Xi Sagittarii
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| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 57m 20.5s |
| Declination | -20° 39' 23" |
| Apparent magnitude (V) | +5.02 |
| Distance | > 2300 ly (> 700 pc) |
| Spectral type | B9.5Ib |
| Other designations | |
The Bayer designation Xi Sagittarii (ξ Sgr, ξ Sagittarii) is shared by two stars, ξ¹ Sagittarii and ξ² Sagittarii, in the constellation Sagittarius, separated by 0.46° in the sky. Because they are close to the ecliptic, they can be occulted by the Moon and, very rarely, by planets. The last occultation of ξ² Sagittarii by a planet took place on 22 December 1810, when it was occulted by Venus.
[edit] ξ¹ Sagittarii
Xi-1 Sagittarii is a spectral type B9.5 supergiant which has an apparent magnitude of +5.08. It is at least 2300 light years from Earth.
[edit] ξ² Sagittarii
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 57m 43.8s |
| Declination | -21° 06' 24" |
| Apparent magnitude (V) | +3.52 |
| Distance | 372 ± 42 ly (114 ± 13 pc) |
| Spectral type | G8/K0II/III |
| Other designations | |
Xi-2 Sagittarii is a spectral type G8 or K0 giant which has an apparent magnitude of +3.52. It is 372 light years from Earth.
[edit] References
- "HD 175687 -- High proper-motion Star". SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=xi1+sagittarii&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2005&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000.0&Equi2=1950.0&Equi3=2000.0&Epoch1=2000.0&Epoch2=1950.0&Epoch3=2000.0. Retrieved 2007-03-29.
- "HD 175775 -- High proper-motion Star". SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=xi2+sagittarii&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2005&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000.0&Equi2=1950.0&Equi3=2000.0&Epoch1=2000.0&Epoch2=1950.0&Epoch3=2000.0. Retrieved 2007-03-29.
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