U Aquarii
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 03m 19.6992s[1] |
| Declination | −16° 37′ 35.288″[1] |
| Apparent magnitude (V) | 10.6 to 15.9[2] |
| Characteristics | |
| B−V color index | 1.0[1] |
| V−R color index | 0.4[1] |
| Variable type | RCB[2] |
| Astrometry | |
| Proper motion (μ) | RA: 3.03[1] mas/yr Dec.: −2.53[1] mas/yr |
| Parallax (π) | 3.58 ± 2.55[1] mas |
| Distance | approx. 900 ly (approx. 300 pc) |
| Absolute magnitude (MV) | 6[NB 1] |
| Other designations | |
| Database references | |
| SIMBAD | data |
U Aquarii (U Aqr) is a star in the constellation of Aquarius.[1] It has an apparent visual magnitude which varies between 10.6 and 15.9.[2]
In 1999, U Aqr was proposed to be a Thorne-Zytkow object, instead of being a simple R Coronae Borealis variable.[3]
Notes
- ↑ From apparent magnitude and parallax.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 V* U Aqr -- Variable Star of R CrB type, database entry, SIMBAD. Accessed on line November 10, 2009.
- ↑ 2.0 2.1 2.2 U Aqr, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 10, 2009.
- ↑ Andrew D. Vanture, Daniel Zucker, George Wallerstein (April 1, 1999). "Is U Aquarii a Thorne-Żytkow Object?". The Astrophysical Journal 514 (2). Bibcode:1999ApJ...514..932V. doi:10.1086/306956.
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