Astronomy:28 Aquarii

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Short description: Star in the constellation Aquarius
28 Aquarii
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  22h 01m 05.01544s[1]
Declination +00° 36′ 16.9787″[1]
Apparent magnitude (V) 5.597[2]
Characteristics
Spectral type K2III[3]
U−B color index +1.40[4]
B−V color index +1.28[4]
Astrometry
Radial velocity (Rv)+8.12±0.1[5] km/s
Proper motion (μ) RA: +6.22[6] mas/yr
Dec.: −11.05[6] mas/yr
Parallax (π)5.7956 ± 0.1557[1] mas
Distance560 ± 20 ly
(173 ± 5 pc)
Details[7]
Mass1.47 M☉
Radius28.15+0.61
−0.93[1] R☉
Luminosity258±8[1] L☉
Surface gravity (log g)2.3 cgs
Temperature4,361 K
Age2.9 Gyr
Other designations
28 Aqr, BD−00° 4296, HD 209128, HIP 108691, HR 8390, SAO 127235[8]
Database references
SIMBADdata

28 Aquarii is a single[9] star located about 560 light years away from the Sun in the zodiac constellation of Aquarius. 28 Aquarii is the Flamsteed designation.[8] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.6.[2] This object is moving further from the Earth with a heliocentric radial velocity of +8.1 km/s.[5]

This 2.9[7] billion year old object is an aging giant star with a stellar classification of K2 III.[3] After exhausting the hydrogen at its core, this star evolved off the main sequence and has now expanded to 28[1] times the Sun's radius. It has 1.47 times the mass of the Sun and is radiating 258[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,361 K.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H. 
  4. ↑ 4.0 4.1 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode: 1966CoLPL...4...99J. 
  5. ↑ 5.0 5.1 Nidever, David L.; Marcy, Geoffrey W.; Butler, R. Paul; Fischer, Debra A.; Vogt, Steven S. (2002). "Radial Velocities for 889 Late‐Type Stars". The Astrophysical Journal Supplement Series 141 (2): 503–522. doi:10.1086/340570. Bibcode: 2002ApJS..141..503N. 
  6. ↑ 6.0 6.1 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  7. ↑ 7.0 7.1 7.2 Martig, Marie; Fouesneau, Morgan; Rix, Hans-Walter; Ness, Melissa; Mészáros, Szabolcs; García-Hernández, D. A.; Pinsonneault, Marc; Serenelli, Aldo et al. (2016). "Red giant masses and ages derived from carbon and nitrogen abundances". Monthly Notices of the Royal Astronomical Society 456 (4): 3655. doi:10.1093/mnras/stv2830. Bibcode: 2016MNRAS.456.3655M. 
  8. ↑ 8.0 8.1 "* 28 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+28+Aqr. 
  9. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 



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