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Zeta Sagittarii
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 02m 36.73024s[1] |
| Declination | –29° 52′ 48.2279″[1] |
| Apparent magnitude (V) | +2.59[2] (3.27/3.48)[3] |
| Characteristics | |
| Spectral type | A2.5 Va[4] |
| U−B color index | +0.05[2] |
| B−V color index | +0.08[2] |
| Astrometry | |
| Radial velocity (Rv) | +22[5] km/s |
| Proper motion (μ) | RA: +10.79[1] mas/yr Dec.: +21.11[1] mas/yr |
| Parallax (π) | 36.98 ± 0.87 mas[1] |
| Distance | 88 ± 2 ly (27.0 ± 0.6 pc) |
| Absolute magnitude (MV) | 1.11/1.32[3] |
| Orbit[6] | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 1 month |
| Semi-major axis (a) | 0.3 au |
| Orbit[3] | |
| Primary | A |
| Companion | B |
| Period (P) | 21.00 ± 0.01 years |
| Semi-major axis (a) | 0.489 ± 0.001"[3] (13.2 au)[6] |
| Eccentricity (e) | 0.211 ± 0.001 |
| Inclination (i) | 111.1 ± 0.1° |
| Longitude of the node (Ω) | 74.0 ± 0.1° |
| Periastron epoch (T) | 2005.99 ± 0.03 |
| Argument of periastron (ω) (secondary) | 7.2 ± 0.6° |
| Details[6] | |
| Aa | |
| Mass | 1.83 M☉ |
| Radius | 1.9 R☉ |
| Luminosity | 14.9[a] L☉ |
| Surface gravity (log g) | 3.90[7] cgs |
| Temperature | 8,230 K |
| Rotational velocity (v sin i) | 77[8] km/s |
| Age | 700 Myr |
| Ab | |
| Mass | 1.81 M☉ |
| Radius | 1.9 R☉ |
| Luminosity | 14.7[a] L☉ |
| Temperature | 8,200 K |
| Age | 700 Myr |
| B | |
| Mass | 2.03 M☉ |
| Radius | 2.3 R☉ |
| Luminosity | 24[a] L☉ |
| Temperature | 8,460 K |
| Age | 700 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta Sagittarii (ζ Sagittarii, abbreviated Zeta Sgr, ζ Sgr) is a triple star system and the third-brightest star in the constellation of Sagittarius after Kaus Australis and Nunki. Based upon parallax measurements, it is about 88 light-years (27 parsecs) from the Sun.[1]
The three components are designated Zeta Sagittarii Aa (officially named Ascella /əˈsɛlə/, the traditional name for the entire system),[9][10] Ab and B.[6] The Washington Double Star Catalog cites a component separated 72.3" from the system, but it is a background star unrelated to the pair.[6]
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