This object is an ordinaryG-type main-sequence star with astellar classification of G2Va,[3] and it is considered asolar twin.[5] The mass, size, and luminosity of the star are slightly higher than for the Sun, and it has a near solarmetallicity – what astronomers term the abundance of elements with higheratomic numbers than helium. The star is around three billion years old and is spinning with a 20-day period.[6] It has a 5.14[9]-yearmagnetic activity cycle that has a loweramplitude than on the Sun.[7]
HD 45184 has a planet around 12 times as massive as Earth that takes 5.88 days to complete an orbit around its host star. This planet was detected using theradial velocity method.[10] It was later confirmed with Spitzer, whereupon a second candidate planet of similar mass was discovered orbiting with a 13.1 day period. The star was observed by Spitzer for a transit of the inner planet, but no event was detected.[11] Both Neptune-like planets have near circular orbits close to the host star.[7]
Aninfrared excess has been detected using theMultiband Imaging Photometer for Spitzer at a wavelength of70 μm, making this adebris disk candidate.[12] Based upon blackbody models, it is orbiting1.0 AU from the host star with a mean temperature of 280 K. There may be an additional, 60 K debris disk orbiting at a distance of22.89 AU.[13]
^Mayor, M.; et al. (2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets".arXiv:1109.2497.Bibcode:2011arXiv1109.2497M.{{cite journal}}:Cite journal requires|journal= (help)
