By H. A. Buchdahl
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Additional resources for An Introduction to Hamiltonian Optics
Among them are the Jupiter Trojans. In general, Trojans are asteroids that are in the same orbit as a planet but are either 60° ahead or behind the planet, at the so-called L4 and L5 Lagrange points. When you see or hear just “Trojans”, it is generally understood to mean those in the same orbit with Jupiter, but Mars has some Trojans, as do some of the other planets. When in doubt, give the planet name as well. Two other asteroid groups of interest are the Hildas, which lie at the outer regions of the main-belt at about 4 AU, and the Centaurs, which are objects that have orbits outside of Jupiter and inside of Neptune.
2009), which keeps track of reported lightcurve periods. For example, as of 2015 September, there were only 92 Hildas with a reliably established period. The Hildas are within reach of 22 2 Targets of Opportunity larger backyard telescopes under dark skies and longer exposures. I made the Hungaria asteroids a more than decade-long project. Maybe the Hildas or some other group will be your life-long project. 11 shows an asteroid with a period well under an hour. These are fun to catch, if you can, because over 4 h you’ll manage to get up to 10–15 cycles and so get an excellent period solution in just one night.
7 Semi-Regular Variables These stars can’t make up their minds. They sometimes have a strong tendency towards being predictable but then often go astray. What periods can be assigned to them range from 20 to 1000 days. 5 magnitudes or less. The group, generally known as SR, is usually broken into several groups, SRA through SRD, and probably more; it depends on who’s doing the classifying. The SRA stars have periods longer than 35 days while the SRBs have less well-defined periods starting at 20 days.