The AAAP Occultations and Transits Special Interest Group (OTSIG) is a special section of the club devoted to observers who enjoy observing the occultations by the Moon, asteroids, and other bodies in the solar system, as well as transits by the moons of Jupiter and planets across the Sun.
For timely updates pertaining to occultations visible from the Pittsburgh area, such as observing sites and rendezvous instructions for grazing occultations, finder charts for upcoming asteroidal occultations, or meeting dates for this Special Interest Group, please visit John Holtz' Occultation Updates page.
Occultation: the obscuration of one celestial body by another of greater apparent diameter, especially the passage of the Moon in front of a star or planet. -- Astronomical Almanac.
In plain English, one object completely covers another! -- John Holtz.
There are four primary types of occultations that the Occultations & Transits Special Interest Group (OTSIG) will focus on.
Lunar and asteroidal occultations can provide valuable scientific data, provided the following information is recorded:
A transit occurs when a smaller object passes directly in front of the larger object: the opposite of an occultation. There are two types of transits that the OTSIG will focus on:
Occultations and Transits SIG pages
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