Xi Draconis
| Data pengamatan Epos J2000 Ekuinoks J2000 | |
|---|---|
| Rasi bintang | Draco |
| Asensio rekta | 17j 53m 31.72962d[1] |
| Deklinasi | +56° 52′ 21.5143″[1] |
| Magnitudo tampak (V) | 3.75[2] |
| Ciri-ciri | |
| Kelas spektrum | K2 III[3] |
| Indeks warna U−B | +1.21[2] |
| Indeks warna B−V | +1.18[2] |
| Astrometri | |
| Kecepatan radial (Rv) | -26.38 ± 0.20[4] km/s |
| Gerak diri (μ) | RA: 93.82 ± 0.14[1] mdb/thn Dek.: 78.50 ± 0.12[1] mdb/thn |
| Paralaks (π) | 28,98±0,12[1] mdb |
| Jarak | 112,5 ± 0,5 tc (34,5 ± 0,1 pc) |
| Magnitudo mutlak (MV) | +1.06[5] |
| Detail | |
| Massa | 1.45 ± 0.17[6] M☉ |
| Radius | 12[7] R☉ |
| Luminositas | 49 ± 4[6] L☉ |
| Gravitasi permukaan (log g) | 2.3[7] |
| Suhu | 4,445[6] K |
| Metalisitas [Fe/H] | –0.09[7] |
| Kecepatan rotasi (v sin i) | 2.3[7] km/s |
| Penamaan lain | |
| Referensi basis data | |
| SIMBAD | data |
Xi Draconis (ξ Dra / ξ Draconis) adalah salah satu bintang di rasi Draco. Xi Draconis memiliki magnitudo 3.75 dan termasuk pada kelas K2-III. Bintang ini berada pada 111 tahun cahaya dari Bumi.
Etimologi
Bintang ini kadang-kadang disebut juga Grumium yang berarti "rahang sang naga" dalam bahasa Latin dan Nodus Primus yang berarti "ikatan pertama" dalam bahasa Latin. Nama lainnya untuk bintang ini adalah:
| nama lain | asal bahasa | arti |
|---|---|---|
| 天棓一 / Tiānbàngyī | China | bintang pertama pada rasi Alat Pemukul Padi di Langit[8] |
Selain rasi Draco, bintang ini juga merupakan anggota dari berbagai rasi atau asterisma berikut:
| nama rasi / asterisma | asal | arti | anggota lainnya |
|---|---|---|---|
| 天棓 / Tiānbàng | China | Alat Pemukul Padi di Langit | γ Dra, ν Dra, β Dra, ι Her |
| Lozenge[9] | belah ketupat | γ Dra, ν Dra, β Dra | |
| Alwaid | Arab | induk unta | γ Dra, ν Dra, β Dra, μ Dra[10][11] |
| Al Ṣalīb al Wākiʽ[10] | Arab | salib yang terbalik | γ Dra, ν Dra, β Dra, μ Dra |
Referensi
- ^ 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, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- ^ a b c Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants.", Monthly Notices of the Royal Astronomical Society, 172: 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667. Pemeliharaan CS1: DOI bebas tanpa ditandai (link)
- ^ Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29–50, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333.
- ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272.
- ^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv:astro-ph/0409683, Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440.
- ^ a b c Stello, D.; et al. (2008), "Oscillating K Giants with the WIRE Satellite: Determination of Their Asteroseismic Masses", The Astrophysical Journal Letters, 674 (1): L53 – L56, arXiv:0801.2155, Bibcode:2008ApJ...674L..53S, doi:10.1086/528936.
- ^ a b c d 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.
- ^ salah satu rasi bintang menurut bangsa Cina
- ^ "Salinan arsip". Diarsipkan dari asli tanggal 1999-02-02. Diakses tanggal 2009-08-14.
- ^ a b http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Draco*.html
- ^ asterisma ini disebut juga Quinque Dromedarii
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