Local Sidereal Time of Observation.

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SUMMARY

The discussion centers on calculating the Local Sidereal Time (LST) for observing the K2 III star N'3148°α Arietis from the Dominion Astrophysical Observatory (DAO) in Saanich, B.C. The astronomer begins the observing run 3 hours before the star crosses the meridian. Using the formula LST = HA + RA, where the hour angle (HA) is -3h, the correct LST at the start of the observing run is determined by adding the HA to the star's right ascension of 2h 07m 30s.

PREREQUISITES
  • Understanding of Local Sidereal Time (LST)
  • Familiarity with astronomical coordinates, specifically right ascension and declination
  • Basic knowledge of hour angle calculations
  • Experience with observational astronomy concepts
NEXT STEPS
  • Study the calculation of Local Sidereal Time in different geographical locations
  • Learn about the significance of hour angle in astronomical observations
  • Explore the equatorial coordinate system in detail
  • Investigate the effects of latitude on astronomical observations
USEFUL FOR

Astronomers, astrophysics students, and anyone involved in observational astronomy who seeks to understand the timing of celestial observations.

~Sam~
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1. An astronomer at the Dominion Astrophysical Observatory (DAO), located at latitude
48° 31' N in Saanich, near Victoria, B.C., is studying the K2 III star N'3148°α Arietis. The equatorial coordinates of α Arietis are right ascension=2h 07 m 30s and declination of 23°29'

If the astronomer starts an observing run 3 hours before α Arietis crosses the meridian, at what local sidereal time does the observing run start?


Homework Equations



LST=HA+RA


The Attempt at a Solution



I'm wondering if I just used the equation of if there is more comprehension involved. Would I take the hour angle to be -3h (since it east of the meridian) and add it to the right ascension of the star?
 
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Yep, that's about it. It's as simple as that. =)
 

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