Alpha Cephei

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Alpha Cephei
Emoji u2b55.svg
Die ligging van α Cephei in Cepheus.
Sterrebeeld Cepheus
Bayer-naam α Cep (afkorting)
Spektraaltipe A8Vn[1]
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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Alpha Cephei of α Cephei (afgekort as Alpha Cep of α Cep), ook bekend as Alderamin,[8] is ’n helder ster in die sterrebeeld Cepheus naby die noordelike hemelpool. Dit is redelik naby aan die Son, sowat 49  ligjare.

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.

Verwysings[wysig | wysig bron]

  1. (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. doi:10.1086/378365.
  2. 2,0 2,1 "SIMBAD query result: ALDERAMIN – Variable Star". Centre de Données astronomiques de Strasbourg. Verkry op 2010-12-20. 
  3. van Leeuwen, F (November 2007). “Hipparcos, the New Reduction”. Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Besoek op 2010-12-19.
  4. 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, Bibcode2000A&A...361..614P 
  5. 5,0 5,1 Mermilliod, J.-C. (1986). “Compilation of Eggen's UBV data, transformed to UBV (unpublished)”. Catalogue of Eggen's UBV data.
  6. 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, Bibcode1990A&AS...85.1015M 
  7. (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.
  8. "IAU Catalog of Star Names". Verkry op 28 Julie 2016. 

Eksterne skakels[wysig | wysig bron]

Koördinate: Sky map 21h 18m 34.7715s, +62° 35′ 08.061 ″