HD 45364

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HD 45364
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension 06h 25m 38.48s[1]
Declination −31° 28′ 51.4″[1]
Apparent magnitude (V) 8.07
Spectral type G8V
B−V color index 0.719
V−R color index 0.01
Radial velocity (Rv)15.9 km/s
Proper motion (μ) RA: 53.22 ± 0.48 [1] mas/yr
Dec.: −13.20 ± 0.77 [1] mas/yr
Parallax (π)30.59 ± 0.68[1] mas
Distance107 ± 2 ly
(32.7 ± 0.7 pc)
Absolute magnitude (MV)+5.50
Mass0.88 ± 0.02[2] M
Radius0.82 ± 0.01[2] R
Luminosity0.562 ± 0.004[2] L
Surface gravity (log g)4.55 ± 0.03[2] cgs
Temperature5540 ± 31[2] K
Age3.4 ± 2.7[2] Gyr
Other designations
CD−31° 3286, HD 30579, SAO 196806
Database references
Exoplanet Archivedata
Extrasolar Planets

HD 45364 is a star approximately 107 light years away from Earth in the constellation of Canis Major. As of August 2008 there are two confirmed extrasolar planets (or exoplanets) orbiting around it.[3]

Planetary system[edit]

HD 45364 is one of only a relative few systems that have had more than one exoplanet discovered in its orbit. The two planets, HD 45364 b and HD 45364 c respectively, were both discovered in August 2008.

The HD 45364 planetary system[3]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b ≥0.1872 MJ 0.6813 226.93 ± 0.37 0.1684 ± 0.190
c ≥0.6579 MJ 0.8972 342.85 ± 0.28 0.0974 ± 0.012

Formation scenario[edit]

Hydrodynamic formation scenario of HD45364
Hydrodynamic formation scenario of HD45364

A detailed analysis of the formation scenario revealed that the previously reported orbital configuration might not be correct.[4] The eccentricities are a factor of 4-5 too large to be consistent with standard planet formation theories.[1] This is the first time that planet formation theory was able to predict new orbital parameters of a planetary system. There are other proposed scenario, in which remains the resonant configuration of the planetary system [5]


Coordinates: Sky map 06h 25m 38s, −31° 28′ 51″