b Perryman, M. A. C.; et al. (1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ a b c d e Mallik, Sushma V. (1998). "Chromospheric activity in cool stars and the lithium abundance". Astronomy and Astrophysics. 338: 623–636. Bibcode:1998A&A...338..623M.
- ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495.....
- ^ a b c van Leeuwen, Floor (2007). Hipparcos, the new Reduction of the Raw data. Astrophysics and Space Science Library. 350. Bibcode:2007A&A...474..653V. ISBN 9781402063411. Note: see VizieR catalogue I/311.
- ^ a b Takeda, G. (2007). "Stellar parameters of nearby cool stars. II. Physical properties of ~1000 cool stars from the SPOCS catalog". Astrophysical Journal Supplement Series. 168: 297–318. Bibcode:2008yCat..21680297T. Note: see VizieR catalogue J/ApJS/168/297.
- ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal. 687 (2): 1264–1293. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785.
- ^ salah satu rasi bintang menurut bangsa Cina