Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 20h 14m 32.03235s [2] |
Declination | +36° 48′ 22.7009″ [2] |
Apparent magnitude (V) | 4.94 - 4.97 [3] |
Characteristics | |
Evolutionary stage | main sequence [4] [5] |
Spectral type | A2 V [6] |
B−V color index | 0.151±0.018 [7] |
Variable type | δ Sct [8] |
Astrometry | |
Radial velocity (Rv) | −17.30±2.80 [7] km/s |
Proper motion (μ) |
RA: +68.391
[2]
mas/
yr Dec.: +70.446 [2] mas/ yr |
Parallax (π) | 24.5456 ± 0.0724 mas [2] |
Distance | 132.9 ± 0.4
ly (40.7 ± 0.1 pc) |
Absolute magnitude (MV) | 1.78 [7] |
Details | |
Mass | 2.14±0.15 [4] M☉ |
Radius | 2.16 [4] [a] R☉ |
Luminosity | 25.2+3.7 −3.1 [4] L☉ |
Surface gravity (log g) | 4.12±0.2565 [5] cgs |
Temperature | 8,790+1,513 −1,292 [4] K |
Rotational velocity (v sin i) | 65 [4] km/s |
Age | 40 [9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
29 Cygni is a single [9] star in the northern constellation of Cygnus. It is dimly visible to the naked eye as a white-hued star with an apparent visual magnitude of 4.93. [7] The distance to 29 Cyg, as estimated from an annual parallax shift of 24.5 mas, is 133 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −17 km/s. [7] It is a member of the 30–50 million year old Argus Association of co-moving stars. [11]
This is an A-type main-sequence star with a stellar classification of A2 V. [6] Rodríguez et al. (2000) classify it as a Delta Scuti variable with a frequency of 0.0267 cycles per day. [8] It is a Lambda Boötis [12] class chemically peculiar star and the first such star to be classified as a pulsating variable. [5] 29 Cyg is multi-periodic, [13] small-amplitude variable with a magnitude change of about 0.02 and a dominant period of 39 minutes. [5] A magnetic field has been detected with an averaged quadratic field of (194.5±230.7)×10−4 T. [14] The star has a moderate rate of rotation, [5] showing a projected rotational velocity of 65 km/s. [4] It has double [4] the mass of the Sun and is radiating 25 [4] times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,790 K. [4]
29 Cygni is listed in multiple star catalogs as having several companions within 4 ′, including the yellow 7th magnitude HD 192661. All are background objects not physically associated with 29 Cygni itself. [15] [16] The naked-eye stars b1 Cygni and b2 Cygni, respectively about one and two degrees away, also lie at different distances to 29 Cygni.
In 2022, a superjovian extrasolar planet HIP 99770 b was discovered by direct imaging and astrometry. Its spectral class is between L7 and L9.5, corresponding to a surface temperature of 1400±100 K. [17]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( years) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 13.9+6.1 −5.1 MJ |
16.9+3.4 −1.9 |
11900+3800 −1200 |
0.25+0.14 −0.16 |
148+13 −11 ° |
1 RJ |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 20h 14m 32.03235s [2] |
Declination | +36° 48′ 22.7009″ [2] |
Apparent magnitude (V) | 4.94 - 4.97 [3] |
Characteristics | |
Evolutionary stage | main sequence [4] [5] |
Spectral type | A2 V [6] |
B−V color index | 0.151±0.018 [7] |
Variable type | δ Sct [8] |
Astrometry | |
Radial velocity (Rv) | −17.30±2.80 [7] km/s |
Proper motion (μ) |
RA: +68.391
[2]
mas/
yr Dec.: +70.446 [2] mas/ yr |
Parallax (π) | 24.5456 ± 0.0724 mas [2] |
Distance | 132.9 ± 0.4
ly (40.7 ± 0.1 pc) |
Absolute magnitude (MV) | 1.78 [7] |
Details | |
Mass | 2.14±0.15 [4] M☉ |
Radius | 2.16 [4] [a] R☉ |
Luminosity | 25.2+3.7 −3.1 [4] L☉ |
Surface gravity (log g) | 4.12±0.2565 [5] cgs |
Temperature | 8,790+1,513 −1,292 [4] K |
Rotational velocity (v sin i) | 65 [4] km/s |
Age | 40 [9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
29 Cygni is a single [9] star in the northern constellation of Cygnus. It is dimly visible to the naked eye as a white-hued star with an apparent visual magnitude of 4.93. [7] The distance to 29 Cyg, as estimated from an annual parallax shift of 24.5 mas, is 133 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −17 km/s. [7] It is a member of the 30–50 million year old Argus Association of co-moving stars. [11]
This is an A-type main-sequence star with a stellar classification of A2 V. [6] Rodríguez et al. (2000) classify it as a Delta Scuti variable with a frequency of 0.0267 cycles per day. [8] It is a Lambda Boötis [12] class chemically peculiar star and the first such star to be classified as a pulsating variable. [5] 29 Cyg is multi-periodic, [13] small-amplitude variable with a magnitude change of about 0.02 and a dominant period of 39 minutes. [5] A magnetic field has been detected with an averaged quadratic field of (194.5±230.7)×10−4 T. [14] The star has a moderate rate of rotation, [5] showing a projected rotational velocity of 65 km/s. [4] It has double [4] the mass of the Sun and is radiating 25 [4] times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,790 K. [4]
29 Cygni is listed in multiple star catalogs as having several companions within 4 ′, including the yellow 7th magnitude HD 192661. All are background objects not physically associated with 29 Cygni itself. [15] [16] The naked-eye stars b1 Cygni and b2 Cygni, respectively about one and two degrees away, also lie at different distances to 29 Cygni.
In 2022, a superjovian extrasolar planet HIP 99770 b was discovered by direct imaging and astrometry. Its spectral class is between L7 and L9.5, corresponding to a surface temperature of 1400±100 K. [17]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( years) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 13.9+6.1 −5.1 MJ |
16.9+3.4 −1.9 |
11900+3800 −1200 |
0.25+0.14 −0.16 |
148+13 −11 ° |
1 RJ |