the time of aphelion passage
41Comet Arend–Roland — C/1956 R1 (Arend–Roland) Discovery Discovered by: Sylvain Arend, Georges Roland Discovery date: 1956 Alternate designations: 1957 III, 1956h, C/1956 R1 …
42List of radio propagation topics — This is a list of radio propagation terms. NOTOC A a index A index aa index active prominence active prominence region (APR) active region active surge region (ASR) active dark filament (ADF) AE index Air Force Geophysics Laboratory (AFGL) arch… …
43Transition Comets — UV Search for OH Emissions in Asteroids — was a study involving amateur astronomers and the use of the Hubble Space Telescope. This was one of only six studies involving amateur astronomers that was approved by NASA. [Hubble News Releases Archives… …
44Near-Earth asteroid — Near Earth asteroids (NEAs) are asteroids whose orbits are close to Earth s orbit. All near Earth asteroids spend part of their orbits between 0.983 and 1.3 astronomical units away from the Sun. Some near Earth asteroids orbits intersect Earth s… …
45Thread (Pern) — Thread is the name of a deadly phenomenon that appears throughout Anne McCaffrey s series of science fiction novels about the fictional planet Pern. Thread are thin silver filaments of a space borne mycorrhizoid spore that devours all organic… …
46Great Comet of 1843 — Infobox Comet name=C/1843 Dl discoverer= discovery date=February 5, 1843 designations=Great Comet of 1843, Great March Comet, 1843 I, 1843 D1 epoch=2394259.411 semimajor=64 AU perihelion=.005527 AU aphelion=129 AU eccentricity=0.999914 period=515 …
4773P/Schwassmann–Wachmann — 73P/Schwassmann Wachmann SW3 Component C, 19 APR 2006 from Mt Laguna. Discovery Discovered by …
