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 » Online Classroom   » Emergency Navigation   » Public Discussion of Emergency Navigation   » Photo lunar practice

Author Topic: Photo lunar practice
 David Burch posted December 29, 2006 10:23 PM                   Here are some pictures to practice with. All from Steve Miller and all from the same location of 27° 12.2' N, 80° 13.4' W.Note that some of these are not very good for lunar analysis as the bodies are not lined up in their direction of maximum separation speed, which is probably (?) near when in line with perpendicular bisector of the horns. Note we calculate and output this speed compared to optimum speed in the StarPilot program, so this can be checked.Also we need to double check on the times with Steve.... even in these cases however we can see how well we get the bearing separation and the height separation... we need to assume the (missing) horizon is parallel to the bottom of the page.Ex1. Moon-VenusEX2. Jupiter-Moon-VenusEX3. Jupiter-MoonEx4.Saturn-MoonEx5. Mercury-moonEx6. Moon-Mars-PlieadesIn the Ex 6 on the moon-mars pleiades pic, are we seeing earth shine and if so, are we best then to judge the scale by the diameter of the earth shine and not the larger moon image? we can of course test this by seeing that we get the right bearing separations and height separations... and maybe with three like this we can even figure out if the horizon is parallel or not since we can rotate it mathematically to get the relative heights right.Do you have a time on the beautiful jupiter moon venus pic? From: Starpath, Seattle, WA
 Capt Steve Miller posted December 30, 2006 09:42 AM                   You should not assume that the horizon is parallel with the bottom of the image.I have used my Astronomical SKY program to extract the following information: The times are from the original image data from the camera.EX1 - 4 December 2005 image. This is from a video clip that was no more than 15 sec long(there were 450 frames involved) at this point I cannot determine with any accuracy whet the seconds are as the time stamp disapears during the processing. So the best I can do on the time is 18:09:00. The Moon's dia is 32'31", Venus dia is 38" They are separated by 3°19'23". Moon alt is 23°33'33", Venus alt is 23°56'48".EX2 - 8 August 2005 image. Time of image is 20:35:41.2, Moon dia is 29'49", Jupiter dia is 33", Venus dia is 13". The altitudes are Jupiter 30°10'52", Moon 20°43'06", Venus 15°45'53". The separations are Jupiter-Moon 15°49'41" and Moon-Venus 8°20'27".EX3 - 15 June 2005 Time of image 20:44:37.1, Moon dia 30'52", separation 3°01'19". Jupiter altitude is 59°35'25", Moon alt is 55°02'13".EX4 - 6 April 2006 time of image 21:39:22, Moon dia 29'43", separation is 3°43'21". Saturn Alt is 76°05'50", Moon alt is 78°40'18".EX5 - 11 March 2005 time of image 19:07:00 (best estimate). Moon dia 31' 59", Mars dia 7", separation 3°38'21". Moon alt is 10°45'36", Mars alt is 8°41'47".EX6 - 5 MArch 2006 time of image 19:24:09, Moon dia is 31'06", Mars dia is 7", separation is 4°19'44". Moon alt is 65°33'00", Mars alt is 68°42'44". Use the Earthshine ti work with the Moon dia as the illuminated side of the Moon is extremely over exposed (to get Earthshine and stars/planet), thus is very distorted and NO GOOD for measuring information.NOTE: All altitudes and separations are to the CENTER of the Body.Hopefully the information on the altitudes will be enough to reasonably acurately place the horizon with the Bodies.Capt Steve Miller From: Starpath
 David Burch posted December 30, 2006 05:31 PM                   Are the times all GMT or local time, and if local what time zone for each, ie daylight or not etc. One of the pics has the time listed as "LT" and it is the same as you list hereDo you have the SKY output for the moon jupiter sample we have analyzed? It would be interesting to see what they show for the "separation" compared to what we are calling "lunar distances," which include some refraction corrections. thanks. is there a definition of this "separation" somewhere, or is it just the computed center to center with no corrections, same as you would get from a simple great circle computation between the two GPs? From: Starpath, Seattle, WA
 Capt Steve Miller posted July 22, 2008 06:47 PM                   The times are all Local Time and the zone is 5 for non DST and 4 during DST.The data supplied in my last post is all from The Sky astronomical program that I use. I believe that the separation distance is center to center without corrections for paralax or refraction. From: Starpath

 All times are Pacific