## Astronomy C

Ashernoel
Member
Posts: 345
Joined: January 27th, 2017, 1:31 pm
State: IL
Location: MA
Has thanked: 0
Been thanked: 2 times

### Re: Astronomy C

The Las Vegas Invitational (1/4/2020) Astronomy test and key are viewable here:

I’m excited to see many of you at MIT!
Last edited by Ashernoel on January 17th, 2020, 10:06 am, edited 1 time in total.
NT '19
Harvard '23

PM2017
Member
Posts: 522
Joined: January 20th, 2017, 5:02 pm
State: CA
Location: Enjoying College! :D
Has thanked: 22 times
Been thanked: 6 times

### Re: Astronomy C

Ashernoel wrote:
January 5th, 2020, 11:45 pm
The Las Vegas Invitational (1/4/2020) Astronomy test and key are viewable here:

I’m excited to see many of you at MIT!
Great (and extremely challenging) test from you, as always!
West High '19
UC Berkeley '23

Go Bears!

PM2017
Member
Posts: 522
Joined: January 20th, 2017, 5:02 pm
State: CA
Location: Enjoying College! :D
Has thanked: 22 times
Been thanked: 6 times

### Re: Astronomy C

I ESed my first event earlier this weekend, at the Polytechnic Invitational.

Here is the link to the folder (including test, image sheet, answer sheet, key, corrections to the key, and a solution manual for the calculations.): https://drive.google.com/drive/folders/ ... sp=sharing

Note: During the test, I also posted the equation Eddington Luminosity = 4piGMc/k on the whiteboards.
Also, the test was initially out of 120 points, but we had to invalidate question 1.f. in section 3, due to my mistake.

If you have the chance, please try to fill out this feedback form, so I can improve in later competitions: https://forms.gle/N14hYZukzthP6fWAA.

Finally, here are some statistics:
High score = 75/116
Q1 = 15, Median = 22.5, Q3 = 36
Average = 26.61
Standard deviation = 17.60

With no particular axes, here is the raw score distribution:
West High '19
UC Berkeley '23

Go Bears!

Ashernoel
Member
Posts: 345
Joined: January 27th, 2017, 1:31 pm
State: IL
Location: MA
Has thanked: 0
Been thanked: 2 times

### Re: Astronomy C

FYI, Donna and Tad posted the University of Chicago Astronomy Test and Key on the official soinc website: https://www.soinc.org/astronomy-c.
NT '19
Harvard '23

DanMV
Member
Posts: 2
Joined: August 16th, 2019, 11:43 am
Division: C
State: CA
Has thanked: 0
Been thanked: 0

### Re: Astronomy C

Could someone post the formula used to find the distance to a cepheid variable star since I haven't been able to find a formula that gives the correct answer consistently over multiple tests.

Ashernoel
Member
Posts: 345
Joined: January 27th, 2017, 1:31 pm
State: IL
Location: MA
Has thanked: 0
Been thanked: 2 times

### Re: Astronomy C

MIT Astronomy (1/25/2020) is up!

The other ESes and I are extremely grateful to have been invited by MIT Scioly and NSO to write this test for the community. We hope that competitors enjoy it as much as we did and that it inspires future learning. If you have any questions while reviewing or studying it, feel free to reach out with questions to any one of the co-writers!

Far more detailed statistics and results will be posted soon! The mean, standard deviation, and high score of the entire test were 42, 18, and 87. The means, standards deviations, and high scores for Sections A, B, and C were 28, 6, and 9; 7, 6, and 8; and 38, 20, and 31, respectively.
Last edited by Ashernoel on February 1st, 2020, 8:44 pm, edited 1 time in total.
NT '19
Harvard '23

heyitslynn
Member
Posts: 5
Joined: January 30th, 2020, 6:20 am
Division: C
State: DE
Has thanked: 0
Been thanked: 0

### Re: Astronomy C

Can anyone drop a binder for referencing or major sources they used for their binder, not so sure how or what to start on because this event is so hefty

Name
Member
Posts: 415
Joined: January 21st, 2018, 4:41 pm
Division: C
State: NY
Pronouns: He/Him/His
Location: Syosset
Has thanked: 22 times
Been thanked: 12 times

### Re: Astronomy C

heyitslynn wrote:
January 30th, 2020, 6:29 am
Can anyone drop a binder for referencing or major sources they used for their binder, not so sure how or what to start on because this event is so hefty
wikipedia, chandra site, whatever else shows up on google
South Woods MS, Syosset HS '21
Favorite Past Events: Microbe, Invasive, Matsci, Fermi
Events!: Astro, Code , Fossils
```UTA
Astro: 1
Code: 1
Fossils: 3```

Ashernoel
Member
Posts: 345
Joined: January 27th, 2017, 1:31 pm
State: IL
Location: MA
Has thanked: 0
Been thanked: 2 times

### Re: Astronomy C

Harvard AND Yale (2/1/20) Astronomy are up!

HUSO's Q8-10 may introduce more physics than has ever been a part of this event, but that's what makes them cool. One team made significant progress on them. Credit to Austin, awli [at] college, a fellow first-year for the questions.
NT '19
Harvard '23

ET2020
Member
Posts: 67
Joined: April 16th, 2018, 11:35 am
Division: C
State: NY
Location: FM
Has thanked: 0
Been thanked: 0

### Re: Astronomy C

Has anyone found good resources on gravitational waves? I haven't seen anything about them in the textbooks I use, and all of the online sources are pretty basic.
Fayetteville Manlius High School
2020 Events: Astronomy, Code, Dynamic, PPP

### Who is online

Users browsing this forum: No registered users and 1 guest