Delta Geminorum

Delta Geminorum
Diagram showing star positions and boundaries of the Gemini constellation and its surroundings

Lokasi δ Geminorum (dilingkari)
Data pengamatan
Epos J2000      Ekuinoks J2000
Rasi bintang Gemini
Asensio rekta  07j 20m 07.37978d[1]
Deklinasi  +21° 58′ 56.3377″[1]
Magnitudo tampak (V) +3,53[2]
Ciri-ciri
Kelas spektrum F0 IV[3]
Indeks warna U−B +0,04[2]
Indeks warna B−V +0,34[2]
Astrometri
Kecepatan radial (Rv)+4,1[4] km/s
Gerak diri (μ) RA: –15,13[1] mdb/thn
Dek.: –9,79[1] mdb/thn
Paralaks (π)53,94±0,66[1] mdb
Jarak60,5 ± 0,7 tc
(18,5 ± 0,2 pc)
Magnitudo mutlak (MV)1,95[5]
Detail
Massa1,57[6] M☉
Suhu6900[7] K
Metalisitas [Fe/H]–0,26[7]
Kecepatan rotasi (v sin i)129,7[8] km/s
Usia1,6[7] gigatahun
Penamaan lain
Wasat, 55 Geminorum, BD+22° 1645, FK5 279, Gl 271, HD 56986, HIP 35550, HR 2777, SAO 79294.[3]
Referensi basis data
SIMBADdata

Delta Geminorum (δ Gem / δ Geminorum) adalah salah satu bintang di rasi Gemini. Sebenarnya, bintang ini adalah bintang ganda, yang lebih dingin dari Matahari dan tergolong kelas F0 IV.[3] Bintang ini tidak tergolong cerah meskipun telah menggunakan teleskop. Periode orbit bintang ini adalah sekitar 1200 tahun. [1] Diarsipkan 2008-12-02 di Wayback Machine.. Bintang ini bermagnitudo tampak +3,53[2] dan berada pada jarak 59 tahun cahaya dari Bumi.

Etimologi

Bintang ini sering disebut dengan nama tradisionalnya, yaitu Wasat. Nama ini berasal dari bahasa Arab yang berarti "tengah", namun tidak mewakili posisinya yang agak condong ke rasi Orion. Nama lainnya untuk bintang ini adalah:

nama lain asal bahasa arti
天樽二 / Tiānzūnèr China bintang kelima di rasi Cangkir Anggur di Langit[9]
天樽距星 / Tiānzūnjùxīng China bintang yang terpencil di rasi Cangkir Anggur di Langit[10]
天樽西星 / Tiānzūnxīxīng China bintang di barat rasi Cangkir Anggur di Langit[10]
Ta Tsun China cangkir anggur[11]

Lokasi

Gemini Constellation

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:0708.1752 alt=Dapat diakses gratis, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 
  2. ^ a b c d 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 c "Delta Geminorum (Wasat)", SIMBAD, Centre de Données astronomiques de Strasbourg, diakses tanggal 2011-06-03 
  4. ^ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick, ed., The Revision of the General Catalogue of Radial Velocities, University of Toronto: International Astronomical Union, diakses tanggal 2009-09-10 
  5. ^ Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399 alt=Dapat diakses gratis, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911. 
  6. ^ Shaya, Ed J.; Olling, Rob P. (January 2011), "Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue", The Astrophysical Journal Supplement, 192 (1): 2, arXiv:1007.0425 alt=Dapat diakses gratis, Bibcode:2011ApJS..192....2S, doi:10.1088/0067-0049/192/1/2 
  7. ^ a b c Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418: 989–1019, arXiv:astro-ph/0405198 alt=Dapat diakses gratis, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959 
  8. ^ Schröder, C.; Reiners, A.; Schmitt, J. H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377 
  9. ^ salah satu rasi bintang menurut bangsa Cina
  10. ^ a b http://www.chinese-tools.com/tools/sinograms.html
  11. ^ http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Gemini*.html
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