- And Then How The Resulting Arcsec Is Converted From Arcsec S 1 To Arcsec Yr 1 Can Someone Break This Down Please 1 (35.63 KiB) Viewed 45 times
and then how the resulting arcsec is converted from arcsec s-1 to arcsec yr-1. Can someone break this down please?
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answerhappygod
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and then how the resulting arcsec is converted from arcsec s-1 to arcsec yr-1. Can someone break this down please?
and then how the resulting arcsec is converted from arcsec s-1 to arcsec yr-1. Can someone break this down please?
ΔΘ- Ar D hence AD 180.45 rad = 9.14 x 10-19 1.975 X 1020 9.14 x 10-19 206265 arcsec = 1.89 x 10-25 arcsec 2 Hence the rotation speed corresponds to 1.89 x 10-25 arcsecs 5.96 x 10-18 arcsec yr - 1 This rate is far too small to be detected directly. It would take the galaxy 1.68 x 1017 years to rotate through 1 arcsec! Exercise 4 NGC 2639 is an Sa galaxy with a measured maximum rotational velocity of 324 km s' and an apparent minnitude of 12 29 mag (after making corrections for extinction). Estimate its absolute magnitude
ΔΘ- Ar D hence AD 180.45 rad = 9.14 x 10-19 1.975 X 1020 9.14 x 10-19 206265 arcsec = 1.89 x 10-25 arcsec 2 Hence the rotation speed corresponds to 1.89 x 10-25 arcsecs 5.96 x 10-18 arcsec yr - 1 This rate is far too small to be detected directly. It would take the galaxy 1.68 x 1017 years to rotate through 1 arcsec! Exercise 4 NGC 2639 is an Sa galaxy with a measured maximum rotational velocity of 324 km s' and an apparent minnitude of 12 29 mag (after making corrections for extinction). Estimate its absolute magnitude
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