28 Aquarii

28 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 01m 05.01458s[1]
Declination +00° 36′ 16.9803″[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[1] mas/yr
Dec.: -11.05[1] mas/yr
Parallax (π)4.56 ± 0.45[1] mas
Distance720 ± 70 ly
(220 ± 20 pc)
Details[6]
Mass1.47 M☉
Surface gravity (log g)2.3 cgs
Temperature4361 K
Age2.9 Gyr
Other designations
BD−00° 4296, HD 209128, HIP 108691, HR 8390, SAO 127235[7]
Database references
SIMBADdata

28 Aquarii (abbreviated 28 Aqr) is an orange giant star in the constellation of Aquarius. 28 Aquarii is the Flamsteed designation. It is 2.9 billion years old.[6]

References

  1. 1 2 3 4 5 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ↑ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. ↑ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5: 0. Bibcode:1999MSS...C05....0H.
  4. 1 2 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  5. ↑ 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. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570.
  6. 1 2 Martig, Marie; Fouesneau, Morgan; Rix, Hans-Walter; Ness, Melissa; Mészáros, Szabolcs; García-Hernández, D. A.; Pinsonneault, Marc; Serenelli, Aldo; Aguirre, Victor Silva; Zamora, Olga (2016). "Red giant masses and ages derived from carbon and nitrogen abundances". Monthly Notices of the Royal Astronomical Society. 456 (4): 3655. arXiv:1511.08203. Bibcode:2016MNRAS.456.3655M. doi:10.1093/mnras/stv2830.
  7. ↑ "* 28 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 January 2018.
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