| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 25m 16.6232s |
| Declination | +01° 22′ 38.642″ |
| Apparent magnitude (V) | 4.760 |
| Characteristics | |
| Spectral type | B1Ve |
| U−B color index | -0.98 |
| B−V color index | -0.03 |
| Variable type | Gamma Cassiopeiae |
| Astrometry | |
| Radial velocity (Rv) | 4 km/s |
| Proper motion (μ) | RA: 18.38 mas/yr Dec.: 3.35 mas/yr |
| Parallax (π) | 2.96 ± 0.71 mas |
| Distance | approx. 1100 ly (approx. 340 pc) |
| Absolute magnitude (MV) | 4.568 |
| Details | |
| Mass | 18 M☉ |
| Radius | 7 R☉ |
| Luminosity | 20,000 L☉ |
| Temperature | 10,000–30,000 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Pi Aquarii or Seat (π Aqr, π Aquarii) is a star in the constellation Aquarius. The name Seat is shared with Delta Aquarii, where it has long been misspelled Skat. It may be from the Arabic word ši'at "a wish".
In Chinese, 墳墓 (Fén Mù), meaning Tomb, refers to an asterism consisting of π Aquarii, γ Aquarii, ζ Aquarii, η Aquarii.[1] Consequently, π Aquarii itself is known as 墳墓四 (Fén Mù sì, English: the Fourth Star of Tomb.)[2]
In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Wasat al Achbiya (وسط ألأجبية - wasath al ahbiyah), which was translated into Latin as Media Tabernaculorum, meaning the middle of luck of the homes (tents).[3]. This star, along with γ Aqr (Sadachbia), ζ Aqr (Sadaltager / Achr al Achbiya) and η Aqr (Hydria), were al Aḣbiyah (الأخبية), the Tent.[4][5][6]
Pi Aquarii is a blue-white B-type main sequence dwarf with a mean apparent magnitude of +4.57. It is approximately 1100 light years from Earth. It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +4.45 to +4.71 (a range of 0.28).
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