DAS Activities

DAS Public Nights

Public Nights
Tuesday and Thursday at
DU's Historic Chamberlin Observatory
Current start time is 8:30 pm.

Costs to the public are:
$4.00 adults, $3.00 children

To book, please click:

Public Night Reservations



Membership & Donations

Join the DAS | Donations

To join the DAS, please click on the “Join the DAS” link above. You will be sent to the DAS Portal.
There you can select the appropriate membership level and read about the benefits of joining the DAS.
Members can also donate to the DAS in the DAS Portal.

We welcome and deeply appreciate donations to the society by non-members.
Donations are tax deductible.

Click on the “Donate” link below to make a non-member donation to the DAS using PayPal.


If you cannot join or donate using a credit card, you may use the mail-in order form, paying with a check.

Benefits of DAS Membership

  • Free access to the DAS Member Portal, opened in October 2018. Participate in member Forums; learn about DAS events, including member and guest parties and banquets; browse member astronomical images; receive notices of DAS activities and publications; manage your membership.
  • Learn more about astronomy and CCD imaging! Contact with over 500 professional and amateur astronomers through educational monthly meetings, the forums on our member portal, and public outreach activities.
  • Hone your observing skills! Participate in Messier marathons, star parties, member in-reach workshops and other activities.
  • Access to dark skies! Anytime access to the E.G. Kline Dark Site near Deer Trail, CO for observing & imaging.* (See note below)
  • Contribute Useful Data to Science. Use your skills to collect scientific data on variable & double stars, asteroids, occultations & eclipses.
  • Discounted subscriptions and book offers from Sky & Telescope and Astronomy magazines.
  • Checkout privileges for the extensive and historic collection of books and periodicals in the Chamberlin Observatory library.
  • Access to several club-owned loaner telescopes for personal observing. (After 1 month of membership)
  • Fun social activities, including a summer picnic, holiday party in December, and annual banquet in March.
  • Participation in public education programs, providing observing opportunities, multimedia presentations, and speakers at Chamberlin Observatory and for Front Range schools and civic groups; Space Day in the spring, Colorado Astronomy Day in the fall.
  • A valuable included membership in the Astronomical League, which provides:
    • subscription to The Reflector, the AL’s quarterly magazine,
    • book discounts
    • special member rate for the annual ALCON conference
    • recognition of your observing/imaging achievements and public outreach activities through access to the AL’s observing clubs, public outreach, and Master Observer programs
    • knowledge that you are supporting amateur astronomy and public education through national outreach activities.

* New members may use the dark site immediately, but must receive an orientation from a Dark Sky Committee member on a Dark Sky (new moon) Weekend to use all of the facilities independently.

Additional Information

The DAS is a 501(c)(3) tax-exempt corporation and has established three tax-deductible funds:

Feel free to ask: Membership Coordinator (membership, renewal, signup questions) or
Webmaster (problems with the site)