14 Sagittae
Binary star system in the constellation Aquila
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14 Sagittae is a binary star[6] system in the equatorial constellation of Aquila.[9] 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.[3] The system is located 658 light years away, as determined from its annual parallax shift of 4.95 mas.[2] It is moving closer to the Earth with a heliocentric radial velocity of –22 km/s.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | 20h 03m 30.01476s[2] |
| Declination | +16° 01′ 52.5083″[2] |
| Apparent magnitude (V) | 5.89[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | B9p HgMn[4] |
| U−B color index | −0.44[3] |
| B−V color index | −0.06[3] |
| Astrometry | |
| Radial velocity (Rv) | −21.7[5] km/s |
| Proper motion (μ) | RA: +5.420[2] mas/yr Dec.: −8.189[2] mas/yr |
| Parallax (π) | 4.9546±0.0550 mas[2] |
| Distance | 658 ± 7 ly (202 ± 2 pc) |
| Absolute magnitude (MV) | −0.72[1] |
| Orbit[6] | |
| 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[1] L☉ |
| Surface gravity (log g) | 3.60[4] cgs |
| Temperature | 13,200[4] K |
| Rotational velocity (v sin i) | 7.0±0.5[7] km/s |
| Other designations | |
| 14 Sge, BD+15°4033, GC 27812, HD 190229, HIP 98754, HR 7664, SAO 105615[8] | |
| 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.[6] The visible component is a chemically peculiar mercury-manganese star[10] with a stellar classification of B9p HgMn.[4] It is narrow-lined with a projected rotational velocity of 7 km/s.[7] The star is radiating 292[1] times the Sun's luminosity from its photosphere at an effective temperature of 13,200 K.[4]
John Flamsteed labelled this star as y Sagittae, but the designation was dropped by later authors and is now largely unknown.[11]