For the Curious
The Custer Institute and Observatory is Long Island's oldest public observatory (est.1927). Open to the public every Saturday evening from dusk until midnight, our staff of volunteers will give you a tour of the facilities and the night sky through our powerful telescopes. Custer has a library, museum, and gift shop. Frequent lectures, classes,concerts, art exhibits and other special events.
Saturday Night Observing: Open 7pm-Midnight
Contact a human: Call, E-mail, and Visit
As an all-volunteer organization, we can only guarantee to check phone messages when we are there Saturday nights.
The Custer Observatory's phone number is:
We are located at
|Our mailing address is:
PO Box 1204
Southold, New York 11971
David van Popering, Vice President:
Barbara Lebkeucher, Treasurer:
Matt Campbell, Finance Chair: