Psi Pegasi
Binary star system in the constellation Pegasus / From Wikipedia, the free encyclopedia
Psi Pegasi, which is Latinized from ψ Pegasi, is a binary star system within the great square[11] in the northern constellation of Pegasus. It has a red hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.66.[2] This object is located at a distance of approximately 476 light-years away from the Sun based on parallax,[1] but is drifting closer with a radial velocity of −6.6 km/s.[5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pegasus |
Right ascension | 23h 57m 45.52681s[1] |
Declination | 25° 08′ 29.0480″[1] |
Apparent magnitude (V) | 4.66[2] |
Characteristics | |
Spectral type | M3III[3] |
U−B color index | +1.66[2] |
B−V color index | +1.59[2] |
Variable type | suspected[4] |
Astrometry | |
Radial velocity (Rv) | −6.59±0.23[5] km/s |
Proper motion (μ) | RA: −35.24[1] mas/yr Dec.: −31.60[1] mas/yr |
Parallax (π) | 6.85 ± 0.24 mas[1] |
Distance | 480 ± 20 ly (146 ± 5 pc) |
Absolute magnitude (MV) | –1.19[6] |
Orbit[7] | |
Period (P) | 55.06±11.31 yr |
Semi-major axis (a) | 0.170±0.016″ |
Eccentricity (e) | 0.19±0.10 |
Inclination (i) | 65.6±2.2° |
Longitude of the node (Ω) | 46.6±2.3° |
Periastron epoch (T) | 2,001.83±8.81 |
Argument of periastron (ω) (secondary) | 159.7±11.9° |
Details | |
Radius | 98±6[8] R☉ |
Luminosity | 960[6] L☉ |
Temperature | 3,882[9] K |
Other designations | |
Database references | |
SIMBAD | data |
The orbital elements for this system were computed for the first time in 2004 based on interferometric observations, yielding an orbital period of roughly 55 years and an eccentricity of about 0.19.[7][13][14] The visible component is an aging red giant star on the asymptotic giant branch[15] with a stellar classification of M3III.[3] It is a suspected variable, probably semiregular, with its magnitude varying from 4.63 to 4.69[4][16] over periods of 37.4 and 118.9 days.[12] With the supply of hydrogen exhausted at its core, the star has cooled and expanded to around 98[8] times the Sun's radius. It is radiating 960[6] times the luminosity of the Sun from its bloated photosphere at an effective temperature of 3,882 K.[9]