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Rho Pegasi

Rho Pegasi
Location of ρ Pegasi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 22h 55m 13.66706s[1]
Declination 8° 48′ 58.2387″[1]
Apparent magnitude (V) 4.90[2]
Characteristics
Spectral type A1V[3]
U−B color index +0.00[2]
B−V color index +0.00[2]
Astrometry
Radial velocity (Rv)−10.6±0.9[4] km/s
Proper motion (μ) RA: +80.370[1] mas/yr
Dec.: +13.282[1] mas/yr
Parallax (π)11.9131 ± 0.2232 mas[1]
Distance274 ± 5 ly
(84 ± 2 pc)
Absolute magnitude (MV)+0.01[5]
Details
Mass2.84[6] M☉
Radius3.1[7] R☉
Luminosity110[6] L☉
Surface gravity (log g)3.90[8] cgs
Temperature9,484[6] K
Rotational velocity (v sin i)107[6] km/s
Age331[8] Myr
Other designations
ρ Peg, 50 Peg, BD+08° 4961, GC 31963, HD 216735, HIP 113186, HR 8717, SAO 127839[9]
Database references
SIMBADdata

Rho Pegasi, Latinized from ρ Pegasi, is a star in the northern constellation of Pegasus, near the southern constellation boundary with Pisces. This is a probable astrometric binary system, as determined by changes to the proper motion of the visible component.[10] It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.90.[2] The system is located at a distance of approximately 274 light years from the Sun based on parallax,[1] but it is drifting closer with a radial velocity of −10.6 km/s.[4]

This visible component is an A-type main-sequence star with a stellar classification of A1V.[3] The star is 331[8] million years old and is spinning with a projected rotational velocity of 107 km/s.[6] It has 2.8[6] times the mass of the Sun and 3.1[7] times the Sun's radius. The star is radiating 110[6] times the luminosity of the Sun from its photosphere at an effective temperature of 9,484 K.[6]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 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 Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  6. ^ a b c d e f g h Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference AllendePrieto was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).

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