Epsilon Boötis

Epsilon Boötis A/B
Diagram showing star positions and boundaries of the Boötes constellation and its surroundings

Lokasi ε Boötes (dilingkari)
Data pengamatan
Epos J2000      Ekuinoks J2000
Rasi bintang Boötes
Asensio rekta  14j 44m 59.21746d[1]
Deklinasi  +27° 04′ 27.2099″[1]
Magnitudo tampak (V) 2.37[2] / 5.12[3]
Ciri-ciri
Kelas spektrum K0 II-III[4] + A2 V[5]
Indeks warna U−B +0.73[2]
Indeks warna B−V +0.97[2]
Astrometri
Kecepatan radial (Rv)−16.31[6] km/s
Gerak diri (μ) RA: −50.95[1] mdb/thn
Dek.: +21.07[1] mdb/thn
Paralaks (π)16,10±0,66[1] mdb
Jarak203 ± 8 tc
(62 ± 3 pc)
Magnitudo mutlak (MV)−1.61[7]
Detail
A
Massa4.6[8] M
Radius33[6] R
Luminositas501[6] L
Gravitasi permukaan (log g)2.2[6]
Suhu4,550[6] K
Metalisitas–0.13[6]
Kecepatan rotasi (v sin i)10.9[6] km/s
Usia37.4 ± 4.2[9] megatahun
B
Kecepatan rotasi (v sin i)123[10] km/s
Penamaan lain
ε Boo, Izar, Pulcherrima, Mirac, Mirak, Mirach, 36 Boo, BD+27° 2417, HIP 72105[11]
A: HD 129989, HR 5506, SAO 83500.[12]
B: HD 129988, HR 5505.[3]
Referensi basis data
SIMBADdata

Epsilon Boötis (ε Boo / ε Boötis) adalah salah satu bintang di rasi Boötes. Bintang ini merupakan bintang ganda dengan magnitudo 2.35 dan berjarak 210 tahun cahaya.

Etimologi

Bintang ini memiliki nama tradisional Izar atau Pulcherrima.. Nama Izar berasal dari bahasa Arab إزار ’izār, sedangkan Pulcherrima berasal dari bahasa Latin yang berarti "yang tercinta" Nama lain yang diberikan oleh para astronom untuk bintang ini adalah:

nama lain asal bahasa arti
梗河一 / Gěnghéyī China bintang pertama di rasi Lembing di Langit[13]
梗河东星 / Gěnghédōngxīng China bintang di timur rasi Lembing di Langit[14]
Al Minṭakah al ʽAwwāʼ Arab ikat pinggang sang penggembala[15]
Cingulum Latratoris Latin ikat pinggang sang penggembala[16]
Quae in crure dextro juxta cingulum (Almagest) Latin yang di kaki kanan, dekat ikat pinggang (sang penggembala)[16]

Selain rasi Boötes, bintang ini juga merupakan anggota dari berbagai rasi atau asterisma berikut:

nama rasi / asterisma asal arti anggota lainnya
Kite[17] layang-layang α Boo, δ Boo, β Boo, γ Boo, ρ Boo
梗河 / Gěnghé China Lembing di Langit σ Boo, ρ Boo
Al Aulād al Nadhlāt[15] Arab anak dari si kecil ρ Boo, σ Boo, ψ Boo

Referensi

  1. ^ a b c d e van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752alt=Dapat diakses gratis. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99). Bibcode:1966CoLPL...4...99J. 
  3. ^ a b "HR 5506 -- Star in double system", SIMBAD, Centre de Données astronomiques de Strasbourg, diakses tanggal 2012-01-09 
  4. ^ Luck, R. Earle; Wepfer, Gordon G. (November 1995), "Chemical Abundances for F and G Luminosity Class II Stars", Astronomical Journal, 110: 2425, Bibcode:1995AJ....110.2425L, doi:10.1086/117702 
  5. ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819 
  6. ^ a b c d e f g Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209 
  7. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971alt=Dapat diakses gratis, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  8. ^ Gondoin, P. (December 1999), "Evolution of X-ray activity and rotation on G-K giants", Astronomy and Astrophysics, 352: 217–227, Bibcode:1999A&A...352..217G 
  9. ^ Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama mnras410_1_190
  10. ^ Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv:astro-ph/0205255alt=Dapat diakses gratis, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943 
  11. ^ "CCDM J14449+2704AB", SIMBAD, Centre de Données astronomiques de Strasbourg, diakses tanggal 2012-01-09 
  12. ^ "HR 5505 -- Star in double system", SIMBAD, Centre de Données astronomiques de Strasbourg, diakses tanggal 2012-01-09 
  13. ^ salah satu rasi bintang menurut bangsa Cina
  14. ^ http://www.chinese-tools.com/tools/sinograms.html
  15. ^ a b http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Bootes*.html
  16. ^ a b http://id.wikipedia.org/w/index.php?title=Epsilon_Bo%C3%B6tis&action=edit&section=1
  17. ^ "Salinan arsip". Diarsipkan dari versi asli tanggal 2010-01-25. Diakses tanggal 2009-08-11. 


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