By Brian D. Warner
Tools for beginner astronomers who desire to transcend CCD imaging and step into ‘serious’ technological know-how. The textual content bargains strategies for amassing, examining, and publishing info, and describes joint tasks during which amateurs and scholars can participate. Readers learn how to realize and keep away from universal error in amassing photometry facts, with targeted examples for research. contains experiences of accessible software program, with monitor photographs and worthwhile tips.
Read Online or Download A Practical Guide to Lightcurve Photometry and Analysis (The Patrick Moore Practical Astronomy Series) PDF
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Extra resources for A Practical Guide to Lightcurve Photometry and Analysis (The Patrick Moore Practical Astronomy Series)
However, with the automation equipment and software available these days, it would not be difficult to take measurements of some LPVs every week or so as you concentrate on other targets. Of particular interest is to follow the stars using more than one filter so that you can see if and how the color or temperature and lightcurve shape and/or amplitude changes over time. For what it’s worth, there are indications that LPVs also show “flickering”, very short period, irregular variations. , very little or no delay between images that are just long enough to get a signal-to-noise ratio (SNR; see Sect.
For many years, it was believed that planetary encounters were a primary mechanism for the formation of small binary asteroids. It’s now believed that YORP is the dominant, if not almost exclusive, cause. As a rubble-pile asteroid spins up, it reaches a point where it sheds mass, just like a person on a merry-go-round is eventually tossed off if it spins fast enough. The discarded material takes several paths. One is landing back on the asteroid’s equator to form an equatorial bulge. Another is for the material to join together and form a small moon.
Another dominant bias is against low amplitude asteroids. This is probably because they are nearly spheroidal. They are a round red potato instead of an elongated baking potato. 10 shows the very strong bias for large amplitude objects introduced by the addition of results for more than 10,000 asteroids from two professional surveys. These collected what I’ll call sparse dense lightcurves, or about 50–100 data points spread over a week or so. In theory, this can be, and was, sufficient to obtain a reliable period for a large number of the lightcurves analyzed.