82 Aquarii

82 Aquarii is a star in the equatorial constellation of Aquarius. 82 Aquarii is its Flamsteed designation. It has an apparent visual magnitude of 6.15,[2] which, according to the Bortle Dark-Sky Scale, means it is a faint star that requires dark rural skies to view. The annual parallax shift of 82 Aquarii is 3.6764±0.1715 mas, which equates to a distance of roughly 890 light-years (270 parsecs) from Earth.[6] Because this star is positioned near the ecliptic, it is subject to lunar eclipses.[7]

82 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 02m 32.55694s[1]
Declination –06° 34′ 26.4458″[1]
Apparent magnitude (V) 6.15[2]
Characteristics
Evolutionary stage giant
Spectral type M2 III[3]
U−B color index +1.90[2]
B−V color index +1.58[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)−3.59±0.17[1] km/s
Proper motion (μ) RA: –7.224[1] mas/yr
Dec.: –33.786[1] mas/yr
Parallax (π)3.6764 ± 0.1715[1] mas
Distance890 ± 40 ly
(270 ± 10 pc)
Details
Radius56.33+5.50
−7.78[1] R☉
Luminosity692.8±37.1[1] L☉
Temperature3,946+305
−180[1] K
Other designations
82 Aqr, NSV 25999, BD−07°5913, HD 217701, HIP 113781, HR 8763, SAO 146465[5]
Database references
SIMBADdata

This object is an aging red giant star currently on the asymptotic giant branch[8] with a stellar classification of M2 III,[3] having exhausted both the hydrogen and helium at its core and expanded to 56 times the Sun's radius.[1] It is a suspected variable star of unknown type that ranges in magnitude between 6.24 and 6.29.[4] The star is radiating 693 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,946 K.[1]

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. Gaia DR2 record for this source at VizieR.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. Kimeswenger, S.; et al. (January 2004), "J - K DENIS photometry of a VLTI-selected sample of bright southern stars", Astronomy and Astrophysics, 413 (3): 1037–1043, Bibcode:2004A&A...413.1037K, doi:10.1051/0004-6361:20031576.
  4. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  5. "82 Aqr -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-16.
  6. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  7. Meyer, C.; et al. (1995), "Observations of lunar occultations at Observatoire de la Cote d'Azur", Astronomy and Astrophysics Supplement, 110: 107, Bibcode:1995A&AS..110..107M.
  8. Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
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