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Frosty Drew Observatory: Our Equipment

The Frosty Drew Observatory has numerous telescopes and accessories for viewing the skies above thanks to generous supporters, donors, and grants. Below we explain some of our more popular telescopes and accessories that you are sure to see on our publicly open nights. At the center of our astronomical operations is our Ash dome, an 18 foot enclosure that houses our main telescope and serves as our central hub on nights open to the public. The dome was erected in 1986 after the site was realized for its fantastically dark skies. Since its opening in 1986 Frosty Drew Observatory has been a local icon for astronomical observation.

Meade LX200 SCT 16 Inch TelescopeMeade LX200 16" SCT

Our center piece is a Meade Schmidt Cassegrain LX200 16" (4064 millimeters) telescope fork mounted on an alt-azimuth pier. It was installed in July of 1999. You can keep up with its accomplishments in the Frosty Drew Observatory Life List. The words Schmidt and Cassegrain are the names of telescope designers who created this basic type of telescope. A Cassegrain telescope has a hole in the mirror at the back end of the telescope. This allows the eyepiece to remain at a convenient level and easy to reach. A Schmidt telescope uses a thin glass plate, called a "corrector plate", at the front of the telescope to correct various optical distortions (aberrations). The combination of these two designs allows a long focal length to be folded into a relatively shorted tube. A 16" Newtonian telescope (straight through design) with an f10 focal ratio would be over 13 feet long. This would be extremely awkward to use in a dome with a 9 foot radius. The Schmidt Cassegrain design folds this into a barrel about 3 feet long. Our telescope is up-to 7 feet long when attaching the dew shield alongside other attachments.

Our Meade LX200 telescope can keep pace with almost every object in the sky except objects moving faster than 4 degrees per second (meteors and rocket launches). It has three independent rotations, around the horizon, up and down, and even turning instruments and eyepieces to keep the same view. All of this is controlled by an embedded computer coordinated with an external computer for locating objects.

Art Guarino 10 Inch Dobsonian TelescopeThe Art Guarino Telescope - 10" Custom Dobsonian
Art Guarino, a prior Frosty Drew Director of Astronomy, had donated his 10" Dobsonian with fine Park Optics. Art had manufactured this telescope himself using basic materials that are easy to come by and inexpensive to acquire. It is frequently in use outside the Observatory and offers alternative views of celestial objects. This Dobsonian telescope is a fantastic instrument for scanning the skies when comet hunting.
Orion XT8 Dobsonian Telescope - Marianne PhilipsOrion XT8 Dobsonian
Mrs. Marianne Philips of Charlestown donated to Frosty Drew this unused 8" Orion SkyQuest XT8 Dobsonian Telescope. This telescope has fantastic optics, with visual observation that rivals the performance of The Art Guarino 10" Dobsonian Telescope. Due to its portability, ease of use, value, and stunning performance, the Orion XT8 is our top recommended telescope for novice users inquiring about their first telescope purchase. This telescope can be frequently found setup outside the Observatory during events offering views of the Moon, deep sky objects, comets, and planets.
Orion XT8 Dobsonian Telescope - Stephen DayOrion SkyQuest XT8 Dobsonian
Mr. Stephen Day of Ashaway donated to Frosty Drew this excellently maintained classic 8" Orion SkyQuest XT8 Dobsonian Telescope. This telescope is in excellent condition considering its age, and pairs nicely with the Marianne Philips Orion XT8. Upon deeper evaluation of this telescope we had identified three custom modifications that Mr. Day had made, which are genius! He integrated an OTA carrying mechanism, simple spring attachment straps (this is awesome as attaching the tube springs to the mount often results in abrasions on your hands), and a basic attachment to the underside of the OTA aperture end to aid in slewing. We will be integrating this telescope into our program this summer. Stop in to see it in action, mods and all!
Questar 3.5 Inch Maksutov Cassegrain TelescopeQuestar 3.5 MCT

Mrs. Camilla Lee of Narragansett donated her step father Ryder Henry's 40 year old Questar Maksutov Cassegrain telescope. The telescope has been repeatedly sent to the factory in New Hope Pennsylvania for cleaning and improvements. This 50 year old telescope has many of the features of a much newer instrument. The optics of early Questar telescopes were unmatched in their day and still compare very positively with the best modern optics.

Meade 2080 8 Inch Schmidt CassegrainMeade 2080 8" SCT
A rather old Meade 2080 Schmidt Cassegrain telescope was donated to Frosty Drew and was in need of some serious love. After a significant overhaul this quality 8" SCT has been integrated into our events fitted with a white light filter, camera, and laptop. This telescope produces live telescopic views presented in the Sky Theatre, Observatory, and on screens around the campus. We have collected quite and archive of Solar and Lunar photography with this fine telescope.
Lunt LS100THa Hydrogen Alpha TelescopeLunt LS100THa Hydrogen Alpha Telescope
The Champlin Foundation granted us the funds to purchase a Lunt LS100THa hydrogen alpha solar telescope with the double stack etalon. This telescope offers fantastic views of the solar chromosphere including sunspots, the magnetic field lines of the Sun, and prominence. We set up this telescope during our Summer Stargazing Nights events, which run every week from Memorial Day - Labor Day. We also setup this telescope on Friday mornings at the Charlestown Land Trust Farmers Market, as well as any event themed on viewing the Sun, like eclipses and transits.
Interfacing with Stellarium on LaptopAutomation

If the computer only controlled the speeds so well it would be impressive but it does lots more. It knows the position of about 64 thousand deep space objects including all the planets. It determines the position of the telescope on the Earth to an extremely precise angle. It keeps track of the time, and controls all the attachments of which we have many. With a little help from the standard PC attached by a communications line, it can extend the number of deep space objects to over 19 million including newly discovered objects (comets, novae and new artificial satellites).

We can connect many different cameras and imaging devices to the telescope. Using this technology, we have been able to archive many of the objects we regularly view. These archived photos are displayed weekly in the Sky Theatre, our website, and social networks.

We have a fine selection of top quality eyepieces and their accessories. Augmenting the eyepieces are diagonals (both 45 and 90 degrees), tele-extenders, Barlow lenses (eyepiece magnifiers), a framing reticule (like cross hairs), and colors and special purpose filters of all kinds. We have flip mirror attachments to allow us to flip between the imaging devices and the eyepieces. We even have an electric focusing mechanism that allows us to individually adjust the eyepiece for each person using the telescope.
The Frosty Drew 16 inch SCT in useFunctionality

For managing photography or CCD imaging we have an off axis guidance system. We have a camera piggyback adapter, a guide telescope, T-adapters and ring adapters for our Canon camera. To keep the telescope in good balance with all of these various weight attachments we have a self contained counterweight system.

Special software controls all these functions. Some of it allows us to direct the telescope to anything in the sky, even new found objects like supernova and first time comets. The rest of the software manages the CCD imaging device. We are able to show real time images of what the telescope is seeing. This software allows us to enhance images and to convert light seen through filters to color pictures.