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local standard of rest
In astronomy, the local standard of rest or LSR follows the mean motion of material in the Milky Way in the neighborhood of the Sun. The path of this material is not precisely circular. The Sun follows the solar circle (eccentricity ''e'' < 0.1 ) at a speed of about 255 km/s in a clockwise direction when viewed from the galactic north pole at a radius of ≈ 8.34 kpc〔〕 about the center of the galaxy near Sgr A
*, and has only a slight motion, towards the Solar apex, relative to the LSR.〔The Sun's peculiar motion relative to the LSR is 13.4 km/s. See, for example, or 〕
The LSR velocity is anywhere from 202–241 km/s. In 2014, very-long-baseline interferometry observations of maser emission in high mass star forming regions placed tight constraints on combinations of kinematic parameters such as the circular orbit speed of the Sun (Θ0 + V(unicode:☉) = 255.2 ± 5.1 km/s).〔 There is significant correlation between the circular motion of the solar circle, the solar peculiar motion, and the predicted counterrotation of star-forming regions.〔〕 Additionally, ''local'' estimates of the velocity of the LSR based on stars in the vicinity of the Sun〔〕 may potentially yield different results than ''global'' estimates derived from motions relative to the Galactic center.〔〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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