| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 20h15m 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 | |
23 Vul, BD+27°3666, GC 28152, HD 192806, HIP 99874, HR 7744, SAO 88428, WDS J20158+2749AB[11] | |
| Database references | |
| SIMBAD | data |
23 Vulpeculae is a triple star system[12] in the northern constellationofVulpecula. 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 axisof0.11″.[6] The 4.80 magnitude member of this pair, component Aa is an aging giant star with a stellar classificationofK3- 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]
|
| |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||||
| Stars |
| ||||||||||||
| |||||||||||||
| |||||||||||||
| |||||||||||||
| Galaxies |
| ||||||||||||
| |||||||||||||
