Alderamin
Alderamin (ook bekend as Alpha Cephei of α Cep) is ’n helder ster in die sterrebeeld Kefeus (Cepheus) naby die noordelike hemelpool. Dit is redelik naby aan die Son, sowat 49 ligjare.
Alderamin
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| Alderamin se ligging (in die rooi sirkel). | ||||
| Sterrebeeld | Kefeus | |||
| Bayer-naam | Alpha Cephei | |||
| Spektraaltipe | A8Vn[1] | |||
| Soort | Hoofreeksster | |||
| Waarnemingsdata (Epog J2000) | ||||
| Regte klimming | 21h 18m 34.7715s[2] | |||
| Deklinasie | +62° 35′ 08.061″[2] | |||
| Skynmagnitude (m) | 2,5141[3] | |||
| Absolute magnitude (M) | 1,57[4] | |||
| B-V-kleurindeks | +0,21[5] | |||
| U-B-kleurindeks | +0,12[5] | |||
| Besonderhede | ||||
| Massa (M☉) | 1,74[4] | |||
| Radius (R☉) | 2,3[6] | |||
| Ligsterkte (L☉) | 17[6] | |||
| Temperatuur (K) | 7 740 ± 170[6] | |||
| Eienskappe | ||||
| Veranderlikheid | δ Sct[7] | |||
| Ander name | ||||
| Alderamin, 5 Cep, 2MASS J21183475+6235081, AG+62° 1226, BD +61°2111, CCDM J21186+6236A, FK5 803, GCTP 5139.00, Gl 826, HD 203280, HIP 105199, HR 8162, SAO 19302 | ||||
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Met ’n deklinasie van meer as 62 grade noord is Alderamin meestal in die Noordelike Halfrond sigbaar, en reg deur die jaar in Europa, Noord-Asië, Kanada en Amerikaanse stede so ver suid as San Diego. Vanweë sy skynbare magnitude van sowat 2,5 is dit maklik met die blote oog sigbaar, selfs in stede met ligte lugbesoedeling.
Name
wysigDie ster se Bayer-naam is "Alpha Cephei" en sy Flamsteed-naam "5 Cephei". Die tradisionele naam, "Alderamin", kom van die Arabiese frase الذراع اليمين al-dhirā‘ al-yamīn, "die regterarm".
In 2016 het die Internasionale Astronomiese Unie se sternaamwerkgroep (WGSN) die naam "Alderamin" vir die ster goedgekeur.[8]
Verwysings
wysig- ↑ Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". The Astronomical Journal. 126 (4): 2048. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365.
- ↑ 2,0 2,1 "SIMBAD query result: ALDERAMIN – Variable Star". Centre de Données astronomiques de Strasbourg. Besoek op 20 Desember 2010.
- ↑ van Leeuwen, F (November 2007). "Hipparcos, the New Reduction". Astronomy and Astrophysics. Centre de Données astronomiques de Strasbourg. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Besoek op 19 Desember 2010.
- ↑ 4,0 4,1 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
- ↑ 5,0 5,1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. Bibcode:1986EgUBV........0M.
- ↑ 6,0 6,1 6,2 Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series 85 (3): 1015–1019, Bibcode: 1990A&AS...85.1015M
- ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ↑ "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF). Besoek op 28 Julie 2016.
Eksterne skakels
wysig- Alderamin op WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Artikels en foto's
Hierdie artikel is vertaal uit die Engelse Wikipedia
