33 Pegasi

33 Pegasi is the Flamsteed designation for a visual binary star in the northern constellation of Pegasus. It has an apparent visual magnitude of 6.2,[2] placing it near the limit of naked eye visibility. Measurements made with the Hipparcos spacecraft show an annual parallax shift of 0.02967″,[1] which is equivalent to a distance of roughly 110 ly (34 pc) from the Sun.

33 Pegasi
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension  22h 23m 39.56438s[1]
Declination 20° 50′ 53.6239″[1]
Apparent magnitude (V) 6.203[2] (6.391/9.287)[3]
Characteristics
Spectral type F7 V[4]
Astrometry
Radial velocity (Rv)23.8 ± 0.4[2] km/s
Proper motion (μ) RA: +334.55[1] mas/yr
Dec.: –14.86[1] mas/yr
Parallax (π)29.67 ± 0.65[1] mas
Distance110 ± 2 ly
(33.7 ± 0.7 pc)
Absolute magnitude (MV)3.55[2]
Details
33 Peg A
Surface gravity (log g)4.29[5] cgs
Temperature6,169[6] K
Metallicity [Fe/H]–0.18[6] dex
Rotational velocity (v sin i)6[2] km/s
Age4.1[6] Gyr
Other designations
33 Peg, BD–16 4196, HD 212395, HIP 110548, HR 8532, SAO 90462.[7]
Database references
SIMBADdata

The primary component of this system is a main sequence star with a visual magnitude of 6.4[3] and a stellar classification of F7 V.[4] It is nearly as old as the Sun with an estimated age of 4.1 billion years, but has a lower abundance of elements other than hydrogen and helium. The stellar atmosphere has an effective temperature of 6,169 K,[6] giving it the yellow-white glow of an F-type star.[8]

A faint, magnitude 9.3 companion star is located at an angular separation of 0.420 arc seconds along a position angle of 0.0°.[3] The orbital period of this pair is large enough that it has not been computed based on current observations.[9]

References
  1. van Leeuwen, F. (November 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. Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418: 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959.
  3. Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics, 356: 141–145, Bibcode:2000A&A...356..141F.
  4. Harlan, E. A.; Taylor, D. C. (March 1970), "MK classification for F- and G-type stars. II", Astronomical Journal, 75 (2): 165–166, Bibcode:1970AJ.....75..165H, doi:10.1086/110956.
  5. Boesgaard, Ann Merchant; et al., "The Correlation of Lithium and Beryllium in F and G Field and Cluster Dwarf Stars", The Astrophysical Journal, 613: 1202–1212, Bibcode:2004ApJ...613.1202B, doi:10.1086/423194.
  6. Casagrande, L.; et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
  7. "* 33 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2013-12-31.
  8. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-01-16.
  9. Söderhjelm, Staffan (January 1999), "Visual binary orbits and masses post Hipparcos", Astronomy and Astrophysics, 341: 121–140, Bibcode:1999A&A...341..121S.

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