{"id":2094,"date":"2019-08-07T06:03:10","date_gmt":"2019-08-07T11:03:10","guid":{"rendered":"https:\/\/sandislandobservatory.com\/\/?page_id=2094"},"modified":"2021-11-26T08:01:11","modified_gmt":"2021-11-26T14:01:11","slug":"formulas","status":"publish","type":"page","link":"https:\/\/sandislandobservatory.com\/resources\/formulas\/","title":{"rendered":"Formulas"},"content":{"rendered":"<p><!-- Create a table here --><\/p>\n<h5 style=\"padding-left:10px;color:black;\">Useful Astronomy Formulas<\/h5>\n<div style=\"padding-left:10px;\">\n<table style=\"width: 90%;\">\n<tr>\n<th style=\"background-color:#55f;\">Parameter<\/th>\n<th style=\"background-color:#55f;\">Formula<\/th>\n<\/tr>\n<tr>\n<th>Image Scale (arcsec\/pixel)<\/th>\n<th>(206.265 * Camera Pixel (um) * Camera Binning) \/ (Telescope Focal Length (mm) * Reducer)<\/th>\n<\/tr>\n<tr>\n<th>Sensor Width (mm)<\/th>\n<th>(Number Sensor Pixels Wide * Camera Pixel (um)) \/ (1000)<\/th>\n<\/tr>\n<tr>\n<th>Sensor Height (mm)<\/th>\n<th>(Number Sensor Pixels High * Camera Pixel (um)) \/ (1000)<\/th>\n<\/tr>\n<tr>\n<th>Image Circle (mm)<\/th>\n<th>Square Root of (Sensor Width * Sensor Width) + (Sensor Height * Sensor Height)<\/th>\n<\/tr>\n<tr>\n<th>Field Of View (arcmin)<\/th>\n<th>Width = Image Scale * Number Sensor Pixel Wide \/ 60<br \/>Height = Image Scale * Number Sensor Pixel High \/ 60)<\/th>\n<\/tr>\n<tr>\n<th>Focal Ratio<\/th>\n<th>Telescope Focal Length (mm) * Reducer \/ Telescope Aperture (mm)<\/th>\n<\/tr>\n<tr>\n<th>Optimum Pixel Size (um)<br \/>@ Wavelength(nm)<\/th>\n<th>Telescope Focal Length (mm) * Reducer * Wavelength (nm) \/ (Telescope Aperture (mm) * 2000)<br \/>NOTE: 10 Angstroms = 1 Nanometer<\/th>\n<\/tr>\n<tr>\n<th>Dawes Limit<\/th>\n<th>116 \/ Telescope Aperture (mm)<\/th>\n<\/tr>\n<tr>\n<th>Rayleight Limit<\/th>\n<th>138 \/ Telescope Aperture (mm)<\/th>\n<\/tr>\n<tr>\n<th>Limiting Magnitude<\/th>\n<th>7.7 + [ 5 * (Base 10 Log(Telescope Aperture (mm)\/10))]<\/th>\n<\/tr>\n<tr>\n<th>Telescope Light Gain<br \/>Compared to 7mm pupil<\/th>\n<th>(Telescope Aperture (mm) * Telescope Aperture (mm)) \/ (7 * 7)<\/th>\n<\/tr>\n<tr>\n<th>Seeing Scale<\/th>\n<th>Exceptional 0.17 to 0.50 arcsec\/pixel<br \/>\n        Good 0.33 to 1.00 arcsec\/pixel<br \/>\n        Okay 0.67 to 2.00 arcsec\/pixel<br \/>\n        Poor 1.33 to 2.50 arcsec\/pixel<br \/>\n        Very Poor 1.67 to 3.00 arcsec\/pixel\n    <\/th>\n<\/tr>\n<tr>\n<th>Telescope Light Gain<br \/>Compared to 7mm pupil<\/th>\n<th>(Telescope Aperture (mm) * Telescope Aperture (mm)) \/ (7 * 7)<\/th>\n<\/tr>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Useful Astronomy Formulas Parameter Formula Image Scale (arcsec\/pixel) (206.265 * Camera Pixel (um) * Camera Binning) \/ (Telescope Focal Length<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":125,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/sandislandobservatory.com\/wp-json\/wp\/v2\/pages\/2094"}],"collection":[{"href":"https:\/\/sandislandobservatory.com\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sandislandobservatory.com\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sandislandobservatory.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sandislandobservatory.com\/wp-json\/wp\/v2\/comments?post=2094"}],"version-history":[{"count":0,"href":"https:\/\/sandislandobservatory.com\/wp-json\/wp\/v2\/pages\/2094\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/sandislandobservatory.com\/wp-json\/wp\/v2\/pages\/125"}],"wp:attachment":[{"href":"https:\/\/sandislandobservatory.com\/wp-json\/wp\/v2\/media?parent=2094"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}