Denver Astronomical Society

Denver Astronomical Society DAS hosts events and activities aimed at promoting amateur astronomy throughout Colorado and beyond. DAS does all the public outreach at Chamberlin Observatory.

Established in 1949 as the Amateur Telescope Makers, the name was changed a year later. One of the nation's largest and most active
astronomical societies ... since 1949! The Denver Astronomical Society hosts over 145 outreach activities each year, bringing the fascination, perspective, wonder, and joy of astronomy to thousands of children, teens and adults in the Denver metropolitan area. DAS pr

ovides trained volunteers who host Public Nights and Open Houses at the University of Denver’s Historic Chamberlin Observatory, which the DAS helped place on the National Register of Historic Places. First light at Chamberlin in 1894 was a public night of viewing, a tradition the DAS has helped maintain since 1949. The DAS is a long-time member in good standing of the Astronomical League, the International Dark Sky Association, the NASA/JPL Night Sky Network, the Antique Telescope Society and Western Area Astronomers (see Affiliations page.) Mission
Our mission is to promote the enjoyment and understanding of astronomical history, lore and phenomena by providing educational and observing opportunities for our members, education to the general public, and outreach activities at the University of Denver’s Historic Chamberlin Observatory and other venues. Activities
The DAS holds monthly meetings featuring outstanding presentations on a wide array of astronomical topics for its members and the public. These meetings feature opportunities to socialize and (except for society functions in March and December) are free of charge and open to the general public . After an orientation, members in good standing have full access to our premier Edmund G. Kline Dark Site near Deer Trail, Colorado, now equipped with a warming hut, fourteen 10-ft x 10-ft observing pads with electricity, and a vault toilet. The Brooks Observatory at the Dark Site features a 14-inch Celestron Schmidt-Cassegrain telescope on a Losmandy G-11 Gemini mount. The society’s public outreach activities include monthly open houses and twice-weekly public observing nights at Chamberlin Observatory, as well as lecture and star party programs for local schools and organizations. Each Autumn, the DAS coordinates Colorado Astronomy Day in association with DU, the Denver Museum of Nature and Science, and other organizations, featuring day-long activities at the museum, Chamberlin Observatory & across the state. The Society’s Van Nattan-Hansen Scholarship Fund provides support to qualifying Denver-area students seeking degrees in astronomy, space-science and related programs. The DAS is also active in the preservation of Chamberlin Observatory, spearheading the drive for its listing on the Register of Historic Places and recent renovation activities, including an extensive optical surface cleaning and mechanical renovation of the historic 20-inch Clark-Saegmuller refractor. The DAS is a 501(c)(3) tax-exempt corporation and has established three tax-deductible funds:

the Van Nattan-Hansen Scholarship Fund
the General Fund (includes outreach activities)
the Edmund G. Kline Dark Site Fund
To contribute to one of these funds, please see the membership application for details. Society Communication
The DAS publishes The Denver Observer (a monthly newsletter), maintains a page for members and the public and moderates a members-only Yahoo Group. Members who opt-in are sent ConstantContact Email announcements of newsletter publication, General Meeting topics, and special events.

From spaceweather.com - “ANOTHER CME IS COMING: The sun just launched another CME toward Earth. Minor (G1) to strong (G3...
06/07/2026

From spaceweather.com - “ANOTHER CME IS COMING: The sun just launched another CME toward Earth. Minor (G1) to strong (G3) geomagnetic storms are possible when it arrives on June 8th. If the storm becomes strong, naked-eye auroras could spread across much of Europe, Canada, and at least a dozen northern-tier US states.”

Spotless Days Current Stretch: 0 days 2026 total: 3 days (2%) 2025 total: 0 days (0%) 2024 total: 0 days (0%) 2023 total: 0 days (0%) 2022 total: 1 day (

The June 2026 DAS Astrophotography Gallery is now online! - https://www.denverastro.org/das-astrophotography-gallery-for...
06/06/2026

The June 2026 DAS Astrophotography Gallery is now online! -
https://www.denverastro.org/das-astrophotography-gallery-for-june-2026 - This month's gallery showcases an incredible variety of celestial and terrestrial targets from our talented ASIG members. Enjoy Andy Culler's North America and Pelican Nebulas, Roger Clark's stunning images of Kīlauea volcano beneath the night sky, Sam Falkner's Veil Nebula and Whirlpool Galaxy, Ciaran Rochling's Bode's and Cigar Galaxies, Richard Carande's Virgo Triplet and Jupiter, Rami's breathtaking views of Bode's Galaxy, the Cigar Galaxy, the Crescent Nebula and Soap Bubble Nebula, Teo Topcubasi's Hercules Cluster, Charlie Hagen's remarkable 197-hour image of Messier 90, and Tommy Lease's Hercules Cluster, Markarian's Chain, and detailed solar chromosphere images. As always, thank you to our ASIG members for sharing their work, techniques, and passion for astrophotography.

The hoped-for Aurora Borealis (a.k.a. Northern Lights) were, unfortunately, a bust. From spaceweather.com - “A DISAPPOIN...
06/06/2026

The hoped-for Aurora Borealis (a.k.a. Northern Lights) were, unfortunately, a bust.

From spaceweather.com - “A DISAPPOINTING CANNIBAL CME: A Cannibal CME struck Earth on June 5th (0511 UTC). Normally, such a CME would spark a strong geomagnetic storm, but this one did not. Its internal magnetic fields were relatively weak, so the CME's interaction with Earth was mostly minor (category G1). Indeed, we have not yet received any aurora photos from this event--a disappointing outcome for sky watchers.”

Spotless Days Current Stretch: 0 days 2026 total: 3 days (2%) 2025 total: 0 days (0%) 2024 total: 0 days (0%) 2023 total: 0 days (0%) 2022 total: 1 day (

“This Week’s Sky at a Glance” from Sky & Telescope:
06/05/2026

“This Week’s Sky at a Glance” from Sky & Telescope:

Venus and Jupiter pass through conjunction in the western twilight this week, while Mercury, Pollux, and Castor seem to watch from one side.

From spaceweather.com (Thursday, June 4) - “GET READY FOR AURORAS: Sky watchers in Europe and North America might see au...
06/04/2026

From spaceweather.com (Thursday, June 4) - “GET READY FOR AURORAS: Sky watchers in Europe and North America might see auroras tonight (June 4-5) if, as expected, a Cannibal CME strikes Earth. The impact could spark strong (G3) geomagnetic storms with isolated periods of severe (G4) activity. During similar storms in the past, naked-eye auroras have been visible in more than 25 US states. Pro tip: Get away from city lights!

“WHAT IS A CANNIBAL CME? Just what it sounds like. A CME that eats other CMEs. Yesterday, sunspot 4455 exploded several times and hurled multiple CMEs into space. One of the CMEs was so fast, it caught a slower CME and swallowed it.”

***

What the above means: There is a possibility the Aurora Borealis (a.k.a. Northern Lights) *might* become visible farther south than usual, perhaps as far south as mid-latitude locations. If you do plan on looking for Northern Lights, find an observing location away from bright city lights.

Spotless Days Current Stretch: 0 days 2026 total: 3 days (2%) 2025 total: 0 days (0%) 2024 total: 0 days (0%) 2023 total: 0 days (0%) 2022 total: 1 day (

06/03/2026

From spaceweather.com - "GEOMAGNETIC STORM WARNING: NOAA forecasters are predicting strong geomagnetic storms this week as a rare 'anti-Hale' sunspot peppers Earth with strong solar flares. The X-class and near-X-class explosions are currently happening every 6 to 8 hours with CMEs expected to reach our planet beginning June 5th. Mid-latitude auroras are possible after the CMEs arrive."

Send a message to learn more

TICKET ALERT - TONIGHT!We just had a last-minute cancellation for an Astronomy Night event at Chamberlin Observatory TON...
06/02/2026

TICKET ALERT - TONIGHT!
We just had a last-minute cancellation for an Astronomy Night event at Chamberlin Observatory TONIGHT, June 2nd, at 8:30 p.m. We have THREE tickets available!

EDIT: we're all sold out!

==============

If you've been trying to find an opportunity to tour the DU's beautiful Chamberlin Observatory and perhaps peek through the 20" refractor telescope, now is your chance!

Reserve your tickets NOW at
https://www.denverastro.org/reservations/

* * * * *

All Astronomy Nights start with an informative, multimedia astronomy presentation by a DAS lecturer. Astronomy presentations are designed for visitors of all ages and may be illustrated with colorful computer graphics, videos, and other audio-visual methods as appropriate.

After the presentation, visitors may be treated to telescopic views of the moon, stars, star clusters, planets, galaxies, and nebulae, all through Chamberlin’s historic, 28-foot-long, 20-inch-aperture Alvan Clark-Saegmuller refracting telescope (weather permitting). On cloudy nights, visitors can view the telescope, learn about it, and receive a tour of the observatory, which includes its various clocks, the meridian telescope, the library, wall displays, and an animated video of the night sky for that month. DAS volunteers will be happy to answer questions about astronomy, astronomical observing, and the observatory.

* * * * *

After the presentation, visitors may be treated to telescopic views of the moon, stars, star clusters, planets, galaxies, and nebulae, all through Chamberlin’s historic, 28-foot-long, 20-inch-aperture Alvan Clark-Saegmuller refracting telescope (weather permitting). On cloudy nights, visitors can view the telescope, learn about it, and receive a tour of the observatory, which includes its various clocks, the meridian telescope, the library, wall displays, and an animated video of the night sky for that month. DAS volunteers will be happy to answer questions about astronomy, astronomical observing, and the observatory.

Trustee Emeritus Jack Eastman: More Than Half a Century with DAShttps://www.denverastro.org/trustee-emeritus-jack-eastma...
06/01/2026

Trustee Emeritus Jack Eastman: More Than Half a Century with DAS
https://www.denverastro.org/trustee-emeritus-jack-eastman-more-than-half-a-century-with-das/

During the recent Open House at Chamberlin Observatory, DAS honored longtime member Jack Eastman with several special recognitions celebrating his decades of service to astronomy and the Society. From Griffith Observatory and telescope making in the 1950s to decades of leadership, outreach, and observing with DAS, Jack’s story reflects a lifetime spent sharing the night sky with others. Read more about Jack’s remarkable astronomy journey and his lasting impact on generations of amateur astronomers.

TICKET RELEASE!We have just released 104 Bonus Astronomy Night tickets for June, including some new Saturday night relea...
06/01/2026

TICKET RELEASE!

We have just released 104 Bonus Astronomy Night tickets for June, including some new Saturday night releases 🤩!

Grab them while you can and come see us at DU's historic Chamberlin Observatory!

https://www.denverastro.org/reservations/

All Astronomy Nights start with an informative, multimedia astronomy presentation by a DAS lecturer. Astronomy presentations are designed for visitors of all ages and may be illustrated with colorful computer graphics, videos, and/or other audio-visual methods as appropriate.

After the presentation, visitors may be treated to telescopic views of the moon, stars, star clusters, planets, galaxies, and nebulae, all through Chamberlin’s historic, 28-foot-long, 20-inch-aperture Alvan Clark-Saegmuller refracting telescope (weather permitting). On cloudy nights, visitors can view and learn about the telescope and receive a tour of the observatory, which includes its various clocks, the meridian telescope, the library, wall displays, and an animated video display of the night sky for that month. DAS volunteers will be happy to answer questions about astronomy, astronomical observing, and the observatory.

What’s Up in Denver? June 1st through 7th, 2026 - https://www.denverastro.org/whats-up-in-denver-june-1st-through-7th-20...
05/31/2026

What’s Up in Denver? June 1st through 7th, 2026 - https://www.denverastro.org/whats-up-in-denver-june-1st-through-7th-2026 -Join the Denver Astronomical Society this week for our ASIG General & Beginner Meeting, plus Standley Lake Stargazing's weekly livestream. Then head outside for an amazing weekend under dark skies with Astronomy in the Park at Rocky Mountain National Park on Friday, Astronomy Night with Northern Colorado Astronomical Society at Sylvan Dale Ranch on Saturday, and Astronomy Night with Colorado Springs Astronomical Society at Florissant Fossil Beds National Monument Saturday night as well. You can also catch Jupiter, Venus, and Mercury grouped together after sunset, and look for famous globular clusters like Messier 13, Messier 12, and Messier 10 reaching their highest points in the sky.

Address

2930 E Warren Avenue
Denver, CO
80210

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