| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 22m 20.4s |
| Declination | +45° 31' 44" |
| Apparent magnitude (V) | +4.87 |
| Distance | 196 ± 8 ly (60 ± 3 pc) |
| Spectral type | K0-IIIb |
| Other designations | |
Xi Andromedae (ξ And, ξ Andromedae) is a binary star in the constellation Andromeda. It bears the traditional name Adhil, which is derived from the Arabic الذيل að-ðayl "the train" (lit. "the tail"). It has an apparent magnitude of +4.875.
Xi Andromedae is actually a spectroscopic binary, two stars rotating too closely to each other to be separated other than by difference in their respective spectra. Orbiting each other every 17.77 days, the two stars lie around 196 light years from the Earth, (parallax of 16.68 mas).
John Flamsteed did not designate this star Bayer Cha. as number 46th of Andromeda in his star catalogue and atlas. He wrongly designated "ξ" for his 49th of Andromeda (Bayer's "A" And).
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