The brighter primary member, designated component A, has aspectrum that presents as aG-type main-sequence star,[4] a yellow dwarf, with astellar classification of G5V.[3] The star is about 4 billion years old and is spinning with aprojected rotational velocity of 1.2 km/s.[7] Based on the abundance of iron, a measure of the star'smetallicity, it is twice as enriched with heavy elements than the Sun. The star exhibits amagnetic activity cycle with a period around 6 years.[9] It has 1.1 times the mass of the Sun and 1.15 times the Sun's radius. HD 107148 is radiating 1.34 times the luminosity of the Sun from itsphotosphere at an effective temperature of 5,789 K.[6]
In 2012, a comovingwhite dwarf stellar companionHD 107148 B was detected[10] at projected separation of 1,790AU, and was confirmed in 2014. It is a 0.6M☉ remnant core of the former 1.8±0.2M☉ star with a cooling age of2.1±0.3 Gyr. This was formerly the primary component of this system before it ejected much of its mass.[4]
In 2006, a discovery of Saturn-mass planet was announced.[11] Another Neptune-sized planet was discovered in 2021, together with significantly refined orbit ofHD 107148 b.[9]
HD 107148 should not be confused withHD 108147 located inCrux constellation, which also has anextrasolar planet discovered in 2000.
^abHouk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars",Michigan Spectral Survey,5,Bibcode:1999MSS...C05....0H.
