The star Betelgeuse has coordinates RA= 05h 55m and dec= +07° 24′. You observe Betelgeuse rising on your eastern horizon. What is the hour angle of Betelgeuse? a. 05h 55m b. 00h 00m c. 06h 00m d. 12h 55m e. 18h 00m

The star Betelgeuse has coordinates RA= 05h 55m and dec= +07° 24′. You observe Betelgeuse rising on your eastern horizon. What is the hour angle of Betelgeuse? a. 05h 55m b. 00h 00m c. 06h 00m d. 12h 55m e. 18h 00m

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Question

The star Betelgeuse has coordinates RA= 05^h 55^mand dec= +07° 24′. You observe Betelgeuse rising on your eastern horizon.

What is the hour angle of Betelgeuse?

	a.	05^h 55^m
	b.	00^h 00^m
	c.	06^h 00^m
	d.	12^h 55^m
	e.	18^h 00^m

Expert Solution

Step 1

The Local Sidereal Time is equal to the right ascension of objects on the
meridian.

The difference between local mean sidereal time and the actual right ascension of a star is called the hour angle
HA = LMST - αstar

Given , RA. i.e αstar =05^h 55^m

^{Now LMST is equal to right ascension of star Betelgeuse ,}

^{Therefore, for given problem}

^{LMST =αstar}

^{Hence the hour angle of star Betelgeuse is}

^{HA = LMST - αstar}

^{HA = αstar - αstar =} 00^h00^m

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