Azelfafage

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Star
Azelfafage (π 1 Cygni)
π 1 Cyg in the constellation "Swan"
AladinLite
Observation
dates equinoxJ2000.0 , epoch : J2000.0
Constellation swan
Right ascension 21 h 42 m 5.67 s
declination + 51 ° 11 ′ 22.6 ″
Apparent brightness 4.64 likes
Typing
B − V color index −0.12 
U − B color index −0.69 
Spectral class B3 IV
Astrometry
Radial velocity (−8.20 ± 10) km / s
parallax (1.89 ± 0.15)  mas
distance (1725 ± 140)  ly
(530 ± 42)  pc
Proper movement 
Rec. Share: 5.29  mas / a
Dec. portion: −1.78  mas / a
Physical Properties
Other names
and catalog entries
Bayer name π 1 Cygni
Flamsteed name 80 Cygni
Bonn survey BD + 50 ° 3410
Bright Star Catalog HR 8301 [1]
Henry Draper Catalog HD 206672 [2]
Hipparcos catalog HIP 107136 [3]
SAO catalog SAO 33665 [4]
Tycho catalog TYC 3603-3215-1 [5]
2MASS catalog 2MASS J21420566 + 5111225 [6]

Azelfafage is the proper name of the star Pi 1 Cygni (π 1  Cyg) in the constellation Swan . Azelfafage has an apparent magnitude of +4.64 mag and belongs to the spectral class B3 IV. The distance is approximately 1,725 light years . It is a spectroscopic double star with a blue-white subgiant as the main component, which has about 3,300 times the luminosity of the sun .

The name goes back to an Arabic word that has not been passed down clearly, although depending on the source it has a meaning السلحفاة / as-sulaḥfāt  / 'the turtle',ظلف الفرس / ẓilf al-faras  / 'the horse's hoof' orأصل الدجاجة / aṣl ad-daǧāǧa  / 'origin of the hen' assumed.

Scientific investigations

One investigation found that dark cloud B 164 may be the same distance from us as the neighboring star π 1  Cygni, which may have recently started to compress this cloud on one side due to heating or increased radiation pressure.

location

Location of Azelfafage ( or Cygni 80) in the constellation Swan northeast of Deneb ( or Cygni 50) and the open star cluster Messier 39

Azelfafage ( or Cygni 80, 4.66 m ) is located in the constellation Swan on the border with the constellation Lizard . It is located northeast of the brightest star Deneb ( or Cygni 50, 1.25 m ), which marks the tail of the constellation Swan , and northeast of the equally bright open star cluster Messier 39 (4.66 m ). This star cluster is located approximately halfway between Azelfafage and the slightly darker star Cygni 71 ( , 5.22 m ). The slightly brighter star Cygni 81 ( 4.18 m ) can be seen a little south of Azelfafage .

Individual evidence

  1. a b c d e f VizieR: Hipparcos, the New Reduction (van Leeuwen, 2007) - The Astrometric Catalog
  2. L. Ideler: Investigations into the origin and the meaning of the star names. Berlin 1809, pp. 79-80, 307-308.
  3. L. Paganini, C. Bréart de Boisanger: The structure and evolution of the dark cloud B 164 under the influence of a bright star, π 1 Cyg. In: Astronomy & Astrophysics. Vol. 312, 1996, pp. 989-999, bibcode : 1996A & A ... 312..989P .