1 Aquarii
 
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 20h 39m 24.8915s[1] |
| Declination | +00° 29′ 11.201″[1] |
| Apparent magnitude (V) | 5.16[2] |
| Characteristics | |
| Spectral type | K1III[2] |
| U−B color index | +0.97 |
| B−V color index | +1.06[2] |
| Astrometry | |
| Radial velocity (Rv) | −42.81[3] km/s |
| Proper motion (μ) | RA: 101.95[1] mas/yr Dec.: −20.50[1] mas/yr |
| Parallax (π) | 13.99 ± 0.65 mas |
| Distance | 230 ± 10 ly (71 ± 3 pc) |
| Absolute magnitude (MV) | 0.77[4] |
| Details | |
| Temperature | 3,500–5,000 K |
| Metallicity | −0.12[4] |
| Rotation | 1.8[4] |
| Age | ~5 × 109 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
1 Aquarii (abbreviated 1 Aqr) is a multiple star in the constellation Aquarius. 1 Aquarii is the Flamsteed designation. It is a K-class giant of the spectral type K1III. Its companions, B and C, are optical and have no physical relation to 1 Aqr A. 1 Aquarii is known to be an infra-red source.
Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Database references |
|---|---|---|---|---|
| 1 Aquarii B (BD-00 4064B) | 20h 39m 21.8s | +00° 28' 25 | 11.5 | Simbad |
| 1 Aquarii C (BD-00 4064C) | 20h 39m 27.1s | +00° 30' 07 | 11.3 | Simbad |
References
- 1 2 3 4 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 2 3 Hoffleit, Dorrit; Jaschek, Carlos (1991). "The Bright star catalogue". New Haven. Bibcode:1991bsc..book.....H.
- ↑ Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity". The Astronomical Journal 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
- 1 2 3 Pace, G.; Pasquini, L.; Ortolani, S. (2003). "The Wilson-Bappu effect: A tool to determine stellar distances". Astronomy and Astrophysics 401 (3): 997. Bibcode:2003A&A...401..997P. doi:10.1051/0004-6361:20030163.
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