| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 37m 45.1093s |
| Declination | -07° 51′ 15.125″ |
| Apparent magnitude (V) | 4.69 |
| Characteristics | |
| Spectral type | A7V |
| U−B color index | 0.13 |
| B−V color index | 0.17 |
| Astrometry | |
| Radial velocity (Rv) | -18 km/s |
| Proper motion (μ) | RA: 114.29 mas/yr Dec.: -24.44 mas/yr |
| Parallax (π) | 18.26 ± 0.84 mas |
| Distance | 179 ± 8 ly (55 ± 3 pc) |
| Absolute magnitude (MV) | 4.859 |
| Details | |
| Mass | 3,1 M☉ |
| Radius | 2,1 R☉ |
| Luminosity | 40 L☉ |
| Temperature | 7,500–10,000 K |
| Metallicity | ? |
| Rotation | 0,001892691 Year |
| Age | ? years |
| Orbit | |
| Companion | ξ Aquarii B |
| Period (P) | 21,9466119 yr |
| Semimajor axis (a) | 0.1" |
| Inclination (i) | 123° |
| Other designations | |
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HD 205767, 2MASS J21374510-0751150, ksi Aqr, GSC 05787-01291, N30 4769, TD1 28291, 23 Aqr, HERZ 16090, PLX 5208, TYC 5787-1291-1, MCA 68, PMC 90-93 1110, UBV M 25820, BD-08° 5701, HIP 106786, PPM 205412, UBV 18581, FK5 1569, HR 8264, ROT 3141, uvby98 100205767, GC 30268, IRAS 21350-0804, SAO 145537, YZ 98 7765, GCRV 13580, JP11 3371, SBC7 864.
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| Database references | |
| SIMBAD | data |
Xi Aquarii (ξ Aqr, ξ Aquarii) is a star in the constellation Aquarius. It has the traditional name Bunda.
In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Thanih Saad al Saaoud (تاني سعد السعود - taanii sa‘d al-su‘ūd), which was translated into Latin as Secunda Fortunæ Fortunarum, meaning the second of luck of lucks.[1]This star, along with β Aqr (Sadalsuud) and c Cet, were Saʽd al Suʽud (سعد السعود), the Luck of Lucks.[2][3]
In Chinese, 天壘城 (Tiān Lěi Chéng), meaning Celestial Ramparts, refers to an asterism consisting of ξ Aquarii, 46 Capricorni, 47 Capricorni, λ Capricorni, 50 Capricorni, 18 Aquarii, 29 Capricorni, 9 Aquarii, 8 Aquarii, ν Aquarii, 14 Aquarii, 17 Aquarii and 19 Aquarii.[4] Consequently, ξ Aquarii itself is known as 天壘城一 (Tiān Lěi Chéng yī, English: the First Star of Celestial Ramparts.)[5]
Bunda belongs to the spectral class A7V and has a stellar magnitude of +4.68. It is approximately 179 light-years from Earth. It is a spectroscopic binary which completes one orbit every 8016 days.
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