HD 181433

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, 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. The system shows a high proper motion, traversing the celestial sphere at an angular rate of 0.340 arcsec yr−1.

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

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. These are inconsistent with the fact that its luminosity is only 0.34 times that of the Sun. Its entry in the Hipparcos catalogue lists a spectral type of K5V, 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. It is smaller than the Sun, with 84% of the Sun's mass and 80% of the radius. This star is spinning with a projected rotational velocity of 1.6 km/s. The effective temperature of the stellar atmosphere is 4,909 K.

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