Xi Sagittarii
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
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. The two stars are separated by 0.46° on the sky. The star ξ² Sagittarii in particular carries the proper name Nergal, which is the name of an Assyrian or Babylonian deity that was portrayed within parts of Sagittarius.
Because they are close to the ecliptic, these stars 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 |
|
|---|---|
| Constellation (pronunciation) |
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. Retrieved on 2007-03-29.
- HD 175775 -- High proper-motion Star. SIMBAD Astronomical Database. Retrieved on 2007-03-29.
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