EW Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 11m 41.33828s |
| Declination | −14° 28′ 20.5579″ |
| Apparent magnitude (V) | 6.41 - 6.48[1] |
| Characteristics | |
| Spectral type | A8III[1] |
| U−B color index | 0.14 |
| B−V color index | 0.28 |
| Variable type | Delta Scuti |
| Astrometry | |
| Radial velocity (Rv) | -39.2 ± 2 km/s |
| Proper motion (μ) | RA: 39.26 ± 0.61 mas/yr Dec.: 0.23 ± 0.23 mas/yr |
| Parallax (π) | 7.97 ± 0.51 mas |
| Distance | 410 ± 30 ly (125 ± 8 pc) |
| Details | |
| Mass | 1.7 M☉ |
| Radius | 1.4 R☉ |
| Luminosity | 31[2] L☉ |
| Temperature | 7163[2] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
EW Aquarii is a star in the constellation Aquarius. A low amplitude Delta Scuti variable, it varies between magnitudes 6.41 and 6.48 over 2.16 hours.[1] Located around 410 light-years distant, it shines with a luminosity approximately 31 times that of the Sun and has a surface temperature of 7163 K.[2]
References
- 1 2 3 Watson, Christopher (4 January 2010). "EW Aquarii". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 4 June 2015.
- 1 2 3 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037
. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
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