IZ Aquarii

IZ Aquarii

A light curve for IZ Aquarii, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 21h 34m 42.768123s[2]
Declination +01° 49′ 44.95678″[2]
Apparent magnitude (V) 6.41[3] (6.23 - 6.47)[4]
Characteristics
Spectral type M4 III[5]
B−V color index 1.398±0.015[3]
Variable type irregular variable
Astrometry
Radial velocity (Rv)−20.48±0.26[3] km/s
Proper motion (μ) RA: +13.153[2] mas/yr
Dec.: −8.518[2] mas/yr
Parallax (π)3.4739 ± 0.2458 mas[2]
Distance940 ± 70 ly
(290 ± 20 pc)
Absolute magnitude (MV)−0.75[3]
Details[3]
Radius44.4 R☉
Luminosity390.92 L☉
Temperature3303 K
Other designations
IZ Aqr, AG+01° 2614, BD+01° 4503, FK5 5868, GC 30209, HD 205358, HIP 106544, SAO 126901, PPM 171943, TYC 542-105-1, GSC 00542-00105, IRAS 21321+0136, 2MASS J21344276+0149447[6]
Database references
SIMBADdata

IZ Aquarii is a red giant star in the constellation Aquarius. It is a slow irregular variable that varies between magnitudes 6.23 and 6.47.[4] It is can be seen by the naked eye as a very faint star by an observer at an excellent dark-sky location.

The star's variability was first detected in the Hipparcos satellite data, and it was given its variable star designation in 1999.[7]

References

  1. ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  2. ^ a b c d e 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.
  3. ^ a b c d e 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. S2CID 119257644.
  4. ^ a b Watson, Christopher (4 January 2010). "IZ Aquarii". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 13 July 2015.
  5. ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 05: 0. Bibcode:1999MSS...C05....0H.
  6. ^ "HD 205358". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 August 2018.
  7. ^ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4659. Bibcode:1999IBVS.4659....1K. Retrieved 10 October 2024.


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