Prokyon

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Double star
Prokyon (α Canis Minoris)
Location of the star in the constellation Little Dog
Observation
dates equinox :  J2000.0 , epoch : J2000.0
AladinLite
Constellation Small dog
Right ascension 07 h 39 m 18.1 s
declination + 05 ° 13 ′ 30.0 ″
Apparent brightness  0.37 mag
Astrometry
Radial velocity (−3.2 ± 0.9) km / s
parallax (285.9 ± 0.9) mas
distance  (11.41 ± 0.04) Lj
((3.497 ± 0.011) pc )
Proper movement :
Rec. Share: approx. −717 mas / a
Dec. portion: approx. −1035 mas / a
Individual data
Names A; B.
Observation data:
Apparent brightness A. +0.37 mag
B. 10.92 mag
Typing:
Spectral class A. F5 IV-V
B. DQZ
B − V color index A. (+0.42)
B. (−0.22)
U − B color index A. (+0.03)
Physical Properties:
Absolute vis.
Brightness M vis 		A. +2.7 mag
B. +13 likes
Dimensions A. 1.5 M ☉
B. 0.6 M ☉
radius A. 2.05 R ☉
B. 0.012 R ☉
Luminosity A. 6.93 L ☉
B. 0.0005 L ☉
Effective temperature A. 6530 K
B. 7740 K
Rotation time A. 4.6 d
B. 0.5 d
Age 1.7 billion years
Other names
and catalog entries
Bayer name α Canis Minoris
Flamsteed name 10 Canis Minoris
Bonn survey BD + 5 ° 1739
Bright Star Catalog HR 2943 [1]
Henry Draper Catalog HD 61421 [2]
SAO catalog SAO 115756 [3]
Hipparcos catalog HIP 37279 [4]
Further designations: GJ 280 • LHS 233 • FK5  291

Prokyon [proˈkyɔn] (α Canis Minoris; synonyms: Elgomaisa, Algomeysa, Antecanis ; in ancient Egyptian Imi-chet-Sopdet ) is the brightest star in the constellation Little Dog . At a distance of 11.4  light years , it is one of the stars closest to the Sun. The Greek name means "before the dog" and indicates that it rises before Sirius , the dog star.

description

Prokyon is the brightest star in the constellation Canis Minor (bottom left).

Prokyon is part of the winter hexagon and winter triangle .

Like Sirius, Prokyon is a double star - the main star Prokyon A, a whitish-yellow star of the spectral class F5, has a faint companion 11th magnitude, Prokyon B, which is a white dwarf . The orbital period of the binary star system is 41 years.

Measurements by the MOST satellite could not detect any oscillations (fluctuations in brightness) at Prokyon. These should be measurable in so-called starquakes, which were expected at Prokyon (→ helioseismology ).

Others

Prokyon is depicted in the flag of Brazil , where it represents the state of Amazonas .

Position of Prokyon B versus Prokyon A.

Web links

Commons : Prokyon  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d e f alf CMi. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 18, 2018 .
  2. ↑ a b alf CMi B. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed September 18, 2018 .
  3. ^ Hipparcos catalog (1997)
  4. ^ Daniel J. Schroeder, David A. Golimowski, Ryan A. Brukardt, Christopher J. Burrows, John J. Caldwell, William G. Fastie, Holland C. Ford, Brigette Hesman, Ilona Kletskin, John E. Krist, Patricia Royle, Richard. A. Zubrowski: A Search for Faint Companions to Nearby Stars Using the Wide Field Planetary Camera 2 . In: The Astronomical Journal . 119, No. 2, February 2000, pp. 906-922. bibcode : 2000AJ .... 119..906S . doi : 10.1086 / 301227 .
  5. ↑ James Liebert, Gilles Fontaine, Patrick A. Young, Kurtis A. Williams, David Arnett: The Age and Stellar Parameters of the Procyon Binary System . In: The Astrophysical Journal . 769, No. 1, May 2013, p. 10. arxiv : 1305.0587 . 7. bibcode : 2013ApJ ... 769 .... 7L . doi : 10.1088 / 0004-637X / 769/1/7 .
  6. ↑ a b c J. L. Provencal, HL Shipman, Detlev Koester, F. Wesemael, P. Bergeron: Procyon B: Outside the Iron Box . In: The Astrophysical Journal . 568, No. 1, 2002, pp. 324-334. bibcode : 2002ApJ ... 568..324P . doi : 10.1086 / 338769 .
  7. ↑ a b c P. Kervella, F. Thévenin, P. Morel, G. Berthomieu, P. Bordé, J. Provost: The diameter and evolutionary state of Procyon A. Multi-technique modeling using asteroseismic and interferometric constraints . In: Astronomy and Astrophysics . 413, No. 1, January 2004, pp. 251-256. arxiv : astro-ph / 0309148 . bibcode : 2004A & A ... 413..251K . doi : 10.1051 / 0004-6361: 20031527 .
  8. ↑ N. Giammichele, P. Bergeron, P. Dufour: Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs . In: The Astrophysical Journal Supplement . 199, No. 2, April 2012, p. 29. arxiv : 1202.5581 . bibcode : 2012ApJS..199 ... 29G . doi : 10.1088 / 0067-0049 / 199/2/29 . Age is for the white dwarf stage.