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Binary star system in the constellation Aquila From Wikipedia, the free encyclopedia
14 Sagittae is a binary star[7] system in the equatorial constellation of Aquila.[10] 14 Sagittae is the Flamsteed designation. It appears as a sixth magnitude star, near the lower limit of visibility to the naked eye, having an apparent visual magnitude of 5.89.[2] The system is located 660 light years away, as determined from its annual parallax shift of 4.91 mas.[1] It is moving closer to the Earth with a heliocentric radial velocity of –22 km/s.[4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquila |
Right ascension | 20h 03m 30.01519s[1] |
Declination | +16° 01′ 52.5065″[1] |
Apparent magnitude (V) | 5.89[2] |
Characteristics | |
Spectral type | B9p HgMn[3] |
U−B color index | –0.44[2] |
B−V color index | –0.06[2] |
Astrometry | |
Radial velocity (Rv) | –21.7[4] km/s |
Proper motion (μ) | RA: +5.28[5] mas/yr Dec.: –8.99[5] mas/yr |
Parallax (π) | 4.9142 ± 0.0849 mas[1] |
Distance | 660 ± 10 ly (203 ± 4 pc) |
Absolute magnitude (MV) | −0.72[6] |
Orbit[7] | |
Period (P) | 61.541 d |
Eccentricity (e) | 0.49 |
Periastron epoch (T) | 2440799.01 JD |
Argument of periastron (ω) (secondary) | 345° |
Semi-amplitude (K1) (primary) | 4.2 km/s |
Details | |
14 Sge A | |
Luminosity | 291.53[6] L☉ |
Surface gravity (log g) | 3.60[3] cgs |
Temperature | 13,200[3] K |
Rotational velocity (v sin i) | 7.0±0.5[8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
This is a single-lined spectroscopic binary with an orbital period of 61.5 days and an eccentricity of 0.49.[7] The visible component is a chemically peculiar mercury-manganese star[11] with a stellar classification of B9p HgMn.[3] It is narrow-lined with a projected rotational velocity of 7 km/s.[8] The star is radiating 292[6] times the Sun's luminosity from its photosphere at an effective temperature of 13,200 K.[3]
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