U
u_chen
Guest
1.calculate the α and δ for a star with coordinates z = 49˚15’10” and azimuth 298˚28’50”,observed from Moscow at the sidereal time 11h 11m 36s
2.the upper culmination of Capella ( α = 5 h 10 m ) is observed at Orla, at 4h 48m according to a clock set to local siderial time at Kiev. What is the difference latitude of these two places?
3.what are the days in the Gregorian calendar corresponding to the 15th February 1900 in the Julian calendar?
4.calculate from the following data, the age of binary star which the components have equal masses and are both known to have consumed 20% of their initial hydrogen at constant luminosity
period of orbit : 20 years
angular separation of the two stars : 0”.75
plane of orbit is at right angles to the line of sight
Annual parallax : 0”.1
Apparent bolometric magnitude of each component : +0.2
Sun’s absolute bolometric magnitude : +4.75
Sun’s Luminosity : 4 x 10^26 J/s
Sun’s mass : 2 x 10^30 kg
Energy produced in the conversion of hydrogen to helium : 6.6 x 10^14 J/kg
2.the upper culmination of Capella ( α = 5 h 10 m ) is observed at Orla, at 4h 48m according to a clock set to local siderial time at Kiev. What is the difference latitude of these two places?
3.what are the days in the Gregorian calendar corresponding to the 15th February 1900 in the Julian calendar?
4.calculate from the following data, the age of binary star which the components have equal masses and are both known to have consumed 20% of their initial hydrogen at constant luminosity
period of orbit : 20 years
angular separation of the two stars : 0”.75
plane of orbit is at right angles to the line of sight
Annual parallax : 0”.1
Apparent bolometric magnitude of each component : +0.2
Sun’s absolute bolometric magnitude : +4.75
Sun’s Luminosity : 4 x 10^26 J/s
Sun’s mass : 2 x 10^30 kg
Energy produced in the conversion of hydrogen to helium : 6.6 x 10^14 J/kg