Astronomy C

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Osennecho
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Re: Astronomy C

Post by Osennecho » March 8th, 2012, 5:17 pm

AlphaTauri wrote:I seem to have lost or otherwise neglected to save the original page of links (oops), but as I recall, most of the links were useless and/or broken anyways. Here's some of the better courses I pulled off of that site: Ohio State, University of Tennessee, and UC San Diego.
Osennecho wrote:I need new information to read... The same repetitive material in all the textbooks I have isn't useful enough for the PA regional/state astro tests (By far hardest tests I have ever taken in science olympiad all invitationals included).
I'm with ya on that, though it's worse for you since the guy who writes for States also writes the SE test. Last year at States, my partner and I were completely blown away by how tough the test was - we couldn't even answer the first question! (But at least now it's forever ingrained in my mind that the "MACS" in MACSJ0717.5+3745 stands for MAssive Cluster Survey). Heh, scores were funny though - 1st and 2nd place were in the 70s or low 80s on a 100-point test, 3rd place...was around 25...and then the 33 remaining teams must've scored within a 24-point spread...
Are you serious about that point spread? Or sarcasm... It seriously could be either... If true I feel a bit better about this year... Long story behind why so I won't bother to type it :roll: ...
2012 Events: (Regionals, States, Nationals); N/A=conflict
Astronomy (6th, 7th, 16th)
Dynamic Planet (N/A, N/A, 11th)
Optics (2nd, 3rd, 5th)
Remote Sensing (N/A, 5th, 47th)

Team Overall (3rd, 2nd, 14th)
It's been a life changing 6 year experience.

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Re: Astronomy C

Post by HannahD413 » March 10th, 2012, 12:39 pm

Can someone help double check the answer to this question?
19. Supernova 2011fe was one of the best this year. What is the distance to it in Megaparsecs? Its light curve is shown below
a) 7.1 Mpc
b) 83 Mpc
c) 692 Mpc
d) 46 Mpc
e) .52 Mpc
The light curve is shown to peak at an apparent magnitude of about 10. The answer key says b, and the note on the key says:
Peak apparent magnitude = 10. Absolute magnitude of type Ia supernovae=-19.6. Use distance modulus: Dist(pc)=10*10^(m-M/5)=10*10^((10.19.6)/5)
However, if the distance modulus equation that I have seen everywhere else, m-M=-5+5logd, is used, it doesn't work. Am I doing something stupid wrong?

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Re: Astronomy C

Post by manutd94 » March 10th, 2012, 12:46 pm

Your formula m-M = -5 + 5log(d) should work. I believe the key might be off by one magnitude (83 is what they have as opposed to 8.3 Mpc).
2010 States: 1st Astronomy, 1st Remote Sensing
2010 Nationals: 3rd Astronomy, 5th Remote Sensing
2011 States: 1st Astronomy, 2nd Wind Power, 5th Fossils
2011 Nationals: 1st Astronomy, 6th Wind Power
2012 States: 1st Astronomy, 1st Remote Sensing, 3rd Chemistry Lab

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Re: Astronomy C

Post by FullMetalMaple » March 10th, 2012, 1:40 pm

When I worked the problem, I got 83 Mpc... I used the rearranged form of the distance modulus, though (d = 10^(m - M + 5)/5).

EDIT: Never mind. I put that in wrong.
Last edited by FullMetalMaple on March 10th, 2012, 1:58 pm, edited 1 time in total.

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Re: Astronomy C

Post by pjgscioisamazing » March 10th, 2012, 1:47 pm

FullMetalMaple wrote:When I worked the problem, I got 83 Mpc... I used the rearranged form of the distance modulus, though (d = 10^(m - M - 5)/5).
The rearranged distance modulus equation is d = 10^((m-M+5)/5)
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Re: Astronomy C

Post by FullMetalMaple » March 10th, 2012, 1:57 pm

pjgscioisamazing wrote:
FullMetalMaple wrote:When I worked the problem, I got 83 Mpc... I used the rearranged form of the distance modulus, though (d = 10^(m - M - 5)/5).
The rearranged distance modulus equation is d = 10^((m-M+5)/5)
Yeah... that was a dumb mistake. Thanks for catching it.

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Re: Astronomy C

Post by HannahD413 » March 10th, 2012, 2:19 pm

If you use 19.6 as the magnitude (rather than 19.3, which is what we were using during the competition), I can see how you get 8.3 Mpc, but not 83. -5+5log(83*10^6)=35.6 which does not equal 10+19.6=29.6, -5+5log(8.3*10^6) does however.

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Re: Astronomy C

Post by pihi » March 12th, 2012, 7:24 pm

In the rules document it says that you can bring laptops. Does that mean each team member gets to bring a laptop or is it just one per team? At regionals, the judge was pretty strict and said that each team was only allowed one laptop.
2012: Astronomy, Forestry
CLIO: Astronomy - 4th, Forestry - 16
Regionals: Astronomy - 3rd, Forestry - 4th Team - 2nd
States: Astronomy - 3rd, Forestry...............18th :( Team - 13th (Best new school)

Only 365 more days til states!

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Re: Astronomy C

Post by AlphaTauri » March 12th, 2012, 7:31 pm

You can bring a laptop or a three-ring binder per person. So if you really wanted to, yes, you could bring two laptops...although it'd be kind of redundant, since with the amount of storage most laptops have (or with the addition of a flash drive or external HD), you could just put all the info on one laptop and have a binder for quick info.

For future reference, if you get a judge like that in the future, you are allowed to politely point out - preferably with rules in hand - that they're not running the event right. Typically it works best if you're part of the first group to go for the event, since they're less likely to change the way they're running the event if people have already competed with the handicap.
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Re: Astronomy C

Post by pihi » March 12th, 2012, 7:48 pm

AlphaTauri wrote:You can bring a laptop or a three-ring binder per person. So if you really wanted to, yes, you could bring two laptops...although it'd be kind of redundant, since with the amount of storage most laptops have (or with the addition of a flash drive or external HD), you could just put all the info on one laptop and have a binder for quick info.

For future reference, if you get a judge like that in the future, you are allowed to politely point out - preferably with rules in hand - that they're not running the event right. Typically it works best if you're part of the first group to go for the event, since they're less likely to change the way they're running the event if people have already competed with the handicap.
Ok thank you! And the reason we wanted two laptops was because the test was two separate sheets and we thought it would be quicker with two laptops so each partner could do half of the test
2012: Astronomy, Forestry
CLIO: Astronomy - 4th, Forestry - 16
Regionals: Astronomy - 3rd, Forestry - 4th Team - 2nd
States: Astronomy - 3rd, Forestry...............18th :( Team - 13th (Best new school)

Only 365 more days til states!

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