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## AST 101 (8.25.16)

by: Cierrah Rasmussen

5

0

3

# AST 101 (8.25.16) AST 101

Cierrah Rasmussen
Minnesota State University, Mankato

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Magnitude scale
COURSE
Introductory Astronomy
PROF.
Steve Kipp
TYPE
Class Notes
PAGES
3
WORDS
KARMA
25 ?

## Popular in Department

This 3 page Class Notes was uploaded by Cierrah Rasmussen on Tuesday September 20, 2016. The Class Notes belongs to AST 101 at Minnesota State University - Mankato taught by Steve Kipp in Fall 2016. Since its upload, it has received 5 views.

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Date Created: 09/20/16
Stopped naming stars and started naming them my numbers. ------------------------------------------------------------------------------- Magnitude Scale: Measures the brightness of stars. Brightest stars --> 1 mag. Look ½ as bright --> 2 ndmag. … Faintest naked-eye stars --> 6 mag. Quirks:  The scale runs backwards. (Bigger # = fainter star)  The scale is not linear. (A difference of 5 mag. Corresponds to a factor of 100 in brightness) , m = magnitude m(sun) = -26.5 , m(faint) = +30 ------------------------------------------------------------------------------------ Celestial Sphere: Cant ever see southern circumpolar cap. Always can see northern circumpolar cap. N-S: (earth) --> Latitude same numbers (°) on earth and the sky just different names (sky) --> declination E-W: (earth) --> Longitude same numbers (°) on earth and the sky just different names (sky) --> Right Ascension Measured in "hour angles" 360°/24hr 1hr = 15° (hour angles) ------------------------------------------------------------------------------------------------ 18^h24^m12^s + 37°08'42'' ( like latitude and longitude but for the sky) Earth rotates its own axes, revolves around the sun. ------------------------------------------------------------------------------------------------ Solar Day: Interval between meridian crossings of a star. 4 Minutes shorter than a solar day.

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