What do we call the point in the orbit of a planet at which the planet is nearest to the Sun?
Planet Nine close as to the Sun at its perihelion and take it as far away as at its aphelion. The aphelion, or farthest point from the Sun, would be in the general direction of the constellation of Taurus, whereas the perihelion, the nearest point to the Sun, would be in the general direction of the southerly areas of Serpens (Caput), Ophiuchus, and Libra. Brown thinks that if Planet Nine is confirmed to exist, a probe could fly by it in as little as 20 years with a powered slingshot around the Sun. The planet is estimated to have 10 times the
Planet Nine would affect the orbit of Saturn, not "Cassini" ... This could produce a signature in the measurements of "Cassini" while in orbit about Saturn if the planet was close enough to the Sun. But we do not see any unexplained signature above the level of the measurement noise in "Cassini" data taken from 2004 to 2016." Observations of Saturn's orbit neither prove nor disprove that Planet Nine exists. Rather, they suggest that Planet Nine could not be in certain sections of its proposed orbit because its gravity would cause a noticeable effect on Saturn's position, inconsistent with actual observations. An