Delta Draconis
| Data pengamatan Epos J2000 Ekuinoks J2000 | |
|---|---|
| Rasi bintang | Draco |
| Asensio rekta | 19j 12m 33.30197d[1] |
| Deklinasi | +67° 39′ 41.5456″[1] |
| Magnitudo tampak (V) | 3.07[2] |
| Ciri-ciri | |
| Kelas spektrum | G9 III[3] |
| Indeks warna U−B | +0.78[2] |
| Indeks warna B−V | +1.00[2] |
| Astrometri | |
| Kecepatan radial (Rv) | +24.8[4] km/s |
| Gerak diri (μ) | RA: +95.74[1] mdb/thn Dek.: +91.92[1] mdb/thn |
| Paralaks (π) | 33,48±0,10[1] mdb |
| Jarak | 97,4 ± 0,3 tc (29,87 ± 0,09 pc) |
| Magnitudo mutlak (MV) | +0.62[5] |
| Detail | |
| Massa | 2.32[5] M☉ |
| Radius | 11[6] R☉ |
| Luminositas | 59[5] L☉ |
| Gravitasi permukaan (log g) | 2.98[7] |
| Suhu | 4,820[7] K |
| Metalisitas [Fe/H] | –0.27[7] |
| Kecepatan rotasi (v sin i) | 8[8] km/s |
| Usia | 0.8[5] gigatahun |
| Penamaan lain | |
| Referensi basis data | |
| SIMBAD | data |
Delta Draconis (δ Dra / δ Draconis) adalah bintang kuning yang berada di rasi Draco. Delta Draconis memiliki magnitudo +3.07 dan termasuk bintang berkelas G9III. Bintang ini berada pada jarak 100 tahun cahaya dari Bumi.
Etimologi
Bintang ini memiliki nama tradisional Aldib.[12] Nama lainnya untuk bintang ini adalah:
| nama lain | asal bahasa | arti |
|---|---|---|
| Altais | Arab | kambing[13] |
| Nodus Secundus | Latin | ikatan kedua[13][14] |
| 天廚一 / Tiānchúyī | China | bintang pertama pada rasi Dapur di Langit[15] |
Selain rasi Draco, bintang ini juga merupakan anggota dari berbagai rasi atau asterisma berikut:
| nama rasi / asterisma | asal | arti | anggota lainnya |
|---|---|---|---|
| 天廚 / Tiānchú | China | Dapur di Langit | σ Dra, ε Dra, ρ Dra, 64 Dra, π Dra |
| Al Tāis[13] | Arab | kambing | ε Dra, ρ Dra, π 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 Johnson, H. L.; Mitchell; Iriarte; Wisniewski (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
- ^ Roman, Nancy G. (July 1952). "The Spectra of the Bright Stars of Types F5-K5". Astrophysical Journal. 116: 122. Bibcode:1952ApJ...116..122R. doi:10.1086/145598.
- ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
- ^ a b c d Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781
- ^ The Sun has a radius of 0.004652 AU. Thus: See: Lochner, Jim; Gibb, Meredith; Newman, Phil (January 30, 2006). "Using Optical Observations to find the Diameter of HT Cas". NASA. Diarsipkan dari asli tanggal 2010-06-01. Diakses tanggal 2010-04-06.
- ^ a b c McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". Astrophysical Journal Supplement Series. 74: 1075–1128. Bibcode:1990ApJS...74.1075M. doi:10.1086/191527.
- ^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago. 239 (1): 1. Bibcode:1970CoAsi.239....1B.
- ^ Bakich, Michael E. (1995). The Cambridge guide to the constellations. Cambridge University Press. hlm. 184. ISBN 0-521-44921-9.
- ^ Kaler, James B. "Nodus Secundus". STARS. University of Illinois. Diakses tanggal 2010-04-06.
- ^ "del Dra -- Star in double system". SIMBAD. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2010-04-06.
- ^ Atlas of the Heavens, part II, catalogue, Antonín Bečvář
- ^ a b c http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Draco*.html
- ^ rasi ini memiliki empat simpul
- ^ salah satu rasi bintang menurut bangsa Cina
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