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Teams

Citizen Sky is now officially permanent part of the AAVSO. In the coming weeks we will be moving additional content to the AAVSO site and freezing this site as an archive of the 1st three years of the project. Please visit the new landing page for future updates.

Scientific collaboration is an important part of any scientific project.  Citizen Sky teams are designed to bring participants with like interests and complimentary skill sets together to work toward a common goal.  You can create your own team or become a member of an existing team. For more information on the Citizen Sky team concept please visit the team overview page.
Popular Teams
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Citizen Sky
VStar Software Development

Variable star data visualization and analysis software development team.

43 members
Citizen Sky
DSLR Documentation and Reduction

To discuss various reduction and analysis techniques suitable for DSLR cameras and create...

54 members
Citizen Sky
Southern Gems

This group is working on identifying 10 bright variable stars viewable from the Southern...

26 members
Citizen Sky
The Mark I Eyeball Team

To determine the precision of visual variable star estimates according to a large number of...

12 members
Mira Fourier Coefficient Team

A team of citizen scientists embarked on a quest for mathematical gold in hundred-year-old data...

16 members
Citizen Sky
Developing A Visual Observing Program- June 2011

This course will focus on how to select stars to observe based on your equipment, site...

13 members
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Analysis (6)
Education (8)
Media (1)
Observing (7)
Outreach (3)
Software (2)

Active Posts

VStar feedback forum

By mikeu on November 16, 2009 - 2:52pm
Teams:

After you have downloaded VStar and run it, we would like to get feedback on what you think.

Choose New Star from AAVSO Database. Maybe one from the 10 Star Tutorial, or enter something like "P Cyg" (the current AAVSO Variable Star of the Season) for Other Star. Click on a datapoint in the graph to see the details. Try Change Series to select data from a different filter band. Drag the mouse on the chart to zoom in on a selection. Try out the different features and let us know if you have any problems, suggestions for improvement or just general comments on your experience using VStar.

The goal is to make VStar easy to use and to provide you with a tool for seeing how variable stars change over time. We'd like to know your impressions on how it looks and works. Thanks for taking the time to let us know what you think!Read more

An Introduction to the Team

By Maine_Star_Gazer on September 8, 2009 - 11:01am
Teams:

Hello everyone. Just a few words concerning my reasons for joining the Citizen Sky and what kind of equipment I use along with my observing habits.

I have always been intrigued with the thought of doing something I love to do and also have it add to the common good of human kind. Gazing at the stars, whether in my city lighted backyard or on some distant inky dark desert sky with binoculars, provides me with a great calming. Like listening to music that puts you at ease. No matter the stress of the day, the stars are always there (even if peeking out behind clouds) to ease me out of the day and into another.Read more

Figured out Air Mass Corrections

By bkloppenborg on June 10, 2010 - 9:33pm
Teams:

Greetings!

Just last week I completed my last finals, ever. Just Ph.D. work from here on out! I had a little time to work on air mass corrections. I've figured out a way to do it, now I just need to finish out the math for a least squares fit to points to make a plane. More details to follow later.

BrianRead more

zero point, AIP4WIN

By Chris Allen on July 16, 2010 - 1:10am
Teams:

I am currently trying to get to grips with the tutorials for both AIP4WIN and IRIS in terms of analyzing DSLR images.

In the AIP4WIN package, relating to the eps Aur sample images, what is a suitable zero point?

All the best,

Chris Allen / Sweden
www.variablestarsweden.seRead more

About Page for VStar Muck-ups

By nicocamargo on September 14, 2009 - 10:32am
Teams:

Vote please. Which one do you like best? Comments, requests, critiques are welcome.

Airmass / Extinction

By Bikeman on April 11, 2010 - 7:05am
Teams:

Hi all!

As summer is getting closer, I think it's time to look at extinction/airmass.

While some reduction packages have an airmass claculator, others don't, so I think it would be best to integrate airmass into the Excel spreadsheet.Read more

New Spredsheet version with optional extinction correction

By Bikeman on October 24, 2010 - 3:54pm
Teams:

Hi all

Since the old thread was somewhat framgemented I thought I'd start a new one.
For most observers eps aur will now be observable at relatively low air mass, so I thought it might be a good idea to extend the Excel sheet with a simple "toggle switch" that will switch on/off air mass correction. In the attached file, you can do just that in cell F51

1 ==> air mass correction is performed
0 ==> air mass correction is not performed (= extinction coefficient is set to 0. No need to input observation location coordinates and observation time in this case)

Note that for both cases, the error in the comparison star mag fit is shown, so that you can actually see by trying both settings which method gives the better fit. Read more

Avoiding Bias: Simonsen's Rules for Variable Star Observing

By mikesimonsen on September 4, 2009 - 8:38am
Teams:

There has been some recent discussion about looking at the light curve or checking the quick look data of a star you are observing. The main concern revolves around observers having too much information, or a preconceived notion, before making an observation. We call this bias. The term biased is used to describe an action, judgment, or other outcome influenced by a prejudged perspective. In variable star observing, or any scientific investigation, bias is a bad thing.Read more

IRIS tutorial review

By Bikeman on February 21, 2010 - 7:22pm
Teams:

Hi team!

I made a test run of the Iris tutorial with the sample images that Tom donated. I had a few problems so I changed the tutorial a bit, especially at the point when you extract the green channel.

I also made some screenshots that I sent to Brian in a ZIP (you can't attach ZIP files here and I was too lazy to attach each screenshot individually).

CS
Heinz-BerndRead more

New spreadsheet with automatic calculation of Tc and k'

By thomask on August 2, 2010 - 1:20pm
Teams:

I haven't noticed the Teams before and have now joined the DSLR team. I have uploaded my spreadsheet for reduction under "Final Reduction". This is the sheet I have used all along the campaign and it has worked very well. It has an automatic calculation of Tc, k' and Zp using the least-square method between the compairsion stars. After the coefficients is calculated they are applied to the variable star (epsilon in this case). Read more

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