Sirius, how fast is Sirius

31) Star Sirius has an apparent magnitude of -1.47 and an absolute magnitude of 1.41. Estimate the distance to Sirius.

The right ascension and declination of the seven stars of the Big Dipper are given below: Star Right Ascension Declination Alkaid 13h48m +49° 19' Mizar 13h24m +54°56' Alioth 12h54m +55°58' 12h15m +57°02' 11h54m +53°42' Merak 11h02m +56°23' Dubhe 11h04m +61°45' (1) For what range of latitude are all the stars of the Big Dipper circumpolar? Megrez Phecda

Star 1 and star 2 have the same V-magnitude, V = 7.5. However, they have different B-magnitudes, B1 = 7.2 and B2 = 8.5. What are the (B − V) colors of the two stars?

Earth tugs the Sun around as it orbits, but it affects the radial velocity of the sun by only 0.09m/s. How large a shift in wavelength does this cause in the Sun's spectrum at 575 nm?

If the Sun is located at point F1, what is located at F2? a 12 b C F1 F2 Earth A star Nothing Sun Semi-major axis