HR 7703 (Gliese 783,279 G. Sagittarii) is abinary star system in theconstellation ofSagittarius. The brighter component has anapparent visual magnitude of 5.31,[2] which means it isvisible from suburban skies at night. The two stars are separated by an angle of 7.10″, which corresponds to an estimatedsemimajor axis of 56.30 AU for their orbit.[12]
Based upon an annualparallax shift of 0.16625 arc seconds as measured by theHipparcos satellite, this system is 19.62light-years (6.015parsecs) fromEarth. It is approaching theSolar System at avelocity of approximately 129 kilometers per second.[16] At this rate, it will make its closest approach in 41,100 years when it comes to within 6.7 light-years (2.05 parsecs) of the Sun.[17]
This star system has been examined for anexcess of radiation in theinfrared. The presence of an infrared excess can be taken as an indication of adebris disk orbiting the star. However, no such excess was discovered around HR 7703.[18]Radial velocity data collected over a period of 12 years was examined for signs of periodicity caused by a planet orbiting at a distance of 3–6 AU, but none was detected.[19] A slight linear trend in the radial velocities of the primary is probably due to the companion star.[20]
