Alpha Equulei: Perbedaan antara revisi
Tag: Suntingan perangkat seluler Suntingan peramban seluler |
k Bot: Perubahan kosmetika |
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Baris 18: | Baris 18: | ||
| dec = {{DEC|+5|14|52.2430}}<ref name="van Leeuwen2007"/> |
| dec = {{DEC|+5|14|52.2430}}<ref name="van Leeuwen2007"/> |
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| appmag_v = +3,919<ref name=cousins>{{cite journal|bibcode=1984SAAOC...8...59C|title=Standardization of Broadband Photometry of Equatorial Standards|journal=South African Astronomical Observatory Circulars|volume=8|pages=59|author1=Cousins|first1=A. W. J.|year=1984}}</ref> |
| appmag_v = +3,919<ref name=cousins>{{cite journal|bibcode=1984SAAOC...8...59C|title=Standardization of Broadband Photometry of Equatorial Standards|journal=South African Astronomical Observatory Circulars|volume=8|pages=59|author1=Cousins|first1=A. W. J.|year=1984}}</ref> |
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{{Starbox character |
{{Starbox character |
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| class = G7III + kA3hA4mA9<ref name=griffin/> |
| class = G7III + kA3hA4mA9<ref name=griffin/> |
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Baris 24: | Baris 24: | ||
| u-b = +0,284<ref name=cousins/> |
| u-b = +0,284<ref name=cousins/> |
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| variable= |
| variable= |
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}} |
}} |
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{{Starbox astrometry |
{{Starbox astrometry |
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| radial_v = |
| radial_v = −15,71 ± 0,05<ref name=griffin/> |
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| prop_mo_ra = {{nowrap|+59,88 ± 0,23<ref name="van Leeuwen2007"/>}} |
| prop_mo_ra = {{nowrap|+59,88 ± 0,23<ref name="van Leeuwen2007"/>}} |
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| prop_mo_dec = {{nowrap|−94,09 ± 0,18<ref name="van Leeuwen2007"/>}} |
| prop_mo_dec = {{nowrap|−94,09 ± 0,18<ref name="van Leeuwen2007"/>}} |
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Baris 34: | Baris 34: | ||
| dist_pc = |
| dist_pc = |
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| absmag_v = +0,17 (0,71 + 1,18)<ref name=griffin/> |
| absmag_v = +0,17 (0,71 + 1,18)<ref name=griffin/> |
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}} |
}} |
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{{Starbox orbit |
{{Starbox orbit |
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| reference = <ref name=griffin>{{cite journal|bibcode=2002MNRAS.330..288G|title=Composite spectra Paper 11: α Equulei, an astrometric binary with an Am secondary|journal=Monthly Notices of the Royal Astronomical Society|volume=330|issue=2|pages=288|author1=Griffin|first1=R. E. M.|last2=Griffin|first2=R. F.|year=2002|doi=10.1046/j.1365-8711.2002.05030.x}}</ref> |
| reference = <ref name=griffin>{{cite journal|bibcode=2002MNRAS.330..288G|title=Composite spectra Paper 11: α Equulei, an astrometric binary with an Am secondary|journal=Monthly Notices of the Royal Astronomical Society|volume=330|issue=2|pages=288|author1=Griffin|first1=R. E. M.|last2=Griffin|first2=R. F.|year=2002|doi=10.1046/j.1365-8711.2002.05030.x}}</ref> |
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Baris 57: | Baris 57: | ||
| temperature2 = 8.150<ref name=griffin/> |
| temperature2 = 8.150<ref name=griffin/> |
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| age_myr2 =740<ref name=griffin/> |
| age_myr2 =740<ref name=griffin/> |
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}} |
}} |
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{{Starbox catalog |
{{Starbox catalog |
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| names = Kitalphar, [[Flamsteed designation|8]] Equulei, [[Bright Star Catalogue|HR]] 8131, [[Henry Draper Catalogue|HD]] 202447, [[Bonner Durchmusterung|BD]] +04 4635, [[Hipparcos catalogue|HIP]] 104987, [[Smithsonian Astrophysical Observatory Star Catalogue|SAO]] 126662, [[Fifth Fundamental Catalogue|FK5]] 800, [[Boss General Catalogue|GC]] 29735 |
| names = Kitalphar, [[Flamsteed designation|8]] Equulei, [[Bright Star Catalogue|HR]] 8131, [[Henry Draper Catalogue|HD]] 202447, [[Bonner Durchmusterung|BD]] +04 4635, [[Hipparcos catalogue|HIP]] 104987, [[Smithsonian Astrophysical Observatory Star Catalogue|SAO]] 126662, [[Fifth Fundamental Catalogue|FK5]] 800, [[Boss General Catalogue|GC]] 29735 |
Revisi per 31 Oktober 2018 05.07
Data pengamatan Epos J2000.0 Ekuinoks J2000.0 | |
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Rasi bintang | Equuleus |
Asensio rekta | 21j 15m 49.43192d[1] |
Deklinasi | +5° 14′ 52.2430″[1] |
Magnitudo tampak (V) | +3,919[2] |
Ciri-ciri | |
Kelas spektrum | G7III + kA3hA4mA9[3] |
Indeks warna U−B | +0,284[2] |
Indeks warna B−V | +0,529[2] |
Astrometri | |
Kecepatan radial (Rv) | −15,71 ± 0,05[3] km/s |
Gerak diri (μ) | RA: +59,88 ± 0,23[1] mdb/thn Dek.: −94,09 ± 0,18[1] mdb/thn |
Paralaks (π) | 17,14±0,21[1] mdb |
Jarak | 190 ± 2 tc (58,3 ± 0,7 pc) |
Magnitudo mutlak (MV) | +0,17 (0,71 + 1,18)[3] |
Orbit[3] | |
Periode (P) | 98,8098 hari |
Eksentrisitas (e) | 0 |
Semiamplitudo (K1) (primer) | 16,34 ± 0,07 km/s |
Semiamplitudo (K2) (sekunder) | 17,9 ± 0,3 km/s |
Detail | |
A | |
Massa | 2,3[3] M☉ |
Radius | 9,2[3] R☉ |
Luminositas | 52,5[3] L☉ |
Suhu | 5.100[3] K |
Kecepatan rotasi (v sin i) | 20,0[4] km/s |
B | |
Massa | 2,0[3] M☉ |
Radius | 2,6[3] R☉ |
Luminositas | 26,3[3] L☉ |
Suhu | 8.150[3] K |
Usia | 740[3] megatahun |
Penamaan lain | |
Referensi basis data | |
SIMBAD | data |
Alpha Equulei (α Equ / α Equulei) adalah salah satu bintang di rasi Equuleus dan merupakan bintang tercerah di rasi ini. Alpha Equulei termasuk bintang dengan kelas G0III dan bermagnitudo +3.92, serta memiliki kecemerlangan 75 kali Matahari.
Alpha Equulei merupakan bintang ganda yang unik. Komponen yang berada pada bintang ini memiliki kelas G + A. Komponen yang lebih terang memiliki kecemerlangan 45 kali Matahari dan termasuk bintang raksasa kelas G (G0). Sedangkan komponen yang lebih redup adalah bintang katai tipe A kelas A5 (white class A, classA5 dwarf). Bintang raksasanya berada tahapan bintang mati. Suhunya diperkirakan 5500 sampai 8500 Kelvin. Bintang ini berada pada jarak 186 tahun cahaya dari Bumi.
Etimologi
Bintang ini sering disebut dengan nama tradisionalnya, yaitu Kitalpha (karang-karang Kitel Phard atau Kitalphar),yang berasal dari bahasa Arab قطعة الفرس qiṭ‘a(t) al-faras "bagian dari sang kuda". Nama lainnya untuk bintang ini adalah :
nama lain | asal bahasa | arti |
---|---|---|
虚宿二 / Xūsùèr | China | bintang kedua pada rasi Kehampaan[5] |
Heu | China | kehampaan[6] |
Referensi
- "HD 202447 -- Spectroscopic binary". SIMBAD Astronomical Database. Diakses tanggal 2007-01-22.
- Kaler: Kitalpha
- ^ a b c d e van Leeuwen, F. (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.Vizier catalog entry
- ^ a b c Cousins, A. W. J. (1984). "Standardization of Broadband Photometry of Equatorial Standards". South African Astronomical Observatory Circulars. 8: 59. Bibcode:1984SAAOC...8...59C.
- ^ a b c d e f g h i j k l m Griffin, R. E. M.; Griffin, R. F. (2002). "Composite spectra Paper 11: α Equulei, an astrometric binary with an Am secondary". Monthly Notices of the Royal Astronomical Society. 330 (2): 288. Bibcode:2002MNRAS.330..288G. doi:10.1046/j.1365-8711.2002.05030.x.
- ^ Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P
- ^ salah satu rasi bintang menurut bangsa Cina
- ^ http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Aquarius*.html