HD 107148

HD 107148
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Virgo[1]
Right ascension 12h 19m 13.491s[2]
Declination −03° 19′ 11.24″[2]
Apparent magnitude (V) 8.01[1]
Characteristics
Evolutionary stage main sequence + white dwarf
Spectral type G5V[3] + DA[4]
B−V color index 0.707±0.013[1]
Astrometry
Radial velocity (Rv)25.244±0.0005[5] km/s
Proper motion (μ) RA: −54.565 mas/yr[2]
Dec.: −47.376 mas/yr[2]
Parallax (π)20.248 ± 0.0283 mas[2]
Distance161.1 ± 0.2 ly
(49.39 ± 0.07 pc)
Absolute magnitude (MV)4.47[1]
Position (relative to HD 107148 A)[4]
ComponentHD 107148 B
Epoch of observation2009
Angular distance34.9″
Position angle174.7°
Projected separation1,790 AU
Details[6]
HD 107148 A
Mass1.1±0.1 M☉
Radius1.15±0.03 R☉
Luminosity1.34±0.05 L☉
Surface gravity (log g)4.35±0.03 cgs
Temperature5,789±36 K
Metallicity [Fe/H]0.33±0.09[7] dex
Rotational velocity (v sin i)1.22±0.20[7] km/s
Age4±1 Gyr
HD 107148 B
Mass0.6[4] M☉
Temperature6250±250[4] K
Other designations
BD−02 3497, Gaia DR2 3693358861640279296, HD 107148, HIP 60081, SAO 138714, 2MASS J12191349-0319112[8]
Database references
SIMBADdata

HD 107148 is a wide binary star system in the constellation of Virgo. A pair of exoplanets have been confirmed in orbit around the brighter star. This system is located at a distance of 161 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 25.2 K.[5] Although having an absolute magnitude of 4.47,[1] at that range the system is too faint to be visible with the naked eye, having an apparent visual magnitude of 8.01.[1]

The brighter primary member, designated component A, has a spectrum that presents as a G-type main-sequence star,[4] a yellow dwarf, with a stellar classification of G5V.[3] The star is about 4 billion years old and is spinning with a projected rotational velocity of 1.2 km/s.[7] Based on the abundance of iron, a measure of the star's metallicity, it is twice as enriched with heavy elements than the Sun. The star exhibits a magnetic activity cycle with a period around 6 years.[9] It has 1.1 times the mass of the Sun and 1.15 times the Sun's radius. HD 107148 is radiating 1.34 times the luminosity of the Sun from its photosphere at an effective temperature of 5,789 K.[6]

In 2012, a comoving white dwarf stellar companion HD 107148 B was detected[10] at projected separation of 1,790 AU, and was confirmed in 2014. It is a 0.6 M☉ remnant core of the former 1.8±0.2 M☉ star with a cooling age of 2.1±0.3 Gyr. This was formerly the primary component of this system before it ejected much of its mass.[4]

  1. ^ a b c d e f 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 Cite error: The named reference Houk_Swift_1999 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Mugrauer2014 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Bonfanti_et_al_2015 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Soto2018 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 Rosenthal2021 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Tokovinin_Lépine_2012 was invoked but never defined (see the help page).