Pi2 Pegasi

For other stars with this Bayer designation see π Pegasi
π2 Pegasi
Location of π2 Pegasi (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
Right ascension 22h 09m 59.24371s[1]
Declination +33° 10′ 41.5976″ [1]
Apparent magnitude (V) +4.28[2]
Characteristics
Spectral type F5 III[3]
B−V color index 0.471±0.012[2]
Astrometry
Radial velocity (Rv)+5.1±0.9[2] km/s
Proper motion (μ) RA: −12.87±0.12[1] mas/yr
Dec.: −18.95±0.16[1] mas/yr
Parallax (π)12.40 ± 0.17 mas[1]
Distance263 ± 4 ly
(81 ± 1 pc)
Absolute magnitude (MV)0.21[4]
Details
Mass2.48[5] M☉
Radius8.5±0.8[6] R☉
Luminosity102.9±2.6[6] L☉
Temperature6,300+298
−263[6] K
Rotational velocity (v sin i)139.7[4] km/s
Age530[5] Myr
Other designations
π2 Peg, 29 Pegasi, BD+32°4352, FK5 835, HD 210459, HIP 109410, HR 8454, SAO 72077[7]
Database references
SIMBADdata

π2 Pegasi, Latinized as Pi2 Pegasi, is a single[8] star in the northern constellation Pegasus. It is yellow-white in hue and visible to the naked eye as a faint point of light with an apparent visual magnitude of +4.28.[2] The distance to this object is approximately 263 light years based on parallax,[1] and it is drifting further away with a radial velocity of +5 km/s.[2] This star is an outlying member of the Ursa Major Moving Group.[9]

π1 Pegasi (right) and π2 Pegasi (left) in optical light

This object has a stellar classification of F5 III,[3] matching an aging giant star that has exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. At present it has 8.5[6] times the radius of the Sun. The star is 530[5] million years old with 2.48[5] times the Sun's mass. It shows a high rotation rate considering its evolutionary status, with a projected rotational velocity of 140 km/s.[4] The star has been noted as a possible variable shell star.[10] Pi2 Pegasi is radiating 103 times the Sun's luminosity from its swollen photosphere at an effective temperature of 6,300 K.[6]

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Herbig1955 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Reiners2006 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Chupina2006 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Hauck2000 was invoked but never defined (see the help page).