| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 09m 45.8s |
| Declination | -21° 01' 25" |
| Apparent magnitude (V) | +2.88 |
| Distance | 440 ± 41 ly (135 ± 13 pc) |
| Spectral type | F2II/III |
| Other designations | |
Pi Sagittarii (π Sgr, π Sagittarii) is a triple star system in the constellation Sagittarius. It has the traditional name Albaldah.[1] It is known as 建三 (the Third Star of the Establishment) in Chinese.
In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Nir al Beldat, which was translated into Latin as Lucida Oppidi, meaning the brightest of the town.[2]
The star is 440 light years from Earth.
Albaldah has an apparent magnitude of +2.88 and belongs to the spectral class F2II. Albaldah has two companions in close orbits. Pi Sagittarii B is located 0.1 arcseconds from Albaldah, or at least 13 Astronomical Units (AU). The second companion, the 6th magnitude Pi Sagittarii C, is 0.4 arcseconds away, or at least 40 AU.
Because it is close to the ecliptic, Albaldah can sometimes be occulted by the Moon, and, very rarely, planets of our solar system. The next occultation by a planet takes place on February 17, 2035, when it will be occulted by Venus.
The name Albalda comes from the Arabic بلدة bálda 'the town'.
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