Look up the seven Big Dipper stars on the SIMBAD astronomical database (http: //

Question

Look up the seven Big Dipper stars on the SIMBAD astronomical database (http: //simbad.u-strasbR.fr/simbad/sim-fid). You can look them up by their common names (Alioth, Alkaid, Dubhe, Megrez, Merak, Mizar, and Phecda). As seen in class, SIMBAD lists a lot of information for stars including their coordinates, alternate names, and other measures we will discuss later. For now, use SIMBAD to get the name of the stars based on the constellation (Greek letter abbreviation followed by constellation name, e.g., alf UMa), their coordinates (ICRS, J2000), and their HD number (the Henry-Draper catalog of bright stars). List them in a table with their common name, constellation-based name, HD number, RA and DEC). A. Which of these stars are circumpolar at Atlanta? Explain your reasoning. B. Which of these stars will get the highest in your sky at Atlanta? Why? C. At what time (LST) will this star get to its highest point in your sky? D. Where would you have to live on Earth (range of latitudes) to never be able to see any of the Big Dipper stars?

Explanation / Answer

A.Among the above stars MegrezUMA is the circumpolar at Atlanta because MegrezUMA is always above the horizon.

B.Dubhe and Merak are the stars found at the highest point because these two stars are the pointer star.

C.At spring and summer this star will found to its highest point.

Common name constellation name HD no RA DEC Aliath epsilonUMA 112185 12h 53m 1.63sec + 55°58' Alkaid etaUMA 120315 13h 47m 32.4sec +49°18'47.7602" Dubhe alphaUMA 95689 11h 03m 43.67152sec +61°45'03.7249" Megrez sigmaUMA 106591 12h 15m 25.56063sec +57°01'57.4156" Merak betaUMA 95418 11h 01m 50.47654sec +56°22'56.7339" Mizar zeta UMA 116842 13h 23m 55.5sec +54°55'31" Phecda gammaUMA 103287 11h 53m 49.84732sec +53°41'41.1350"

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