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Chi1 Sagittarii
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 25m 16.49013s[1] |
| Declination | −24° 30′ 30.8599″[1] |
| Apparent magnitude (V) | +5.03[2] |
| Characteristics | |
| Spectral type | A3/5 IV/V[3] |
| B−V color index | +0.23[2] |
| Astrometry | |
| Radial velocity (Rv) | −43.4±1.6[4] km/s |
| Proper motion (μ) | RA: +61.63[1] mas/yr Dec.: −50.66[1] mas/yr |
| Parallax (π) | 12.95 ± 0.50 mas[1] |
| Distance | 252 ± 10 ly (77 ± 3 pc) |
| Absolute magnitude (MV) | +0.59[5] |
| Orbit[6] | |
| Period (P) | 5.72 yr |
| Semi-major axis (a) | 0.069″ |
| Eccentricity (e) | 0.710 |
| Inclination (i) | 97.3° |
| Longitude of the node (Ω) | 259.0° |
| Periastron epoch (T) | 1984.29 |
| Argument of periastron (ω) (secondary) | 10.7° |
| Details | |
| Chi1 Sgr A | |
| Mass | 1.64[7] M☉ |
| Luminosity | 42.9[8] L☉ |
| Surface gravity (log g) | 4.15[7] cgs |
| Temperature | 7,859±267[7] K |
| Rotational velocity (v sin i) | 54[9] km/s |
| Age | 393[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Chi1 Sagittarii (χ1 Sagittarii) is a binary star[6] system in the zodiac constellation of Sagittarius. The pair have a combined apparent visual magnitude of +5.03,[2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 12.95 mas as seen from Earth,[1] it is located around 252 light years from the Sun. It is advancing through space in the general direction of the Earth with a radial velocity of −43.4 km/s.[4]
This is a visual binary with an orbital period of 5.72 years, an eccentricity of 0.710, and an angular semimajor axis of 69 mas. The primary, component A, is an A-type star showing a mixed spectrum that matches a stellar classification of A3/5 IV/V.[3] Helmut Abt classified it as an Am star with a spectral type of kA5hF0VmF0.[11] This notation indicates it has the calcium K-lines of an A5 star, and the hydrogen and metal lines of an F0 star. It is around 393[7] million years old and is spinning with a projected rotational velocity of 54 km/s.[9] The star has an estimated 1.6[7] times the mass of the Sun and is radiating 42.9[8] times the Sun's luminosity from its photosphere at an effective temperature of 7,859 K.[7]
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