GNU/Linux man pages
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Syntaxe et mise en oeuvre :
Unix |
Unix v6 |
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azel(6) |
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azel satellite predictions [ ] [ ] satellite1 [ ] [ ] satellite2 ... predicts, in convenient form, the apparent trajectories of Earth satellites whose orbital elements are given in the argument files. If a given satellite name cannot be read, an attempt is made to find it in a directory of satellites maintained by the programs’s author. The option causes to ask for a date and read line 1 data (see below) from the standard input. The option causes to ask for the observer’s latitude, west-longitude, and height above sea level. For each satellite given the program types its full name, the date, and a sequence of lines each containing a time, an azimuth, an elevation, a distance, and a visual magnitude. Each such line indicates that: at the indicated time, the satellite may be seen from Murray Hill (or provided location) at the indicated azimuth and elevation, and that its distance and apparent magnitude are as given. Predictions are printed only when the sky is dark (sun more than 5 degrees below the horizon) and when the satellite is not eclipsed by the earth’s shadow. Satellites which have not been seen and verified will not have had their visual magnitude level set correctly. All times input and output by are GMT (Universal Time). The satellites for which elements are maintained are: sla,b,e,f,k Skylab A through Skylab K. Skylab A is the laboratory; B was the rocket but it has crashed. A and probably K have been verified. cop Copernicus I. Never verified. oao Orbiting Astronomical Observatory. Seen and verified. pag Pageos I. Seen and verified; fairly dim (typically 2nd-3rd magnitude), but elements are extremely accurate. exp19 Explorer 19; seen and verified, but quite dim (4th-5th magnitude) and fast-moving. c103b, c156b, c184b, c206b, c220b, c461b, c500b
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Various of the USSR Cosmos series; none seen. 7276a |
Unnamed (satellite # 72-76A); not seen. The element files used by contain five lines. The first line gives a year, month number, day, hour, and minute at which the program begins its consideration of the satellite, followed by a number of minutes and an interval in minutes. If the year, month, and day are 0, they are taken to be the current date (taken to change at 6 A.M. local time). The output report starts at the indicated epoch and prints the position of the satellite for the indicated number of minutes at times separated by the indicated interval. This line is ended by two numbers which specify options to the program governing the completeness of the report; they are ordinarily both ‘‘1’’. The first option flag suppresses output when the sky is not dark; the second supresses output when the satellite is eclipsed by the earth’s shadow. The next line of an element file is the full name of the satellite. The next three are the elements themselves (including certain derivatives of the elements). /usr/jfo/el/* orbital element files sky (VI) J. F. Ossanna |
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azel(6) | |