The star Sirius has an apparent magnitude ?V = −1.46 and a parallax ? = 0.37921”.(a)...
The star Sirius has an apparent magnitude ?V = −1.46 and a parallax ? = 0.37921”.(a) Calculate its distance and absolute magnitude. (b) What would Sirius’ parallax be if it were measured from an observatory on Neptune’s moon Triton as Neptune orbited theSun?
Homework Answers
Answer:
b) Neptune orbits the Sun at a distance of 30 AU.
And the base of the parallax triangle is 30 times as large as that from the Earth.
Hence, the parallax angle is also 30 times as large.
Spica's parallax from Earth is
12.44 x 10^-3 arcsec,
corresponding to a distance is about 80 pc.
Thus
From Triton the parallax is
= 30x12.44 x 10^-3
= 0.3732 arcsec
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