Using a telescope and spectrometer on earth, you measure the 121.567 nm transition line of hydrogen gas on either side of the equator of jupiter, which has a diameter of 143 x10 km. on the left edge, you measure 121.164 nm, while on the right edge you measure 121.776 nm. a) is jupiter approaching or receding from the earth? at what speed (line-of-sight speed)? b) what is the rotation speed at jupiter's equator? what is the rotation period of jupiter in days?