Astronomy 16 – Astrophysics: Stars, ISM, and Galaxies

Prof. David Cohen

Fall 2017
Tu., Th. 9:55 to 11:10
SC 113 (seminar room)


spectral types M 43 Andromeda





posted 6/14

Our first class meeting will be on Tuesday, September 5 at 9:55 am. Expect to get a reading assignment (that may include a short worked problem or two) about a week before the first class meeting.


posted 6/14

An assignment to help you prepare for the first class meeting will be posted here about a week before classes start.

Do what you can to see the solar eclipse on August 21. It will be partial in Philadelphia but the path of totality stretches from Oregon to South Carolina.

Upcoming Events

Astro 16 students are members of the Department of Physics and Astronomy, and are encouraged to participate in department activities beyond the classroom. This includes attending regular talks – colloquia given by visiting scientists. Check the department colloquium schedule to see the list of talks (to be posted by the beginning of the semester). You'll find titles and descriptions of the talks, which are generally on Fridays at lunchtime.

You can also attend, and help out with, the monthly telescope open houses at the Peter van de Kamp Observatory, on the roof of the Science Center. This activity is optional, but fun. Bringing your friends is a good way to show them what all the astronomy excitement is about!


Class Information

Prof. Cohen's office hours will generally be: Tuesday and Thursday from 1:30 to 3:00 and Friday from 11:00 to noon; weekly deviations from this schedule will be posted here

Prof. Cohen's office is SC 125 and his lab is SC 124, right across the hall

A syllabus [pdf] with information about the class as well as a schedule of topics, reading, labs, and exams (updated 6/14) is available – note that it will be periodically updated


Astronomy Picture of the Day

what's up in the sky this week

gravity simulator

Planet Crash

a Java-free orbit simulator

using your hands to measure angles

planets, Moon, Sun rise and set times (we are near 40 deg N and 75 deg W)

sky almanacs

sky and weather information

observatory website

department website



This page is maintained by David Cohen
cohen -at-

Last modified: June 18, 2017