HD 97658

HD 97658
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Leo[1]
Right ascension 11h 14m 33.1613s[2]
Declination +25° 42′ 37.392″[2]
Apparent magnitude (V) 7.762±0.012[3]
Characteristics
Evolutionary stage Main sequence[4]
Spectral type K1V[5]
B−V color index 0.843±0.022[3]
Variable type Planetary transit variable
Astrometry
Radial velocity (Rv)−1.579±0.0011[6] km/s
Proper motion (μ) RA: −107.534±0.091 mas/yr[2]
Dec.: 48.662±0.090 mas/yr[2]
Parallax (π)46.412 ± 0.022 mas[7]
Distance70.27 ± 0.03 ly
(21.55 ± 0.01 pc)
Absolute magnitude (MV)6.14[8]
Details
Mass0.773+0.015
−0.018[7] M☉
Radius0.728±0.008[7] R☉
Luminosity (bolometric)0.351±0.007[7] L☉
Surface gravity (log g)4.52 ± 0.06[3] cgs
Temperature5212±43[7] K
Metallicity [Fe/H]−0.30±0.03[3] dex
Rotation38.5±1.0[3]
Rotational velocity (v sin i)0.92±0.05[3] km/s
Age3.9+2.6
−2.03[7] Gyr
Other designations
BD+26° 2184, GJ 3651, HD 97658, HIP 54906, SAO 81730, GSC 01981-01168, 2MASS J11143316+2542374[9]
Database references
SIMBADdata

HD 97658 is a star with an exoplanetary companion in the equatorial constellation of Leo. The star is too dim to be seen with the naked eye, having an apparent visual magnitude of 7.76.[3] It is located at a distance of 70 light years based on parallax, but is slowly drifting closer with a radial velocity of −1.6 km/s.[6]

This is an ordinary K-type main-sequence star with a stellar classification of K1V.[5] The star has 77% of the mass and 73% of the radius of the Sun.[7] Estimates of the star's age ranges from four to six billion years.[7] It is spinning with a rotation period of around 39 days[3] and shows a magnetic activity cycle of 9.6 years, which is slightly shorter than the solar cycle. The chromospheric activity is lower than average for stars of this class.[10]

HD 97658 is radiating 35% of the luminosity of the Sun from its photosphere at an effective temperature of 5,212 K.[7] The star has a low metallicity – the atmospheric abundance of elements with a higher atomic number than helium, which explains why it lies 0.46 magnitudes below average for main sequence stars of its type.[4]

  1. ^ Cite error: The named reference Roman1987 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h Cite error: The named reference transit was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Howard2011 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Koen_et_al_2010 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  7. ^ a b c d e f g h i Cite error: The named reference Ellis2021 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson_Francis_2012 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 Guo2020 was invoked but never defined (see the help page).