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Star in the constellation Aquarius
IZ Aquarii
Observation dataEpoch J2000 Equinox J2000
Constellation
Aquarius
Right ascension 21h 34m 42.768123s [ 2]
Declination
+01° 49′ 44.95678″[ 2]
Apparent magnitude (V)6.41[ 3] [ 4]
Characteristics
Spectral type
M4 III[ 5]
B−V color index
± 0.015[ 3]
Variable type
irregular variable
Astrometry Radial velocity (Rv )± 0.26[ 3] Proper motion (μ) RA: +13.153[ 2] mas /yr Dec.: −8.518[ 2] mas /yr Parallax (π)3.4739 ± 0.2458 mas [ 2] Distance 940 ± 70 ly pc ) Absolute magnitude (MV )−0.75[ 3] Details[ 3] Radius 44.4 R ☉ Luminosity 390.92 L ☉ Temperature 3303 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 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] 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 variable star designation in 1999.[ 7]
^ "/ftp/cats/more/HIP/cdroms/cats" . Centre de Données astronomiques de Strasbourg . Strasbourg astronomical Data Center. Retrieved 15 October 2022 .^ 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 ^ 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 . ^ a b Watson, Christopher (4 January 2010). "IZ Aquarii" . The International Variable Star Index . American Association of Variable Star Observers . Retrieved 13 July 2015 . ^ 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 . ^ "HD 205358" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 20 August 2018 .^ 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 .
