lecture2

1 pc 309 10 km 326ly 13 unitsofdistanceinastronomy

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Unformatted text preview: l angle approximation becomes D= αd 206, 265 since 1(rad ) = 206, 265(arc sec) Units of Distance in Astronomy = × 15 Units of Distance in Astronomy = × 15 = × 15 = × 12 × 3 Units of Distance in Astronomy It takes light about 500 seconds to travel from the Sun to the Earth Units of Distance in Astronomy It takes light about 500 seconds to travel from the Sun to the Earth = Units of Distance in Astronomy It takes light about 500 seconds to travel from the Sun to the Earth = =× = = × 8 × × 11 8 Units of Distance in Astronomy It takes light about 500 seconds to travel from the Sun to the Earth = =× = = × 8 × × 11 8 This distance is called an Astronomical Unit (AU) = × 8 Units of Distance in Astronomy A parsec is the distance at which on astronomical unit subtends one arcsecond. 1( pc) = 3.09 × 10 (km) = 3.26(ly ) 13 Units of Distance in Astronomy A parsec is the distance at which on astronomical unit subtends one arcsecond. 1( pc) = 3.09 × 10 (km) = 3.26(ly ) 13 A kiloparsec is a thousandparsecs and a megaparsec is a million parsecs. 1(kpc) = 103 ( pc) = 3.26 × 103 (ly ) 1( Mpc) = 106 ( pc) =...
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