IZ Aquarii

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IZ Aquarii
IZAqrLightCurve.png
A light curve for IZ Aquarii, plotted from Hipparcos data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Aquarius [2]
Right ascension 21h 34m 42.76812s [3]
Declination +01° 49′ 44.9568″ [3]
Apparent magnitude  (V)6.23 - 6.47 [4]
Characteristics
Spectral type M4 III [5]
B−V color index 1.398±0.015 [2]
Variable type LB [4]
Astrometry
Radial velocity (Rv)−20.48±0.26 [2] km/s
Proper motion (μ)RA: +13.153 [3] mas/yr
Dec.: −8.518 [3] mas/yr
Parallax (π)3.4739±0.2458  mas [3]
Distance 940 ± 70  ly
(290 ± 20  pc)
Absolute magnitude  (MV)−0.75 [2]
Details
Mass 2.5 [6]   M☉
Radius 44.4 [2]   R☉
Luminosity 390.92 [2]   L☉
Surface gravity (log g)1.44 [6]   cgs
Temperature 3,303 [2]   K
Metallicity [Fe/H]−0.59 [6]   dex
Other designations
IZ Aqr, AAVSO 2129+01, 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 [7]
Database references
SIMBAD data

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 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. [8]

References

  1. ↑ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  2. 1 2 3 4 5 6 7 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.
  3. 1 2 3 4 5 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 .
  4. 1 2 3 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. 1 2 3 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv: 2407.06963 . Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
  7. ↑ "HD 205358". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 20 August 2018.
  8. ↑ 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: 1. Bibcode:1999IBVS.4659....1K . Retrieved 10 October 2024.


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