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 12/7

New homework (due Tuesday) and an assignment for our next, and final, class – posted below.

Information about the final will be posted here shortly. New (12/11): See the assignments section for information about the final.

Archive of old announcements


posted 12/11

The final exam will be on Friday, December 15 at 9 AM in SC 181. You can read the information about the exam [pdf]. Note office hours posted to the right.

posted 12/7

Read the assignment for class 26 [pdf] to prepare for Tuesday's class. Take a look at the slides [pdf] referred to in the assignment.

Homework assignment 8 [pdf] is due on Tuesday, December 12 at 5pm.

Study this good sketch of the Milky Way. And marvel at this photo montage of the Milky Way.

Sparke and Gallagher Milky Way

posted 12/5

Read the assignment for class 25 [pdf] to prepare for Thursday's class. Take a look at the slides [pdf] referred to in the assignment.

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 fall semester colloquium series is over as of November 17.


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 –
This week (12/11-15): I'm adding 11:30 to 1:00 on Wednesday to the regular 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 11/21) 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

Messier Monday blog database

Tapir exoplanet transit observation planner


SIMBAD Astronomical Database

airmass plotter from Tapir

annotated finding charts also from Tapir

sky and weather information


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: December 11, 2017