Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q1463544> ?p ?o }
Showing triples 1 to 47 of
47
with 100 triples per page.
- Q1463544 subject Q8793753.
- Q1463544 abstract "In astronomy, precovery (short for "pre-discovery recovery") is the process of finding the image of an object in old archived images or photographic plates for the purpose of calculating a more accurate orbit. This happens most often with minor planets, but sometimes a comet, a dwarf planet, a natural satellite, or a star is found in old archived images; even exoplanet precovery observations have been obtained. While the term "precovery" refers to a pre-discovery image, "recovery" refers to imaging of a body which was lost to our view (as behind the Sun), but is now visible again (also see lost minor planets).Calculating the orbit of an astronomical object involves measuring its position on multiple occasions. The more widely separated these are in time, the more accurately the orbit can be calculated. However, for a newly discovered object, only a few days' or weeks' worth of measured positions may be available, which is only sufficient for a preliminary (imprecise) orbit calculation.When an object is of particular interest (such as asteroids with a chance of impacting Earth), researchers begin a search for precovery images. Using the preliminary orbit calculation to predict where the object might appear on old archival images, those images (sometimes decades old) are searched to see if it had been in fact photographed already. If so, a far more precise orbital calculation can then be made.Until fast computers were widely available, it was impractical to analyze and measure images for possible minor planet discoveries because this involved a considerable amount of manual labor. Usually, such images were made years or decades earlier for other purposes (studies of galaxies, etc.), and it was not worth the time it took to look for precovery images of ordinary asteroids. Today, computers can easily analyze digital astronomical images and compare them to star catalogs containing up to a billion or so star positions to see if one of the "stars" is actually a precovery image of the newly discovered object. This technique has been used since the mid-1990s to determine the orbits of an enormous number of minor planets.".
- Q1463544 wikiPageExternalLink skymorph.html.
- Q1463544 wikiPageWikiLink Q1022867.
- Q1463544 wikiPageWikiLink Q10734.
- Q1463544 wikiPageWikiLink Q1138868.
- Q1463544 wikiPageWikiLink Q144505.
- Q1463544 wikiPageWikiLink Q150329.
- Q1463544 wikiPageWikiLink Q150802.
- Q1463544 wikiPageWikiLink Q15218309.
- Q1463544 wikiPageWikiLink Q15586.
- Q1463544 wikiPageWikiLink Q15591.
- Q1463544 wikiPageWikiLink Q15603.
- Q1463544 wikiPageWikiLink Q15606.
- Q1463544 wikiPageWikiLink Q15610.
- Q1463544 wikiPageWikiLink Q15611.
- Q1463544 wikiPageWikiLink Q16021.
- Q1463544 wikiPageWikiLink Q1645659.
- Q1463544 wikiPageWikiLink Q168419.
- Q1463544 wikiPageWikiLink Q2199.
- Q1463544 wikiPageWikiLink Q2384033.
- Q1463544 wikiPageWikiLink Q242388.
- Q1463544 wikiPageWikiLink Q2537.
- Q1463544 wikiPageWikiLink Q3002.
- Q1463544 wikiPageWikiLink Q307.
- Q1463544 wikiPageWikiLink Q318.
- Q1463544 wikiPageWikiLink Q324.
- Q1463544 wikiPageWikiLink Q332.
- Q1463544 wikiPageWikiLink Q333.
- Q1463544 wikiPageWikiLink Q339.
- Q1463544 wikiPageWikiLink Q3559.
- Q1463544 wikiPageWikiLink Q3863.
- Q1463544 wikiPageWikiLink Q4130.
- Q1463544 wikiPageWikiLink Q430297.
- Q1463544 wikiPageWikiLink Q44559.
- Q1463544 wikiPageWikiLink Q463796.
- Q1463544 wikiPageWikiLink Q523.
- Q1463544 wikiPageWikiLink Q5282013.
- Q1463544 wikiPageWikiLink Q601.
- Q1463544 wikiPageWikiLink Q604.
- Q1463544 wikiPageWikiLink Q611.
- Q1463544 wikiPageWikiLink Q6587.
- Q1463544 wikiPageWikiLink Q6684357.
- Q1463544 wikiPageWikiLink Q850950.
- Q1463544 wikiPageWikiLink Q8793753.
- Q1463544 comment "In astronomy, precovery (short for "pre-discovery recovery") is the process of finding the image of an object in old archived images or photographic plates for the purpose of calculating a more accurate orbit. This happens most often with minor planets, but sometimes a comet, a dwarf planet, a natural satellite, or a star is found in old archived images; even exoplanet precovery observations have been obtained.".
- Q1463544 label "Precovery".