HD 45364

Coordinates: Sky map 06h 25m 38s, −31° 28′ 51″
Source: Wikipedia, the free encyclopedia.
HD 45364
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension 06h 25m 38.47443s[1]
Declination −31° 28′ 51.4285″[1]
Apparent magnitude (V) 8.08[2]
Characteristics
Spectral type G8V[3]
B−V color index 0.719±0.015[2]
V−R color index 0.01
Distance
112.2 ± 0.1 ly
(34.39 ± 0.04 pc)
Absolute magnitude (MV)+5.51[2]
Details
Gyr
HIP 30579, SAO 196806[6]
Database references
Exoplanet Archive
data

HD 45364 is a

light years based on parallax.[1] It is drifting further away from the Sun with a radial velocity of +16.4 km/s,[1] having come within 49 light-years some 1.5 million years ago.[2]

This object is an ordinary

extrasolar planets (or exoplanets) orbiting around it.[7]

Planetary system

HD 45364 is one of only a relative few systems that have had more than one

mean motion resonance,[7]
which means the inner planet is completing three orbits for every two orbits of the outer planet.

It was difficult to explain how such resonant configuration of planetary orbits could evolve,[8] mainly due to too high (4-5 times) orbital eccentrities, although planetary system formation models involving hydrodynamic effects were proposed.[9]

Hydrodynamic formation scenario of HD45364
Hydrodynamic formation scenario of HD45364

As in 2022, refined radial-velocity data shows the planetary orbits are more circular and widely spaced, therefore planets are slightly out of mean motion resonance state.[10]

The HD 45364 planetary system[10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b
 		≥0.1893+0.0062
−0.006 MJ 		0.6793+0.0016
−0.0015 		225.79+0.81
−0.76 		0.067±0.016 — —
c
 		≥0.5490+0.0075
−0.0074 MJ 		0.9020±0.0010 345.43+0.54
−0.57 		0.019+0.011
−0.010 		— —

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    S2CID 119257644
    .
  3. ^
    S2CID 119476992
    .
  4. S2CID 54555839
    .
  5. ^
    S2CID 119107228
    . A76.
  6. ^ "HD 45364". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-19.
  7. ^
    S2CID 119235349
    .
  8. S2CID 118459467. (web preprint
    )
  9. S2CID 51897058
    .
  10. ^
    S2CID 251979687


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