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61 Cygni

61 Cygni
Observasjonsdata
Epoke J2000.0
61 Cygni A
Rektascensjon21t 06m 53.9434s[1]
Deklinasjon+38° 44′ 57.898″[1]
Tilsynelatende størrelsesklasse (V)5.21[1]
61 Cygni B
Rektascensjon21t 06m 55.2648s[2]
Deklinasjon+38° 44′ 31.400″[2]
Tilsynelatende størrelsesklasse (V)6.03[2]
Karakteristikk
SpektralklasseK5V[1] / K7V[2]
Fargeindeks U–B+1.155 / +1.242[3]
Fargeindeks B–V+1.139 / +1.320[3]
Astrometri
Radialhastighet (Rv)-64.3[1]/-63.5[2] km/s
Egenbevegelse (μ)RA: 4156.93[1]/
 4109.17[2] mas/år
DEK: 3259.39[1]/
 3144.17[2] mas/år
Parallakse (π)285.88 ± 0.54 mas[4]
Avstand11,41 ± 0,02 ly
(3,498 ± 0,007 pc)
Absolutt størrelsesklasse (MV)7.48/8.33
Detaljer
61 Cygni A
Masse0.70[5] M
Radius0.665 ± 0.005[6] R
Overflategravitasjon (log g)4.40[7]
Temperatur4 526 ± 66[8] K
Rotasjon35.37 d[9]
61 Cygni B
Masse0.63[5] M
Radius0.595 ± 0.008[6] R
Overflategravitasjon (log g)4.20[7]
Temperatur4 077 ± 59[8] K
Rotasjon37.84 d[9]
Bane[10]
Ledsager61 Cygni B
Periode (P)678 ± 34 år
Store halvakse (a)24.272 ± 0.592 "
Eksentrisitet (e)0.49 ± 0.03
Inklinasjon (i)51 ± 2 °
Lengden til oppstigende knute (Ω)178 ± 2 °
Perihel-epoke (T)1 709 ± 16 °
Perihelargument (ω)149 ± 6 °
Andre betegnelser
61 Cyg A/B

GJ 820 A/B, Struve 2758 A/B, ADS 14636 A/B, V1803 Cyg A/B, GCTP 5077.00 A/B [11]

61 Cyg A

V1803 Cyg, HD 201091, HIP 104214, HR 8085, BD+38°4343, LHS 62 [1]

61 Cyg B

HD 201092, HIP 104217, HR 8086, BD+38°4344,

LHS 63[2]

61-Cygni er en stjerne i stjernebildet Svanen. Stjernen befinner seg 11 lysår fra solen. 61-Cygni er den første fiksstjernen hvor avstanden ble bestemt. Det ble gjort ved parallaksemetoden av Friedrich Wilhelm Bessel i 1838.

61 Cygni kommer fra John Flamsteeds stjernekatalog fra 1700-tallet og betyr at det var den 61. stjerne i Svanen (Cygnus), målt fra vest. 61 Cygni har senere vist seg å være en dobbeltstjerne med HIPPARCOS-katalogbetegnelsene HIP 104214 (61 Cyg A) og HIP 104217 (61 Cyg B).

Referanser

[rediger | rediger kilde]
  1. ^ a b c d e f g h i «SIMBAD Query Result: V* V1803 Cyg -- Variable of BY Dra type». SIMBAD. Centre de Données astronomiques de Strasbourg. Besøkt 15. juli 2007.  (61 Cygni A)
  2. ^ a b c d e f g h i «SIMBAD Query Result: NSV 13546 -- Flare Star». SIMBAD. Centre de Données astronomiques de Strasbourg. Besøkt 15. juli 2007.  (61 Cygni B)
  3. ^ a b Blanco, C.; Marilli, E.; Catalano, S. (1979). «Photoelectric observations of stars with variable H and K emission components. III». Astronomy and Astrophysics Supplement Series. 36: 297–306. Bibcode:1979A&AS...36..297B. 
  4. ^ 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 
  5. ^ a b Staff (June 8, 2007), List of the Nearest 100 Stellar Systems, Research Consortium on Nearby Stars, Georgia State University, arkivert fra originalen on 1 July 2007, http://joy.chara.gsu.edu/RECONS/, besøkt 2007-07-15 
  6. ^ a b Kervella, P. m. fl.. (September 2008), «The radii of the nearby K5V and K7V stars 61 Cygni A & B. CHARA/FLUOR interferometry and CESAM2k modeling», Astronomy and Astrophysics 488 (2): 667–674, Bibcode 2008A&A...488..667K, DOI:10.1051/0004-6361:200810080 
  7. ^ a b Luck, R. Earle; Heiter, Ulrike (2005), «Stars within 15 Parsecs: Abundances for a Northern Sample», The Astronomical Journal 129 (2): 1063–1083, Bibcode 2005AJ....129.1063L, DOI:10.1086/427250 
  8. ^ a b van Belle, Gerard T.; von Braun, Kaspar (2009), «Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars», The Astrophysical Journal 694 (2): 1085–109, Bibcode 2009ApJ...694.1085V, DOI:10.1088/0004-637X/694/2/1085 
  9. ^ a b Böhm-Vitense, Erika (March 2007), «Chromospheric Activity in G and K Main-Sequence Stars, and What It Tells Us about Stellar Dynamos», The Astrophysical Journal 657 (1): 486–493, Bibcode 2007ApJ...657..486B, DOI:10.1086/510482 
  10. ^ Hartkopf, W. I.; Mason, Brian D. «Sixth Catalog of Orbits of Visual Binary Stars». U.S. Naval Observatory. Besøkt 12. juli 2008. 
  11. ^ «SIMBAD Query Result: ADS 14636 AB -- Double or multiple star». SIMBAD. Centre de Données astronomiques de Strasbourg. Besøkt 1. april 2009.  (61 Cygni)


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61 Cygni
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