HD 181433

HD 181433
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pavo[1]
Right ascension 19h 25m 09.567s[2]
Declination −66° 28′ 07.68″[2]
Apparent magnitude (V) 8.40[1]
Characteristics
Spectral type K3III-IV[3]
B−V color index 1.006±0.045[1]
Astrometry
Radial velocity (Rv)+40.144±0.0003[4] km/s
Proper motion (μ) RA: –230.723 mas/yr[2]
Dec.: 235.806 mas/yr[2]
Parallax (π)37.0511 ± 0.0211 mas[2]
Distance88.03 ± 0.05 ly
(26.99 ± 0.02 pc)
Absolute magnitude (MV)6.26[1]
Details
Mass0.84±0.02[5] M☉
Radius0.80±0.02[5] R☉
Luminosity0.34±0.01[5] L☉
Surface gravity (log g)4.55±0.02[5] cgs
Temperature4,909±20[5] K
Metallicity [Fe/H]0.33[6] dex
Rotational velocity (v sin i)1.588±0.072[7] km/s
Age6.7±1.8 Gyr[6]
7.4±3.4[5] Gyr
Other designations
CD−66° 2307, GJ 756.1, HD 181433, HIP 95467, SAO 254563, PPM 363979, LTT 7669[8]
Database references
SIMBADdata
Exoplanet Archivedata

HD 181433 is a star with a system of orbiting exoplanets located in the southern constellation of Pavo (the Peacock). With an apparent visual magnitude of 8.40,[1] it is too faint to be visible to the naked eye. It lies at a distance of 88 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +40 km/s.[4] The system shows a high proper motion, traversing the celestial sphere at an angular rate of 0.340 arcsec yr−1.[9]

This K-type star has a stellar classification of K3III-IV, which presents it as an evolved star with mixed traits of a red giant and a subgiant. G. Campanella and associates list a class of K3IV.[10] These are inconsistent with the fact that its luminosity is only 0.34 times that of the Sun.[11][5] Its entry in the Hipparcos catalogue lists a spectral type of K5V,[12] classifying it as an ordinary K-type main-sequence star, an orange dwarf.

HD 181433 is an older star with age estimates of around 7 billion years.[7][5] It is smaller than the Sun, with 84% of the Sun's mass and 80% of the radius.[5] This star is spinning with a projected rotational velocity of 1.6 km/s.[7] The effective temperature of the stellar atmosphere is 4,909 K.[5]

  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. ^ Cite error: The named reference Gray_et_al_2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  5. ^ a b c d e f g h i j Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference aaa535_A42 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Soto_Jenkins_2018 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 Luyten1995 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Campanella_et_al_2013 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference bouchy2009 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference esa97 was invoked but never defined (see the help page).