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 10/19

This week will focus on the lab projects and reviewing for the midterm – which will be on Monday night, October 30, during our usual lab time. And we'll finish up the material from Ch. 14 and also look at the Sun, weather permitting.

We will have a lab meeting this Monday night, too. That will be an opportunity to work on/plan your observing project. The won't be any new lab work, but there will be a little reading from Ch. 6.

There is an astronomy colloquium this Friday – Prof. Andrea Lommen from Haverford will be talking about gravitational radiation. Please come, it should be interesting.

Archive of old announcements


posted 10/20

For our lab meeting on Monday night ‐ work on your data, answer your question, or work on posing a question and planning your observations if you haven't done those things already.

For class on Tuesday, review the second half of Ch. 14 – luminosity class and the HR diagram.

The lab information and the HR diagram and spectral type and luminosity class slides from last week are still posted – now on the old assignments page, linked below. You'll be using them for your work this coming week.

Archive of old assignments

Upcoming Events

The department has regular talks – colloquia – given by visiting scientists. Check the department colloquium schedule to see the list of talks. You'll find titles and descriptions of the talks, which are generally on Fridays at lunchtime. We will have four or five this semester, with at least one on astrophysics. The next talk is indeed the astrophysics talk. It is on Friday, November 3 – New Date: Friday, October 27 – and will be given by Prof. Andrea Lommen of Haverford, and will be on the subject of gravitational radiation.


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 – New: Just for this week I will have to cancel my Friday office hours.

Prof. Cohen's office is SC 125 and his lab is SC 124, right across the hall; Ms. Klassen's office is one floor below, in SC L36

A syllabus [pdf] with information about the class as well as a schedule of topics, reading, labs, and exams (updated 10/3) is available – note that it will be periodically updated

Please also read these guidelines about the class [pdf], including rules for the classroom but also information about the growth mindset and about equity and inclusion


Astronomy Picture of the Day


gravity simulator

a Java-free orbit simulator


what's up in the sky this week

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


observatory website

department website

class Moodle page



This page is maintained by David Cohen
dcohen1 -at-

Last modified: October 20, 2017