HD 220466

Last updated
HD 220466
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Aquarius
Right ascension 23h 24m 03.97947s [1]
Declination −21° 46′ 27.8819″ [1]
Apparent magnitude  (V)6.50 [2]
Characteristics
Spectral type F3IV/V [3]
U−B color index −0.03 [2]
B−V color index +0.42 [2]
Astrometry
Radial velocity (Rv)24.5 [4]  km/s
Proper motion (μ)RA: −67.70 [1]   mas/yr
Dec.: −77.45 [1]   mas/yr
Parallax (π)15.99 ± 0.72 [1]   mas
Distance 204 ± 9  ly
(63 ± 3  pc)
Absolute magnitude  (MV)2.50 [5]
Details
Mass 1.47 (1.41 to 1.52) [6]   M☉
Temperature 6,456 [5]   K
Metallicity [Fe/H]−0.18 [5]   dex
Age 2.0 [5]   Gyr
Other designations
BD−22°6119, HD 220466, HIP  115522, SAO  191873.
Database references
SIMBAD data

HD 220466 is a F-type subgiant or main sequence star in the constellation Aquarius. It has apparent magnitude 6.47 and is about 200 light-years away. [1] In 1913, an apparent visual companion of apparent magnitude 10.3 was observed 1.9 arcseconds away from the star, [7] but it is doubtful whether it exists. [8]

Stellar classification Classification of stars based on their spectral characteristics

In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines. Each line indicates a particular chemical element or molecule, with the line strength indicating the abundance of that element. The strengths of the different spectral lines vary mainly due to the temperature of the photosphere, although in some cases there are true abundance differences. The spectral class of a star is a short code primarily summarizing the ionization state, giving an objective measure of the photosphere's temperature.

Subgiant type of star larger than main-sequence but smaller than a giant

A subgiant is a star that is brighter than a normal main-sequence star of the same spectral class, but not as bright as true giant stars. The term subgiant is applied both to a particular spectral luminosity class and to a stage in the evolution of a star.

Main sequence A continuous band of stars that appears on plots of stellar color versus brightness

In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell. Stars on this band are known as main-sequence stars or dwarf stars. These are the most numerous true stars in the universe, and include the Earth's Sun.

Related Research Articles

Mu Virginis star in the zodiac constellation of Virgo

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Zeta Trianguli Australis is a spectroscopic binary in the constellation Triangulum Australe. It is approximately 39.5 light years from Earth.

Theta Boötis is a main sequence star in the constellation Boötes, about 47 light years away. It has the traditional name Asellus Primus and the Flamsteed designation 23 Boötis.

HD 211415 is a double star in the constellation Grus. With an apparent visual magnitude of 5.33, it is visible to the naked eye. The annual parallax shift is 72.54 mas, which yields a distance estimate of 45 light years. It has a relatively high proper motion, traversing the celestial sphere at the rate of 93.4 mas per year, and is moving closer to the Sun with a radial velocity of −13 km/s.

HD 4628 is a main sequence star in the equatorial constellation of Pisces. It has a spectral classification of K2.5 V and an effective temperature of 5,829 K, giving it an orange-red hue with a slightly smaller mass and girth than our Sun. HD 4628 lies at a distance of approximately 24.3 light years from the Sun. The apparent magnitude is just sufficient for this star to be viewed with the unaided eye. The star appears to be slightly older than our Sun—approximately 5.4 billion years old. The surface activity is low and, based upon the detection of UV emission, it may have a relatively cool corona with a temperature of one million K.

HR 511 star

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2 Centauri is a star in the constellation Centaurus.

HD 125072 is K3-IV class star in the constellation Centaurus. The components of the space velocity for this star are U=−18.5, V=−6.9 and W=−26.9 km/s. Based on the composition and kinematics of this star, it has an estimated age of about 10 billion years.

HD 200375 is a binary star system in the equatorial constellation of Aquarius. Their orbit does not yet have a unique solution available.

HD 214810 is a visual binary star in the equatorial constellation of Aquarius. The pair orbit each other with a period of about 54.2 years.

HD 180262 is a wide double star in the equatorial constellation of Aquila. The pair have an angular separation of 89.823″.

HD 149837 is a binary star in the southern constellation of Ara.

HD 35984 is star in the northern constellation Auriga. It has an apparent magnitude of 6.20, which, according to the Bortle scale, indicates it is faintly visible to the naked eye from dark rural skies. Parallax measurements by the Hipparcos satellite indicates it lies at a distance of roughly 290 light years away.

HD 130603 is a double star in the northern constellation of Boötes. As of 2010.476, the components have an angular separation of 2.06″ along a position angle of 54.7°.

HD 128093 is a double star in the constellation Boötes. The brighter component is an F-type main sequence star with a stellar classification of F5V and an apparent magnitude of 6.33. It has a magnitude 11.33 companion at an angular separation of 28.1 along a position angle of 318°.

Chi Ceti , is the Bayer designation for a double star in the equatorial constellation of Cetus. They appear to be common proper motion companions, sharing a similar motion through space. The brighter component, HD 11171, is visible to the naked eye with an apparent visual magnitude of 4.66, while the fainter companion, HD 11131, is magnitude 6.75. Both lie at roughly the same distance, with the brighter component lying at an estimated distance of 75.6 light years from the Sun based upon an annual parallax shift of 43.13 mass.

HD 93194 star

HD 93194 is a star in the constellation Carina. Its apparent magnitude is 4.79. Its parent cluster is IC 2602.

45 Eridani is a star in the constellation Eridanus. Its apparent magnitude is 4.896.

Lambda Coronae Borealis Star in the constellation Corona Borealis

Lambda Coronae Borealis, Latinised from λ Coronae Borealis, is a star located in the constellation Corona Borealis, at a distance of 41.6 parsecs (136 ly). It is also known as HR 5936, and HD 142908.

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References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752  Lock-green.svg. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 1 2 3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
  3. ↑ Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H
  4. ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053  Lock-green.svg. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. 1 2 3 4 Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv: 0811.3982  Lock-green.svg, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191
  6. ↑ HD 220466, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line November 19, 2008.
  7. ↑ CCDM 23241-2146, database entry, Catalog of Components of Double and Multiple Stars, CDS ID I/211. Accessed on line July 22, 2008.
  8. ↑ 23241-2146, entry, Notes file Archived 2008-04-13 at the Wayback Machine ., Washington Double Star Catalogue. Accessed on line July 22, 2008.
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