Navigate to <https://astromancer.skynet.unc.edu/home>\
Click "Variable OPIS!"

Click "Upload Data File"\
Upload the .csv you downloaded in the previous part of the assignment.

Remember what number Afterglow assigned your variable star when you clicked on it? You wrote it down. Choose that number in the dropdown next to "Select Variable Star". For me it was 0, which was the first source, so I'm choosing "Source 1"

Go back to the finder chart in your assignment. There is an apparent magnitude listed for the reference star. Copy that.

Semester: Northern-Hemisphere Fall (Southern-Hemisphere Spring)
Globular Cluster: NGC 1261
Reference Star’s Apparent Magnitude: 13.87

(enlarge)

Semester: Northern-Hemisphere Spring (Southern-Hemisphere Fall)
Globular Cluster: NGC 3201
Reference Star’s Apparent Magnitude: 13.60

(enlarge)

Semester: Northern-Hemisphere Summer (Southern-Hemisphere Winter)
Globular Cluster: M28
Reference Star’s Apparent Magnitude: 12.98

(enlarge)

Click the "Reference Star Actual Magnitude" field.

Paste that magnitude into "Reference Star Actual Magnitude."

x
y
Title
Variable Star Mag + (13.87 - Reference Star Mag)
55 139
55 140
55 141
55 142
55 143
55 144
16.3
16.35
16.4
16.45
16.5
16.55
16.6
16.65
16.7
16.75
16.8
16.85
16.9
16.95
17
17.05
Highcharts.com

Give your chart a useful title. We are graphing brightness over time.

Label your x and y axes. X is time, Y is how bright the star is.

Click "Submit"\
It will save to your computer.\
Insert this graph into your assignment.

Plotting Tool: Graph the Change in Brightness - new tool