Lambda Cygni

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Lambda Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 20h 47m 24.53766s [1]
Declination 36° 29′ 26.5737″ [1]
Apparent magnitude (V) 4.54 [2]
Characteristics
Spectral type B5V [3]
U−B color index -0.50 [2]
B−V color index -0.11 [2]
Astrometry
Radial velocity (Rv) -23.20[4] km/s
Proper motion (μ) RA: +14.71[5] mas/yr
Dec.: -8.96[5] mas/yr
Parallax (π) 4.24 ± 0.43[1] mas
Distance approx. 770 ly
(approx. 240 pc)
Absolute magnitude (MV) -2.32 [6]
Details
Radius 3.56 [7] R
Other designations
54 Cygni, CCDM J20475+3629ABP, GC 28994, HIP 102589, HR 7963, HD 198183, SAO 70505, WDS J20474+3629AB [5]
Database references
SIMBAD data

Lambda Cygni (λ Cyg) is a class B5V[3] (blue main-sequence) star in the constellation Cygnus. Its apparent magnitude is 4.54[2] and it is approximately 770 light years away based on parallax.[1]

Lambda Cygni is a multiple star, with components A, B, and C observed in the 19th century; the main component, A, is a spectroscopic binary itself with two components Aa and Ab reported at magnitudes 5.4 and 5.8 orbiting with a period of 12 years.[8] Component B has type B7V, magnitude 6.26, and separation 0.77" (about 180 AU based on parallax).[9][8] Component C has reported type K2III-IV, apparent magnitude 9.65, and separation about 85".[10] Recent observations indicate the presence of additional smaller companions D (about 50" from A), E (about 8" from C), and F (about 40" from C) all around apparent magnitude 14.[10]

References

  1. 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
  2. 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
  3. 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
  4. Lua error in package.lua at line 80: module 'strict' not found.
  5. 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
  6. Absolute magnitude calculated as  M = m + 5 (1 + \log_{10}{p})\!\,, where M is the star's absolute magnitude, m is the star's apparent magnitude, and p is the star's measured parallax in arcseconds.
  7. Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
  8. 8.0 8.1 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
  9. Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
  10. 10.0 10.1 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry

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