Nu Pegasi

Nu Pegasi
Location of ν Pegasi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 22h 05m 40.75170s[1]
Declination 5° 03′ 30.7201″[1]
Apparent magnitude (V) 4.84[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K4III[4]
U−B color index +1.80[2]
B−V color index +1.44[2]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)−18.90[6] km/s
Proper motion (μ) RA: +101.759[7] mas/yr
Dec.: +100.923[7] mas/yr
Parallax (π)12.4810 ± 0.3322 mas[7]
Distance261 ± 7 ly
(80 ± 2 pc)
Absolute magnitude (MV)0.26[8]
Details[9]
Mass1.13 M☉
Radius24.57 R☉
Luminosity149 L☉
Surface gravity (log g)1.72 cgs
Temperature4,073 K
Metallicity [Fe/H]+0.02 dex
Rotational velocity (v sin i)2.3[10] km/s
Age8.1+2.3
−0.4[3] Gyr
Other designations
ν Peg, 22 Pegasi, NSV 14020, BD+04°4800, GC 30894, HD 209747, HIP 109068, HR 8413, SAO 127285[11]
Database references
SIMBADdata

ν Pegasi, Latinized as Nu Pegasi is a single[12] star in the northern constellation of Pegasus. It is an orange-hued star that is faintly visible to the naked eye with an apparent visual magnitude of 4.84.[2] The star is located approximately 261 light years away based on parallax,[7] but is drifting closer with a radial velocity of −19 km/s.[6]

This is an aging giant star, most likely (94% chance) on the red giant branch,[3] with a stellar classification of K4III.[4] It is a suspected variable, with a magnitude range observed from 4.83 to 4.86.[5] With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 24.6 times the Sun's radius. It is 13% more massive than the Sun and is radiating 149 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,073 K.[9]

  1. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Stock2018 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference dr2 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Reffert2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference deMedeiros1999 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).