Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pegasus |
Right ascension | 22h 26m 37.37059s [1] |
Declination | +04° 23′ 37.6056″ [1] |
Apparent magnitude (V) | 5.76 [2] |
Characteristics | |
Spectral type | F7V [3] or F8IV−V [4] + K4 [5] |
B−V color index | 0.519±0.005 [2] |
Astrometry | |
Radial velocity (Rv) | −13.5±0.2 [2] km/s |
Proper motion (μ) |
RA: +307.781
[1]
mas/
yr Dec.: +47.533 [1] mas/ yr |
Parallax (π) | 24.9028 ± 0.1794 mas [1] |
Distance | 131.0 ± 0.9
ly (40.2 ± 0.3 pc) |
Absolute magnitude (MV) | 2.85 [4] |
Orbit [4] | |
Primary | Aa |
Companion | Ab |
Period (P) | 929.91±0.46 d |
Semi-major axis (a) | 9.5±0.3" (≥58.24±0.65 Gm) |
Eccentricity (e) | 0.4358±0.0062 |
Inclination (i) | 94.0±5.1° |
Longitude of the node (Ω) | 101.6±4.6° |
Periastron epoch (T) | 53,293.9±3.2 HJD |
Argument of periastron (ω) (secondary) | 188.5±1.1° |
Semi-amplitude (K1) (primary) | 5.060±0.054 km/s |
Details | |
Aa | |
Mass | 1.33 [6] M☉ |
Radius | 2.25+0.07 −0.08 [1] R☉ |
Luminosity | 6.7±0.1 [1] L☉ |
Surface gravity (log g) | 3.92 [6] cgs |
Temperature | 6,200+110 −100 [1] K |
Metallicity [Fe/H] | −0.04±0.02 [2] dex |
Rotational velocity (v sin i) | 8.4±1.0 [4] km/s |
Age | 3.22 [6] Gyr |
Ab | |
Mass | 0.29 [4] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
34 Pegasi is a triple star [7] system in the northern constellation of Pegasus. It has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.76. [2] The system is located at a distance of 131 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −13.5 km/s. [2] It has been catalogued as a member of the Hyades Supercluster, [9] although its membership status remains doubtful.
The innermost system is a single-lined spectroscopic binary with an orbital period of 2.55 years and an eccentricity of 0.44. [4] The orbital plane of this pair is being viewed nearly edge-on, and has an angular semimajor axis of 9.5 ″. [4] A third member of the system has a poorly-constrained 420 year orbit around the main pair. [10] This star was discovered by Burnham in 1874, [5] and the discovery code BU 290 was given to the double. As of 2015, it lies at an angular separation of 3.90±0.02 along a position angle of 226.2°±0.8° from the inner system. [7]
The primary member, component Aa, is an F-type main-sequence star that is starting to evolve off the main sequence, [4] with stellar classifications of F7V [3] or F8IV−V, [4] depending on the source. It is around three [6] billion years old and is spinning with a projected rotational velocity of 8 km/s, [4] with a measured rotation period of 12 days. [5] The star has 1.3 [6] times the mass of the Sun and 2.25 [1] times the Sun's radius. It is radiating 6.7 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,200 K. [1]
The secondary companion to the primary, component Ab, is most likely a red dwarf [5] star with around 29% of the mass of the Sun. [4] The tertiary member, component B, has 53% [11] of the Sun's mass and a class of around K4. [5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pegasus |
Right ascension | 22h 26m 37.37059s [1] |
Declination | +04° 23′ 37.6056″ [1] |
Apparent magnitude (V) | 5.76 [2] |
Characteristics | |
Spectral type | F7V [3] or F8IV−V [4] + K4 [5] |
B−V color index | 0.519±0.005 [2] |
Astrometry | |
Radial velocity (Rv) | −13.5±0.2 [2] km/s |
Proper motion (μ) |
RA: +307.781
[1]
mas/
yr Dec.: +47.533 [1] mas/ yr |
Parallax (π) | 24.9028 ± 0.1794 mas [1] |
Distance | 131.0 ± 0.9
ly (40.2 ± 0.3 pc) |
Absolute magnitude (MV) | 2.85 [4] |
Orbit [4] | |
Primary | Aa |
Companion | Ab |
Period (P) | 929.91±0.46 d |
Semi-major axis (a) | 9.5±0.3" (≥58.24±0.65 Gm) |
Eccentricity (e) | 0.4358±0.0062 |
Inclination (i) | 94.0±5.1° |
Longitude of the node (Ω) | 101.6±4.6° |
Periastron epoch (T) | 53,293.9±3.2 HJD |
Argument of periastron (ω) (secondary) | 188.5±1.1° |
Semi-amplitude (K1) (primary) | 5.060±0.054 km/s |
Details | |
Aa | |
Mass | 1.33 [6] M☉ |
Radius | 2.25+0.07 −0.08 [1] R☉ |
Luminosity | 6.7±0.1 [1] L☉ |
Surface gravity (log g) | 3.92 [6] cgs |
Temperature | 6,200+110 −100 [1] K |
Metallicity [Fe/H] | −0.04±0.02 [2] dex |
Rotational velocity (v sin i) | 8.4±1.0 [4] km/s |
Age | 3.22 [6] Gyr |
Ab | |
Mass | 0.29 [4] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
34 Pegasi is a triple star [7] system in the northern constellation of Pegasus. It has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.76. [2] The system is located at a distance of 131 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −13.5 km/s. [2] It has been catalogued as a member of the Hyades Supercluster, [9] although its membership status remains doubtful.
The innermost system is a single-lined spectroscopic binary with an orbital period of 2.55 years and an eccentricity of 0.44. [4] The orbital plane of this pair is being viewed nearly edge-on, and has an angular semimajor axis of 9.5 ″. [4] A third member of the system has a poorly-constrained 420 year orbit around the main pair. [10] This star was discovered by Burnham in 1874, [5] and the discovery code BU 290 was given to the double. As of 2015, it lies at an angular separation of 3.90±0.02 along a position angle of 226.2°±0.8° from the inner system. [7]
The primary member, component Aa, is an F-type main-sequence star that is starting to evolve off the main sequence, [4] with stellar classifications of F7V [3] or F8IV−V, [4] depending on the source. It is around three [6] billion years old and is spinning with a projected rotational velocity of 8 km/s, [4] with a measured rotation period of 12 days. [5] The star has 1.3 [6] times the mass of the Sun and 2.25 [1] times the Sun's radius. It is radiating 6.7 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,200 K. [1]
The secondary companion to the primary, component Ab, is most likely a red dwarf [5] star with around 29% of the mass of the Sun. [4] The tertiary member, component B, has 53% [11] of the Sun's mass and a class of around K4. [5]