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
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]
Distance 940 ± 70  ly
(290 ± 20  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] 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]

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<span class="mw-page-title-main">47 Capricorni</span> Star in the constellation Capricornus

47 Capricorni is a variable star located around 1,170 light years from the Sun in the southern constellation Capricornus, near the northern border with Aquarius. It has the variable star designation of AG Capricorni and a Bayer designation of c2 Capricorni; 47 Capricorni is the Flamsteed designation. This object is visible to the naked eye as a dim, red-hued point of light with an apparent visual magnitude that varies between 5.90 and 6.14. The star is receding from the Earth with a heliocentric radial velocity of +20 km/s.

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 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. 1 2 3 4 5 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. 1 2 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.