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2018 General Meetings & Special Events

CAS Monthly Meetings and Astronomical Programs are held the Saturday closest to the Full Moon at the Mars Hill Campus of Lowell Observatory, Hendricks Center for Planetary Studies Auditorium (6:45 pm - 8:00 pm., unless otherwise noted) followed by refreshments, and informal discussion. Meetings are open free to the public.



Saturday, January 27, 2018

Dr. Jennifer Hanley, Lowell Observatory


Title: “Liquid Stability Across the Solar System”

When identifying potential life elsewhere in the Solar System, liquids are a key ingredient. Water is proposed to be present on Mars and the subsurface of Europa, while Titan has seas of hydrocarbons. Dr. Hanley will discuss the recent identification of hydrated salts in Recurring Slope Lineae, indicating flowing liquid water on the surface of Mars today, and present results from laboratory experiments and how they relate to observations from current and past missions to Mars, Europa and Titan.



Saturday, February 24, 2018

Dr. Tyler Robinson, NAU


Title: “Weird Worlds and the Hunt for Life Beyond Earth”

Astronomers now know of thousands of worlds orbiting other stars in our Galaxy. These so-called “exoplanets” are surprisingly diverse, spanning giant planets with super-heated atmospheres to small rocky worlds with rock vapor in their air. These findings are leading up to the discovery we all wait for – another planet like our own!



Saturday, March 31, 2018

Dr. Diedra Hunter, Lowell Observatory


Title: “Extended Stellar Disks of Dwarf Irregular Galaxies”

Outer disks of dwarf irregular galaxies are extreme environments at the lowest observable limit for star formation. Yet the stars that are present often have near perfect exponential profiles, suggesting an ability to organize into a standard disk which no current models can explain. Dr. Hunter will discuss ultra-deep imaging of the outer disks of dwarf irregular galaxies and what it reveals about the nature and mysteries of the extreme outer parts of tiny galaxies.



Saturday, April 28, 2018

Dr. Cristina Thomas, NAU


Title: “The Exciting Future of Asteroid Science”

Future new observations will add to our understanding of the small rocky bodies in our Solar System. The OSIRIS-REx spacecraft will visit near-Earth asteroid Bennu in mid-2018 to study its surface before returning a sample to Earth. The James Webb Space Telescope will launch in 2019 with a suite of instruments that will further our understanding of the compositions of asteroids. With the recent discovery of the first interstellar object, we look forward to what can be learned about planetary systems other than our own.



Saturday, May 26, 2018

Dr. Dale Gary, NJ Institute of Technology


Title: “Multi-Frequency Radio Imaging of the Sun”

A new radio facility, the Expanded Owens Valley Solar Array (EOVSA) began operating in early 2017, providing a panoramic view of the radio Sun over a wide range of radio frequencies. Highlights of these images, including sunspot regions, solar flares, and the science behind them will be discussed. A radio movie of the solar eclipse obtained with EOVSA, will show the covering of sunspot regions as the Moon transits the Sun. Other eclipse observations compare the VLA with those of EOVSA, creating a 3-D solar view.



Saturday, June 9, 2018

Dave & Kris Frisk’s Observatory, Williams


Title: Annual CAS Picnic and Observing Meeting

Open to CAS membership and invited friends – Time: 6:00 pm



Saturday, July 28, 2018

Dr. Klaus Brasch, CAS


Title: “Life in the Cosmos: when, where and how?”

The origin of life is a major unanswered issue in science. The question is as old as humanity, and explanations have ranged from special creation, to bio-chemistry, to propagation across the Universe by natural forces and even deliberate transmission by technologically advanced civilizations. The discovery of potentially habitable exoplanets and the possibility of life elsewhere in the solar system has renewed the focus on this question. We review some of the key issues involved and the notion that the viable transfer of organisms between planets and beyond may have played a role.



Saturday, August 25, 2018

Dr. Julie Webster, Director: Cassini Mission


Title: “The Cassini Mission at Saturn”

The Cassini spacecraft, the largest outer planetary vehicle built by NASA, was launched Oct. 15, 1997. To reach Saturn, it needed almost seven years and four gravity assists from Venus, Earth and Jupiter. The first spacecraft to orbit Saturn, Cassini mapped Saturn1s magnetosphere, discovered previously unknown moons, found at least two moons that might be habitable for life, and studied Saturn1s atmosphere and rings. It made its Grand Finale on Sept. 15, 2017, plunging into Saturn1s atmosphere. Dr. Webster will describe the 20 year mission, and the science that will be analyzed for generations.



Saturday, September 22, 2018

Dr. Chadwick A. Trujillo, NAU


Title: “The Search for an Undiscovered Giant Planet in our Solar System”

In the last few years, evidence has increased that there may be an undiscovered giant planet lurking in the outer reaches of our solar system. This planet could explain some of the unusual orbits we see in the most distant Kuiper Belt Objects. I'll discuss why we think the planet may be visible in the autumn night sky and how we are using the most powerful survey telescopes in the world to search for it.



Saturday, October 20, 2018

Tom Polakis, Con. Ed. Astronomy Mag.


Title: “CCD Photometry from Inside the Light Dome”

Tom Polakis has pursued photometry with his CCD imaging equipment in Tempe for several years. He has determined rotation periods of asteroids, measured the brightness and colors of eclipsing binary and pulsating variable stars, and measured light curves of exoplanets and an active quasar. Mr. Polakis will describe the fundamentals of photometry, his equipment, data acquisition, and data reduction, and will show examples illustrating how measuring variations in star light gives us our understanding of the stars.



Saturday, November 17, 2018

Title: CAS Member Activity Presentations

Each year CAS members are active in the pursuit of their avocation of Astronomy. At this meeting 4-6 members will present 10-15 minute overviews of the activities and achievements they were involved in during the preceding year.



Saturday, December 1, 2018 - Time and Location TBA

Annual CAS Holiday Party

Open to CAS membership and invited friends.




© 2016 Klaus Brasch

Hello Everyone,

We wish you all the best for the coming year 2018 and hope that this image of the Orion nebula is a reminder of the beauty and majesty of the universe we live in, regardless of the turmoil that seems to dominate much of the tiny planet we call home.

. . . Klaus and Margaret       



Williams Public Viewing
Friday - ( 7 - 9 )

Contact: Barry 928-814-6367

April 20, 2018
May 18, 2018
June 22, 2018
July 20, 2018
Aug. 17, 2018
Sept. 14, 2018
Oct. 19, 2018

Directions for Williams

Location: Glassburn Park - in the natural area west of Rod’s Steakhouse parking lot. Take I40 west. Exit 165 into Williams. The park is about 2-3 blocks after the hill, just past the edge of town on the right.

Club Observing
Saturday - ( at Sunset )

RSVP to David 928-607-9189 dfrisk41@gmail.com

Jan. 13, 2018 ( 5:38 )
Feb. 10, 2018 ( 6:06 )
March 10, 2018 ( 6:32 )
April 14, 2018 ( 7:01 )
May 12, 2018 ( 7:24 )
June 9, 2018 ( 7:43 )
July 14, 2018 ( 7:44 )
Aug. 11, 2018 ( 7:22 )
Sept. 8, 2018 ( 6:46 )
Oct. 6, 2018 ( 6:05 )
Nov. 3, 2018 ( 5:32 )
Dec. 8, 2018 ( 5:16 )

Board Meetings
Thursdays at 7 pm

January 18, 2018
March 15, 2018
May 17, 2018
July 19, 2087
September 20, 2018
November 15, 2018




M31 - a mosaic of 8 images
© 2014 Klaus Brasch



Lunar Eclipse - April 15, 2014
© 2014 Richard McMichael



The Triangulum Galaxy (M33)
© 2015 Eric Marlatt



Buffalo Park Star Party 2015
© 2015 Russ Ruggles

CAS Programs & Speakers

Located in Flagstaff, AZ, the CAS draws expert program speakers from many sources, including Lowell Observatory, the U.S. Geological Survey, the Naval Observatory, Northern Arizona University, Coconino Community College, as well as from other Arizona based organizations, our own knowledgeable membership, and occasionally from other state astronomical groups. CAS also helps STAR School, near the Navajo reservation, as well as the Hopi with their astronomical programs.

Williams Public Observing

On the Friday evening closest to First Quarter Moon, April through October, CAS hosts its monthly community outreach program to educate and promote interest in Astronomy to the general public. CAS members set up their telescopes at Glassburn Park in Williams, and invite the public free of charge to observe the Moon and other visible objects in the night sky

The general public is always cordially invited to attend any of our public presentations free of charge.

CAS Membership
We welcome anyone interested in astronomy

Membership in CAS is open to anyone interested in learning more about astronomy and telescopic ob- serving. Membership entitles you to attend, and be involved with, the monthly general meetings, as well as special club events, observing sessions, and star parties, at our Dark Sky Observing Site. Annual events and monthly meeting reminder postcards with current happenings are mailed to all Members.

Besides “Regular Membership,” CAS has available “Household Memberships” for two adults at the same address, “Junior Memberships” for students, as well as “Sponsoring Memberships” for those wishing to help support the Society.

If you are interested in becoming a member use the brochure application form, or the one on our website. For any questions you can email us at: info@coconinoastro.org, or contact Andy Barnett, CAS Treasurer, at (928) 527-1199 (evenings).





Milky Way and Pines
© 2014 Klaus Brasch



M1 - the Crab Nebula
© 2014 Russ Ruggles



What's happening in the sky and when!




Past Calendar archives






The Grand Canyon Star Party

June 9–16, 2018

      Information is available at the following website:








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