If you have an interest in a home observatory, you are not alone. Hobbyists and retirees are looking at the sky in increasingly sophisticated ways. And the home observatory can take many different forms. But first, from a practical standpoint, is this a reasonable hobby to pursue on the Eastern Shore? While we have relatively dark skies, we are not as pristine as say a mountain site in Colorado.
I posed that question to John Jardine Goss, president of the Astronomical League. He said that it really depends on what type of experience you want. “If the person is primarily interested in visually observing and imaging the planets using expensive equipment, an observatory makes sense. Planetary work doesn’t necessarily require dark skies, though it helps. However, visually observing galaxies, nebulae, and star clusters really requires a dark site to get the most out of the experience.” He made several other important points. “While the MD eastern shore does not have pristine, dark skies, many people would be surprised at the number of stars that can be seen. One test is whether or not the Milky Way can be discerned in the sky glow.”(Answer, yes. ) He also mentioned that skies tend to be darker when businesses close and residents go to bed…so 2 am is a better viewing time. John also said that the best telescope is “the one you will use.” Same with an observatory…it will not be worthwhile if you won’t use it.
OK, you are still interested in that observatory. Let’s say you want to build it on your existing house. First off, you will need to make sure the telescope is stable. The usual way of insuring that is to construct a dedicated pier for the telescope itself….the slightest movement from people walking on the floor will compromise the settings. Additionally, the floor cannot touch the pier. Of course, how the pier extends down through the house requires careful planning.
The form of the observatory can range from slide off or fold down roof hatch, to metal or fiberglas cylindrical dome. The dome, with an open slit or “clamshell” opening, rotates to allow for the earth’s rotation. The telescope, on a mount bolted to the pier is motorized so that it also rotates.
Domes are typically 6’ to 30’ in diameter. The smaller domes might be accessed from a terrace. Larger domes might have room for a stair, possibly with a hatch. Many stargazers want to share the experience with one or two guests. Importantly the observatory cannot be heated or cooled….It must the same temperature as the outside air. One reason you see so many white domes is they reflect heat better, though some manufacturers fabricate them in earth tones to blend in more with surrounding residences.
Computers are usually placed near the telescope but in a more comfortable setting, like a small office which might be just downstairs from the telescope.
Though this might be considered a hobby, you will need to check your local codes and get appropriate building permits. The highest you can build for a private residence in Talbot County is 40’. Insurance is also a consideration.
The price for home observatory can vary tremendously. People who are handy can construct a shed (once again…check with codes for this will be an “ancillary structure”) and have a simple slide or fold away roof. For more elaborate designs, well, you know…”the sky’s the limit.”
Pamela Heyne, AIA is head of Heyne Design, in Saint Michaels, Md.