Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Cygnus |
Right ascension | 19h 55m 37.78622s[1] |
Declination | +52° 26′ 20.2116″[1] |
Apparent magnitude (V) | 4.92[2] (5.05 + 7.61)[3] |
Characteristics | |
A | |
Spectral type | A4 Vn[4] |
U−B color index | +0.05[2] |
B−V color index | +0.13[2] |
B | |
Spectral type | F4 V[5] |
Astrometry | |
Radial velocity (Rv) | −10[6] km/s |
Proper motion (μ) | RA: −37.62[1] mas/yr Dec.: −31.13[1] mas/yr |
Parallax (π) | 11.59 ± 0.38 mas[1] |
Distance | 281 ± 9 ly (86 ± 3 pc) |
Absolute magnitude (MV) | +0.23[7] |
Orbit[8] | |
Primary | Aa |
Companion | Ab |
Period (P) | 54.08 yr |
Semi-major axis (a) | 0.141″ |
Eccentricity (e) | 0.484 |
Inclination (i) | 112.0° |
Details | |
ψ Cyg Aa | |
Luminosity | 62[9] L☉ |
Temperature | 7,971[9] K |
Rotational velocity (v sin i) | 207[4] km/s |
ψ Cyg B | |
Rotational velocity (v sin i) | 120[10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
ψ Cygni, Latinised as Psi Cygni, is a triple star[3] system in the constellation called Cygnus. With a combined apparent visual magnitude of 4.92,[2] it is visible to the naked eye. As of 2002, the inner pair, components Aa and Ab, had an angular separation of 0.10 arc seconds along a position angle of 77.6°.[12] Their combined visual magnitude is 5.05.[3] Relative to this pair, the third member of the system, magnitude 7.61[3] component B, had an angular separation of 2.87 arc seconds along a position angle of 175.6° as of 2010.[13] Based upon an annual parallax shift of 11.59 mas,[1] Psi Cygni is located around 281 light years from the Sun.
The brighter member of the system, presumably component Aa, displays the spectrum of an A-type main sequence star with a stellar classification of A4 Vn,[4] where the 'n' notation indicates "nebulous" absorption lines due to rapid rotation. It appears to be a spinning with a projected rotational velocity of 207.[4] The component is radiating 62 times the solar luminosity from its outer atmosphere at an effective temperature of 7,971 K.[9]
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