Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vulpecula |
Right ascension | 20h 15m 46.1432s [1] |
Declination | 27° 48′ 51.116″ [1] |
Apparent magnitude (V) | 4.52 [2] |
Characteristics | |
Spectral type | K3- III Fe-1 [3] |
U−B color index | +1.11 [2] |
B−V color index | +1.26 [2] |
Astrometry | |
Radial velocity (Rv) | +1.47 [4] km/s |
Proper motion (μ) |
RA: −39.938±0.128
[1]
mas/
yr Dec.: 12.121±0.147 [1] mas/ yr |
Parallax (π) | 9.9642 ± 0.1698 mas [1] |
Distance | 327 ± 6
ly (100 ± 2 pc) |
Absolute magnitude (MV) | −0.58 [5] |
Orbit [6] | |
Primary | 23 Vul Aa |
Companion | 23 Vul Ab |
Period (P) | 25.33 yr |
Semi-major axis (a) | 0.111″ |
Eccentricity (e) | 0.400 |
Inclination (i) | 71.5° |
Longitude of the node (Ω) | 97.5° |
Periastron epoch (T) | 2009.56 |
Argument of periastron (ω) (secondary) | 293.8° |
Details | |
23 Vul A | |
Mass | 2.4 [7] M☉ |
Radius | 31±2 [8] R☉ |
Luminosity | 288 [8] L☉ |
Surface gravity (log g) | 0.89 [9] cgs |
Temperature | 4,413±125 [8] K |
Metallicity [Fe/H] | −0.22 [8] dex |
Rotational velocity (v sin i) | 3.7 [10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
23 Vulpeculae is a triple star system [12] in the northern constellation of Vulpecula. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.52 [2] and it is located approximately 327 light years away from the Sun based on parallax. [1] The system is moving further from the Earth with a heliocentric radial velocity of +1.47 km/s. [4]
Component A forms a binary system with an orbital period of 25.33 years, an eccentricity of 0.40, and a semimajor axis of 0.11 ″. [6] The 4.80 magnitude member of this pair, component Aa is an aging giant star with a stellar classification of K3- III Fe-1, [3] where the suffix indicates an underabundance of iron in the spectrum. This star has 2.4 [7] times the mass of the Sun and is radiating 288 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,413 K. [8] Its companion, component Ab, has magnitude 6.5. [6] The tertiary member, component B, has a separation of 0.26" and a magnitude of 6.94. [7] [13] [12]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vulpecula |
Right ascension | 20h 15m 46.1432s [1] |
Declination | 27° 48′ 51.116″ [1] |
Apparent magnitude (V) | 4.52 [2] |
Characteristics | |
Spectral type | K3- III Fe-1 [3] |
U−B color index | +1.11 [2] |
B−V color index | +1.26 [2] |
Astrometry | |
Radial velocity (Rv) | +1.47 [4] km/s |
Proper motion (μ) |
RA: −39.938±0.128
[1]
mas/
yr Dec.: 12.121±0.147 [1] mas/ yr |
Parallax (π) | 9.9642 ± 0.1698 mas [1] |
Distance | 327 ± 6
ly (100 ± 2 pc) |
Absolute magnitude (MV) | −0.58 [5] |
Orbit [6] | |
Primary | 23 Vul Aa |
Companion | 23 Vul Ab |
Period (P) | 25.33 yr |
Semi-major axis (a) | 0.111″ |
Eccentricity (e) | 0.400 |
Inclination (i) | 71.5° |
Longitude of the node (Ω) | 97.5° |
Periastron epoch (T) | 2009.56 |
Argument of periastron (ω) (secondary) | 293.8° |
Details | |
23 Vul A | |
Mass | 2.4 [7] M☉ |
Radius | 31±2 [8] R☉ |
Luminosity | 288 [8] L☉ |
Surface gravity (log g) | 0.89 [9] cgs |
Temperature | 4,413±125 [8] K |
Metallicity [Fe/H] | −0.22 [8] dex |
Rotational velocity (v sin i) | 3.7 [10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
23 Vulpeculae is a triple star system [12] in the northern constellation of Vulpecula. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.52 [2] and it is located approximately 327 light years away from the Sun based on parallax. [1] The system is moving further from the Earth with a heliocentric radial velocity of +1.47 km/s. [4]
Component A forms a binary system with an orbital period of 25.33 years, an eccentricity of 0.40, and a semimajor axis of 0.11 ″. [6] The 4.80 magnitude member of this pair, component Aa is an aging giant star with a stellar classification of K3- III Fe-1, [3] where the suffix indicates an underabundance of iron in the spectrum. This star has 2.4 [7] times the mass of the Sun and is radiating 288 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,413 K. [8] Its companion, component Ab, has magnitude 6.5. [6] The tertiary member, component B, has a separation of 0.26" and a magnitude of 6.94. [7] [13] [12]