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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Algorithm for star ephemerides?
From: Andrés Ruiz
Date: 2001 Apr 20, 6:45 AM
From: Andrés Ruiz
Date: 2001 Apr 20, 6:45 AM
Here is an extract of the FK5 catalog available at ftp://adc.gsfc.nasa.gov/pub/adc/archives/catalogs/1/1149A/ FK5 Number RA RA RA PM RA Dec Dec Dec PM Dec h m s s/JC G M S 1 , 0 , 8 , 23.265 , 1.039 , 29 , 5 , 25.58 , -16.33 2 , 0 , 9 , 10.695 , 6.827 , 59 , 8 , 59.18 , -18.09 3 , 0 , 9 , 24.659 , 1.186 , -45 , 44 , 50.79 , -18.11 4 , 0 , 10 , 19.257 , 0.074 , 46 , 4 , 20.21 , 0.03 5 , 0 , 11 , 34.437 , 0.079 , -27 , 47 , 59.12 , 1.65 6 , 0 , 11 , 44.014 , 1.412 , -35 , 7 , 59.17 , 11.86 7 , 0 , 13 , 14.154 , 0.019 , 15 , 11 , 0.8 , -1.2 9 , 0 , 19 , 25.674 , -0.093 , -8 , 49 , 26.14 , -3.61 10 , 0 , 20 , 4.251 , 26.778 , -64 , 52 , 29.25 , 116.39 11 , 0 , 25 , 45.056 , 66.919 , -77 , 15 , 15.4 , 32.37 ... and the numbers for Navigational Stars are: navStars[numNavigationalStars] = { "Acamar" , 106 , "Achernar" , 54 , "Acrux" , 462 , "Adhara" , 268 , "Al Na'ir" , 829 , "Aldebaran" , 168 , "Alioth" , 483 , "Alkaid" , 509 , "Alnilam" , 210 , "Alphard" , 354 , "Alphecca" , 578 , "Alpheratz" , 1 , "Altair" , 745 , "Ankaa" , 12 , "Antares" , 616 , "Arcturus" , 526 , "Atria" , 625 , "Avior" , 315 , "Bellatrix" , 201 , "Betelgeuse" , 224 , "Canopus" , 245 , "Capella" , 193 , "Deneb" , 777 , "Denebola" , 444 , "Diphda" , 22 , "Dubhe" , 417 , "Elnath" , 202 , "Eltanin" , 676 , "Enif" , 815 , "Fomalhaut" , 867 , "Gacrux" , 468 , "Gienah" , 457 , "Hadar" , 518 , "Hamal" , 74 , "Kaus Aust." , 689 , "Kochab" , 550 , "Markab" , 871 , "Menkar" , 107 , "Menkent" , 520 , "Miaplacidus" , 348 , "Mirfak" , 120 , "Nunki" , 706 , "Peacock" , 764 , "Polaris" , 907 , "Pollux" , 295 , "Procyon" , 291 , "Rasalhague" , 656 , "Regulus" , 380 , "Rigel" , 194 , "Rigil Kent." , 538 , "Sabik" , -1 , "Schedar" , 21 , "Shaula" , 652 , "Sirius" , 257 , "Spica" , 498 , "Suhail" , 345 , "Vega" , 699 , "Zuben'ubi" , 548 }; >From Epoch J2000, you must add the Proper Motion, Nutation, and Aberration of the star to calculate the RA and Dec of the star, as Astronomical Algorithms. by Jean Meeus, 2 Ed edition (December 1998). ISBN: 0943396638 said. Andr�s Ruiz http://www.geocities.com/andresruizgonzalez/ Marine Navigation e-mail: aruiz@orona.es