From Wikipedia, the free encyclopedia Sigma Aquarii
Sigma Aquarii
σ Aquarii Radius 2.1 R☉
Observation data
Epoch J2000 Equinox J2000 Luminosity 40 L☉
Constellation Aquarius Temperature 7,500–10,000 K
Right ascension 22h 30m 38.8161s
Other designations
Declination -10° 40′ 40.62″
57 Aquarii, HR 8573, HD 213320, BD-11°5850, FK5 1591,
Apparent magnitude (V) 4.825 HIP 111123, SAO 165134, GC 31440, CCDM 22306-1041.
Characteristics Database references
Spectral type A0IVs SIMBAD data
U−B color index -0.11 Data sources:
B−V color index -0.06 Hipparcos Catalogue,
CCDM (2002),
Astrometry Bright Star Catalogue (5th rev. ed.)
Radial velocity (Rv) 11 km/s Sigma Aquarii (σ Aqr, σ Aquarii) is a double star in the
constellation Aquarius. It is approximately 265 light
Proper motion (μ) RA: 1.79 mas/yr
Dec.: -26.26 mas/yr years from Earth.
Sigma Aquarii is an astrometric binary. The visible
Parallax (π) 12.29 ± 1.32 mas component is a white A-type subgiant with an apparent
Distance approx. 270 ly magnitude of +4.82. The orbital period of the binary is 654
(approx. 81 pc) days.[citation needed]
Absolute magnitude (MV) 4.79
References
Details • Image Sigma Aquarii
Mass 3.1 M☉
Retrieved from "http://en.wikipedia.org/w/index.php?title=Sigma_Aquarii&oldid=404908830"
Categories:
• Subgiant star stubs
• Multiple star stubs
• Henry Draper Catalogue objects
• Bayer objects
• Aquarius constellation
• Astrometric binaries
• A-type subgiants
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