BD-11 4672

BD-11 4672
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Scutum[1]
Right ascension 18h 33m 28.832s[2]
Declination −11° 38′ 09.72″[2]
Apparent magnitude (V) 9.99±0.05[3]
Characteristics
Evolutionary stage main sequence[3]
Spectral type K7 V[4][3]
Apparent magnitude (B) 11.21±0.10[3]
Apparent magnitude (J) 7.651±0.023[1]
B−V color index 1.263±0.009[1]
Astrometry
Radial velocity (Rv)−87.515±0.0011[5] km/s
Proper motion (μ) RA: −288.440 mas/yr[2]
Dec.: −235.615 mas/yr[2]
Parallax (π)36.7534 ± 0.0157 mas[2]
Distance88.74 ± 0.04 ly
(27.21 ± 0.01 pc)
Details
Mass0.651+0.031
−0.029[3] M☉
Radius0.639+0.020
−0.022[3] R☉
Luminosity0.157+0.019
−0.017[3] L☉
Surface gravity (log g)4.642+0.027
−0.025[3] cgs
Temperature4,550±110[3] K
Metallicity [Fe/H]−0.48±0.07[6] dex
Rotation~25 d[3]
Rotational velocity (v sin i)1.0±0.5[3] km/s
Age7.4+4.5
−4.9[3] Gyr
Other designations
BD−11 4672, Gaia DR2 4154598526336121600, GJ 717, HIP 90979, PPM 234703, Wolf 1462, TYC 5699-2129-1, GSC 05699-02129, 2MASS J18332885-1138097[7]
Database references
SIMBADdata

BD−11 4672 is a single star with a pair of orbiting exoplanets in the southern constellation of Scutum, the shield. The designation BD−11 4672 comes from the Bonner Durchmusterung star catalogue, which was published during the nineteenth century in Germany. With an apparent visual magnitude of 9.99,[3] the star is much too faint to be viewed with the naked eye. It is located at a distance of 89 light years from the Sun, as determined from parallax,[2] but is drifting closer with a radial velocity of −87.5 km/s.[5] This was recognised as a high proper motion star by German astronomer Max Wolf in 1924[8] and is traversing the celestial sphere at an angular rate of 0.401 arcsec yr−1.[9]

The spectrum of BD−11 4672 matches a K-type main-sequence star, an orange dwarf, with a stellar classification of K7 V.[4] Its age is not well constrained, but is probably older than the Sun. It is a metal-poor star, showing an iron abundance that is 35% of solar.[6] No significant flare activity was detected.[10] The star shows evidence of a Sun-like magnetic activity cycle with a period of 7–10 years.[3] It has 65% of the mass and 64% of the radius of the Sun. The star is radiating 16% of the luminosity of the Sun from its photosphere at an effective temperature of 4,550 K.[3]

  1. ^ a b c Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i j k l m n o Cite error: The named reference Barbato2020 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Moutou_et_al_2010 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 Andreasen2017 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference sb was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Wolf_Reinmuth_1925 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Luyten1995 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Lammer_et_al_2020 was invoked but never defined (see the help page).