HD 139357

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HD 139357
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Draco
Right ascension 15h 35m 16.20s[1]
Declination +53° 55′ 19.7″[1]
Apparent magnitude (V) 5.977
Characteristics
Spectral type K4III
B−V color index 1.191
Astrometry
Radial velocity (Rv) –8.75 ± 0.39 km/s
Proper motion (μ) RA: -18.32 ± 0.30[1] mas/yr
Dec.: 1.64 ± 0.33[1] mas/yr
Parallax (π) 8.47 ± 0.30[1] mas
Distance 390 ± 10 ly
(118 ± 4 pc)
Absolute magnitude (MV) 0.557
Details
Mass 1.35 ± 0.24 M
Radius 11.47 ± 0.75 R
Luminosity 57.4 L
Surface gravity (log g) 1.51 cgs
Temperature 4700 ± 70 K
Metallicity –0.13 ± 0.05
Age 3.07 ± 1.47 Gyr
Other designations
BD+54° 1756, GC 20977, GCRV 9003, HIP 76311, HR 5811, PPM 35043, SAO 29583
Database references
SIMBAD data
Exoplanet Archive data
Extrasolar Planets
Encyclopaedia
data

HD 139357 is a 6th magnitude K-type giant star located approximately 390 light years from Earth, visible in the constellation Draco. Its mass is four thirds that of our Sun but its radius is 11.47 times larger. However, despite being a giant star, it is only 3.07 billion years old, which is younger than our Sun.

It hosts a planet discovered in 2009.

The HD 139357 planetary system[2]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥9.76 ± 2.15 MJ 2.36 ± 0.02 1125.7 ± 9 0.10 ± 0.02

See also[edit]

References[edit]

Coordinates: Sky map 15h 35m 16.1992s, +53° 55′ 19.717″