Tau Cygni

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Tau Cygni AB[1][2][3]
Diagram showing star positions and boundaries of the Cygnus constellation and its surroundings
Cercle rouge 100%.svg

Location of τ Cygni (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 21h 14m 47.4916s
Declination +38° 02′ 43.141″
Apparent magnitude (V) 3.80 / 6.69[4]
Characteristics
Spectral type F2 IV + G0 V
U−B color index +0.03 / +0.09
B−V color index +0.38 / +0.60
Astrometry
Radial velocity (Rv) -21.1 km/s
Proper motion (μ) RA: 195.75 mas/yr
Dec.: 410.03 mas/yr
Parallax (π) 47.80 ± 0.61 mas
Distance 68.2 ± 0.9 ly
(20.9 ± 0.3 pc)
Details
τ Cyg A
Mass 1.65[4] M☉
Radius 2.48[4] R☉
Surface gravity (log g) 3.87[4] cgs
Temperature 6,600[4] K
Metallicity [Fe/H] 0.05[4] dex
τ Cyg B
Mass 1.03[4] M☉
Radius 0.93[4] R☉
Surface gravity (log g) 4.52[4] cgs
Temperature 5,670[4] K
Other designations
Tau Cygni, 65 Cygni, BD+37°4240, HD 202444, HIP 104887, HR 8130, SAO 71121, GC 29723, CCDM J21148+3803AB.

Tau Cygni (τ Cyg) is a binary star system in the constellation Cygnus, approximately 69 light years away from Earth.[1] This visual binary system has a period of 49.6 years.[4]

The main star, 4th magnitude GJ 822.1 A, is a yellowish white subgiant star of the spectral type F2IV. It therefore has a surface temperature of 6,000 to 7,500 kelvins and is larger, hotter, and several times as bright as our Sun.[2] Its companion, 6th magnitude GJ 822.1 B, is a yellow main sequence star of the spectral type G0V. It is similar to our Sun in size, surface temperature, and luminosity.[3]

References

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  1. ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 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. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 Lua error in package.lua at line 80: module 'strict' not found.
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