Eta Eridani
| Data pengamatan Epos J2000.0 Ekuinoks J2000.0 | |
|---|---|
| Rasi bintang | Eridanus |
| Asensio rekta | 02j 56m 25,64948d[1] |
| Deklinasi | −08° 53′ 53,3221″[1] |
| Magnitudo tampak (V) | +3,87[2] |
| Ciri-ciri | |
| Kelas spektrum | K1+ IIIb[3] |
| Indeks warna U−B | _0,98[2] |
| Indeks warna B−V | +1,12[2] |
| Jenis variabel | suspected[4] |
| Astrometri | |
| Kecepatan radial (Rv) | −20,32 km/s |
| Gerak diri (μ) | RA: +77,36 ± 0,19[1] mdb/thn Dek.: −220,16 ± 0,20[1] mdb/thn |
| Paralaks (π) | 23,89±0,19[1] mdb |
| Jarak | 137 ± 1 tc (41,9 ± 0,3 pc) |
| Magnitudo mutlak (MV) | +0,83[5] |
| Detail | |
| Massa | 1,43[6] M☉ |
| Radius | 10,48[6] R☉ |
| Luminositas | 57,5[6] L☉ |
| Gravitasi permukaan (log g) | +2,79[6] |
| Suhu | 4.742[6] K |
| Kecepatan rotasi (v sin i) | 2,34[6] km/s |
| Usia | 2,66[6] gigatahun |
| Penamaan lain | |
| Referensi basis data | |
| SIMBAD | data |
Eta Eridani (η Eri / η Eridani) adalah salah satu bintang di rasi Eridanus. Eta Eridani tergolong bintang kelas K1+ IIIb[3] dan memiliki magnitudo tampak +3,87.[2] Bintang ini berada pada jarak 137,0 tahun cahaya (41,9 parsec) dari Matahari.[1]
Etimologi
Nama tradisional bintang ini adalah Azha, berasal dari bahasa Persia, آشيانه āšiyāne yang berarti "sarang (burung unta)".[8] Nama lainnya untuk bintang ini adalah:
| nama lain | asal bahasa | arti |
|---|---|---|
| 天苑六 / Tiānyuánliù | China | bintang kelima pada rasi Padang Rumput di Langit[9] |
| Al Udḥiyy | Arab | pemimpin di sarang burung unta[10] |
Selain rasi Eridanus,bintang ini juga merupakan anggota dari berbagai rasi, asterisma atau kelompok berikut:
| nama lain | asal bahasa | arti | anggota lain |
|---|---|---|---|
| 天苑 / Tiānyuán | China | Padang Rumput di Langit | γ Eri, π Eri, δ Eri, ε Eri, ζ Eri, π Cet, τ1 Eri, τ2 Eri, τ3 Eri, τ4 Eri, τ5 Eri, τ6 Eri, τ7 Eri, τ8 Eri, τ9 Eri |
| Cītlalmazātl | Aztec | rusa | γ Eri, δ Eri, υ4 Eri+, φ Eri, χ Eri+, τ4 Eri+, ε Eri, υ2 Eri+, 43 Eri+, τ3 Eri+, τ6 Eri+, τ5 Eri+, τ1 Eri+, τ2 Eri, τ9 Eri+, α For, β For, κ For+, χ2 For+, χ1 For+, χ3 For+ |
+ berkemungkinan merupakan anggota
Referensi
- ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ a b c d 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.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
- ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ^ Da Silva, L.; Girardi, L.; Pasquini, L.; Setiawan, J.; von Der Lühe, O.; De Medeiros, J. R.; Hatzes, A.; Döllinger, M. P.; Weiss, A. (2006). "Basic physical parameters of a selected sample of evolved stars". Astronomy and Astrophysics. 458 (2): 609. arXiv:astro-ph/0608160. Bibcode:2006A&A...458..609D. doi:10.1051/0004-6361:20065105.
- ^ a b c d e f g Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; de la Villarmois, E. Artur; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics. 574: A50. arXiv:1410.6422. Bibcode:2015A&A...574A..50J. doi:10.1051/0004-6361/201424474.
- ^ "Naming Stars". IAU.org. Diakses tanggal 16 December 2017.
- ^ "biology - List of stars by constellation". Diarsipkan dari asli tanggal 2007-09-27. Diakses tanggal 2009-08-27.
- ^ salah satu rasi bintang menurut bangsa Cina
- ^ http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Eridanus*.html
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