HD 154857

HD 154857
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 11m 15.72180s[1]
Declination −56° 40′ 50.8706″[1]
Apparent magnitude (V) 7.25[2]
Characteristics
Spectral type G5IV-V[3]
B−V color index 0.699±0.001[2]
Variable type Constant[4]
Astrometry
Radial velocity (Rv)+28.06±0.15[1] km/s
Proper motion (μ) RA: 87.585[1] mas/yr
Dec.: −55.891[1] mas/yr
Parallax (π)15.7321 ± 0.0385 mas[1]
Distance207.3 ± 0.5 ly
(63.6 ± 0.2 pc)
Absolute magnitude (MV)3.07[3]
Details
Mass1.718+0.03
−0.022[5] M☉
Radius2.1±0.1[4] R☉
Luminosity4.4±0.3[4] L☉
Surface gravity (log g)3.83±0.03[4] cgs
Temperature5,740±46[4] K
Metallicity [Fe/H]−0.26±0.01[6] dex
Rotational velocity (v sin i)1.44±0.50[7] km/s
Age5.8±0.5[4] Gyr
Other designations
CD−56° 6717, CPD−56° 8059, GC 23146, HD 154857, HIP 84069, SAO 244491, PPM 345752, TYC 8735-1682-1, GSC 08735-01682[8]
Database references
SIMBADdata

HD 154857 is a star with two exoplanetary companions in the southern constellation of Ara. It is too dim to be visible with the naked eye having an apparent visual magnitude of 7.25.[2] The star is located at a distance of 207 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +28 km/s.[1]

This is a G-type star with a stellar classification of G5IV-V.[3] The absolute magnitude of this star is two magnitudes above the main sequence, which suggests that the star is evolving toward the subgiant stage.[3] It is a metal-poor thin disk star[9] approximately six billion years old and is chromopherically quiet although not in a Maunder Minimum state.[4] The star is larger, more massive, and more luminous than the Sun. It is spinning with a projected rotational velocity of 1.4 km/s.[7]

  1. ^ a b c d e f g Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference McCarthy2004 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Wittenmyer was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Sousa_et_al_2018 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Butler_et_al_2006 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 Gonzalez2009 was invoked but never defined (see the help page).