The velocity of the spacecraft with respect to the Sun is
the velocity of the comet in the reference system of the spacecraft is
So, the velocity of the comet in the reference system of the Sun will be
And the negative sign tells us that the comet is directed toward the Sun.
the velocity of the comet in the reference system of the spacecraft is
So, the velocity of the comet in the reference system of the Sun will be
And the negative sign tells us that the comet is directed toward the Sun.