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HD 210702

HD 210702
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus[1]
Right ascension 22h 11m 51.331s[2]
Declination +16° 02′ 26.00″[2]
Apparent magnitude (V) 5.93[1]
Characteristics
Evolutionary stage subgiant[3]
Spectral type K1 III[4] or K1 IV[3]
B−V color index 0.951±0.001[1]
Astrometry
Radial velocity (Rv)18.4593±0.0392[5] km/s
Proper motion (μ) RA: −3.263±0.156 mas/yr[2]
Dec.: −17.296±0.036 mas/yr[2]
Parallax (π)18.4593 ± 0.0392 mas[2]
Distance176.7 ± 0.4 ly
(54.2 ± 0.1 pc)
Absolute magnitude (MV)2.14[3]
Details
Mass1.47±0.04[6] M☉
Radius4.9±0.1[6] R☉
Luminosity12.9±0.1[6] L☉
Surface gravity (log g)3.2200±0.074[7] cgs
Temperature4,946±32[6] K
Metallicity [Fe/H]0.083±0.027[7] dex
Rotational velocity (v sin i)2.50±0.48[7] km/s
Age3.1±0.3[6] Gyr
Other designations
BD+15º4592, HD 210702, HIP 109577, HR 8461, SAO 107729[8]
Database references
SIMBADdata

HD 210702 is a star with an orbiting exoplanet in the northern constellation of Pegasus.[1] It has an apparent visual magnitude of 5.93,[1] which is bright enough that the star is dimly visible to the naked eye. The distance to HD 210702 is 177 light years based on parallax measurements, and it is drifting further away with a radial velocity of 18.5 km/s.[5] It is a probable member of the Ursa Major moving group, an association of co-moving stars.[4]

Although a stellar classification of K1 III[4] suggests this is an evolved giant star, it is more likely to be a subgiant star currently at the based of the red giant branch.[9] Currently 3[6] billion years old, HD 210702 spent its main-sequence life as an A-type star. Consistent with its evolutionary status, it has little or no magnetic activity in its chromosphere.[10] The star has 1.5[6] times the mass of the Sun and has expanded to 4.9 times the Sun's radius. It is radiating 12.9 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,946 K.[6]

  1. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Sato2012 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Levato_Abt_1978 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Hojjatpanah_et_al_2019 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Luhn2019 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Johnson2007 was invoked but never defined (see the help page).

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