EW Aquarii

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.[3] Located around 439 light-years distant, it shines with a luminosity approximately 31 times that of the Sun and has a surface temperature of 7163 K.[4]

EW Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension  21h 11m 41.33844s[1]
Declination −14° 28′ 20.5590″[1]
Apparent magnitude (V) 6.47[2] (6.41 - 6.48)[3]
Characteristics
Spectral type A8 III[3]
B−V color index 0.316±0.007[2]
Variable type δ Sct[3]
Astrometry
Radial velocity (Rv)−39.2±2.9[2] km/s
Proper motion (μ) RA: +39.263[1] mas/yr
Dec.: +0.614[1] mas/yr
Parallax (π)7.4366 ± 0.0435[1] mas
Distance439 ± 3 ly
(134.5 ± 0.8 pc)
Absolute magnitude (MV)0.99[2]
Details
Luminosity31[4] L☉
Temperature7,163[4] K
Other designations
BD−15° 5908, FK5 5868, HD 201707, HIP 104634, HR 8102, SAO 164204[5]
Database references
SIMBADdata

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  3. Watson, Christopher (4 January 2010). "EW Aquarii". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 4 June 2015.
  4. 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.
  5. "HD 199603". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 August 2018.


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