How would the stellar parallaxes observed from Pluto compare with those observed from Earth?

Question

Alexander Acosta · Accepted Answer

Stellar parallax from Pluto would have a much better resolution.

On Earth, stellar parallax is measured using an initial measurement and a follow-up measurement six months later when the Earth is at the other side of its orbit, yielding a baseline of two astronomical units. This is the smallest angle shift that can be measured between the two measurements, and it indicates the maximum distance that an object can be measured using parallax. With a baseline of 79 astronomical units (AU), Pluto, on the other hand, is 40 times further away from Earth than can be determined using Earth's parallax. Pluto's orbital period is 248 years, so the problem with measuring parallax from Pluto is that you would have to wait 124 years between measurements.

Ian Aitchison · Answer

undefined The stellar parallaxes observed from Pluto would be smaller than those observed from Earth due to the larger distance between Pluto and the stars compared to Earth's distance from the stars.