Alpha Centauri
Alpha Centauri (α Cen / α Centauri); (takana juo sabagai Rigil Kentaurus, Rigil Kent, atau Toliman) adolah bintang nan tadokek dari sistem tata surya kito dan paliang corah dalam rasi Sentaurus. Walaupun tampak saparti ciek titiak dicaliak dangan mato talanjang, bintang iko saboneghnyo adolah sistem tigo bintang.
 Lotak Alpha Centauri, basamo dangan Beta Centauri manjadi "panunjuak" untuak rasi Tando Tambah Salatan. Bawah: bintang Alpha Centauri | |
| Data pangamatan Epos J2000 Ekuinoks J2000 | |
|---|---|
| Rasi bintang | Sentaurus |
| Asensio rekta | 14j 39m 36.5/35.1d |
| Deklinasi | -60° 50′ 02.3/13.8″ |
| Magnitudo tampak (V) | -0.01/+1.34/+11.05 |
| Ciri-ciri | |
| Kelas spektrum | G2 V/K1 V/M5.5 Ve |
| Indeks warno U−B | 0.24/0.64/1.54 |
| Indeks warno B−V | 0.65/0.85/1.97 |
| Jinih variabel | Indak ado |
| Astrometri | |
| Kacapatan radial (Rv) | -21.6 km/s |
| Garak diri (μ) | RA: -3678.19 mdb/thn Dek.: 481.84 mdb/thn |
| Paralaks (π) | 747,23±1,17 mdb |
| Jarak | 4,365 ± 0,007 tc (1,338 ± 0,002 pc) |
| Magnitudo mutlak (MV) | 4.38/5.71/15.49 |
| Detail | |
| Massa | 1.100/0.907/0.1 M☉ |
| Radius | 1.227/0.865/0.2 R☉ |
| Luminositas | 1.519/0.500/0.00006 L☉ |
| Gravitasi parmukaan (log g) | 4.30/4.37[1] |
| Suhu | 5,800/5,300/2700 K |
| Metalisitas | 130-230% Sun |
| Rotasi | ? |
| Usia | 5-6 × 109 tahun |
| Orbit bintang gando visual | |
| Bintang sekunder | Alpha Centauri B |
| Pariode (P) | 79.24 tahun |
| Sumbu semi-mayor (a) | 17.59" |
| Eksentrisitas (e) | 0.516 |
| Inklinasi (i) | 79.24° |
| Bujur node (Ω) | 204.87° |
| Epoch periastron (T) | 1955.56 |
| Referensi basis data | |
| SIMBAD | data |
| ARICNS | data |
| Panamoan lain | |
| Referensi basis data | |
| SIMBAD | data |
Rujuakan
suntiang- ↑ Gilli, G.; Israelian, G.; Ecuvillon, A.; Santos, N. C.; Mayor, M. (2006). "Abundances of Refractory Elements in the Atmospheres of Stars with Extrasolar Planets". Astronomy and Astrophysics. 449 (2): 723–736. Diakses tanggal 2007-06-01.
Pautan lua
suntiang| Ado kategori tantang Alpha Centauri di Wikimedia Commons |
Media tantang Alpha Centauri di Wikimedia Commons- SIMBAD observational data
- Sixth Catalogue of Orbits of Visual Binary Stars U.S.N.O.
- The Imperial Star – Alpha Centauri
- Alpha Centauri – A Voyage to Alpha Centauri
- Immediate History of Alpha Centauri
- eSky: Alpha Centauri
Hypothetical planets or exploration
suntiang- "A Family Portrait of the Alpha Centauri System". European Southern Observatory Press Release: 5. 2003. Bibcode:2003eso..pres....7. Diakses tanggal 18 November 2021.[pranala nonaktif permanen]
- Alpha Centauri System
- O Sistema Alpha Centauri (Portuguese) Archived 3 March 2016[Date mismatch] di Wayback Machine.
- Alpha Centauri – Associação de Astronomia (Portuguese)
- Thompson, Andrea (7 Maret 2008). "Nearest Star System Might Harbor Earth Twin". Space.com. Diarsipkan dari versi asli tanggal 2 Juni 2008. Diakses tanggal 18 November 2021.