Pi1 Pegasi

Pi1 Pegasi
Location of π2 Pegasi (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
Right ascension 22h 09m 13.633s[1]
Declination +33° 10′ 20.41″[1]
Apparent magnitude (V) +5.595[2]
Characteristics
Spectral type G6 III
Astrometry
Radial velocity (Rv)+8.50±0.1 km/s
Proper motion (μ) RA: −61.14±0.32[1] mas/yr
Dec.: −66.84±0.32[1] mas/yr
Parallax (π)11.30 ± 0.30[1] mas
Distance289 ± 8 ly
(88 ± 2 pc)
Absolute magnitude (MV)0.84[3]
Details
Mass1.92[3] M☉
Radius9[4] R☉
Luminosity201.6[3] L☉
Surface gravity (log g)2.7[4] cgs
Temperature4793[3] K
Metallicity [Fe/H]-0.22[3] dex
Rotational velocity (v sin i)4.0[4] km/s
Other designations
π1 Peg, 27 Peg, BD+32 4349, HD 210354, HIP 109352, HR 8449, SAO 72064.[2]
Database references
SIMBADdata

Pi1 Pegasi (π1 Pegasi) is a star in the constellation Pegasus. Of apparent magnitude 5.59, its brightness is dimmer by 0.05 magnitude due to interstellar extinction. It is a yellow giant 1.92 times as massive as the Sun and 201.6 times as luminous.[3] Based upon changes to the proper motion of the visible component, this is a probable astrometric binary.[5]

References

  1. 1 2 3 4 5 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. 1 2 SIMBAD, Pi1 Pegasi (accessed 16 March 2016)
  3. 1 2 3 4 5 6 Takeda, Yoichi; Sato, Bun'ei; Murata, Daisuke (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781
  4. 1 2 3 Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  5. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.


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