Stars, Magnitudes, and Filters
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1
What are photons?
Photons are light packets carrying energy.
2
Blue light _____ more energy compared to red ones.
carries
3
What is one of the brightest stars in our galaxy?
Eta Carinae.
4
Lumonsity describes…
The total power of the star.
5
What is flux?
The number of photons passing through a surface a second.
6
How is flux measured?
Based on how far the star is.
7
What can impact how photons arrive at your telescope?
Dectectors, atmospheric transparency, telescope imperfections, and local sources of stray light.
8
How can you estimate the brightness of stars?
By comparing them to one another.
9
What did Hipparchus do in 129 B.C.?
Produced the first known catalog of stars.
10
What did Ptolemy do?
Created a 6 catagory catalog measuring the brightness of stars (Alamogest)
11
What catalog is most compariable to the one we use today?
Ptolemy’s Alamagest catalog
12
Who updated the Alamagest catalog?
Al-Battani (500 stars in 899 A.D.) and Al-Sufi (1151 stars in 964 A.D.)
13
Who was the first person to introduce trig into the catalog calculations?
Al-Battani
14
What did Tycho Brahes do in 1603?
Catalogged 777 stars in the Uranometria.
15
What did Galileo do?
Discovered that magnitudes can describe the brightnesses of stars.
16
What did Edmond Halley do?
Produced a 341 star catalog.
17
What did William Herschel notice?
That measurements of stars were inconsistent with one another.
18
What can photographic plates do?
Photograph nebulas.
19
How many stars are catalogged today?
300 million stars as of 2006.
20
What can telescope filters allow you to see?
Certain colors, wavelengths, and energies of light.
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