33 Pegasi

33 Pegasi
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 22h 23m 39.565s[1]
Declination 20° 50′ 53.84″[1]
Apparent magnitude (V) 6.203[2] (6.391 + 9.287)[3]
Characteristics
Spectral type F7 V[4]
B−V color index 0.518±0.004[5]
Astrometry
Radial velocity (Rv)23.8±0.4[2] km/s
Proper motion (μ) RA: +333.057 mas/yr[1]
Dec.: −10.827 mas/yr[1]
Parallax (π)29.8125 ± 0.0436 mas[1]
Distance109.4 ± 0.2 ly
(33.54 ± 0.05 pc)
Absolute magnitude (MV)3.55[2]
Details
33 Peg A
Mass1.28[6] M☉
Radius1.29+0.15
−0.14[7] R☉
Luminosity2.850+0.007
−0.008[7] L☉
Surface gravity (log g)4.29[8] cgs
Temperature6,169[9] K
Metallicity [Fe/H]–0.18[9] dex
Rotational velocity (v sin i)6[2] km/s
Age4.1[9] Gyr
33 Peg B
Mass0.80[6] M☉
Other designations
33 Peg, BD–16 4196, HD 212395, HIP 110548, HR 8532, SAO 90462[10]
Database references
SIMBADdata

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 show an annual parallax shift of 0.0298125″,[1] which is equivalent to a distance of 109 ly (33 pc) from the Sun. It is drifting further away with a radial velocity of 24 km/s.[2]

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 star has 1.3 times the mass[6] and radius[7] of the Sun. The stellar atmosphere has an effective temperature of 6,169 K,[9] giving it the yellow-white glow of an F-type star.[11]

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 pair have a projected separation of 15.6 AU[6] with an orbital period of about 250 years.[12]

  1. ^ a b c d e Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference aaa418_989 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference aaa356_141 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aj75_2_165 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Tokovinin_Kiyaeva_2015 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference ApJ530_A138 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Tokovinin2014 was invoked but never defined (see the help page).