2006-05-22 TCS3 Engineering - Pointing RUN.
When: 2006.05.22 Who: Tony D, with Dave G (operator). What: We are using tcs1 to run the telescope, but recording tpoint data via tcs3. 1. Benchmark 1 Datafile: benchmark1.dat 40 start, 16.5 degrees. Tony used "script bm1.txt" & 't3io info PT EN' to record tcs3 J2000 position. Taking start data from 'benchmark1.dat' and compare it to the J2000 position in 'bm1.txt', this should tell how we the current map is working. Tcs3 has these pointing coefficients: pt.Coeff.set ih 1.9678 pt.Coeff.set id 283.7763 pt.Coeff.set np -2.4030 pt.Coeff.set ch 32.0879 pt.Coeff.set me 9.1052 pt.Coeff.set ma 35.2148 pt.Coeff.set hces 78.9693 pt.Coeff.set dces 16.6634 pt.Coeff.set fo 6.1292 pt.Coeff.set tf 17.6157 pt.Coeff.set tx -31.5272 Created bm1_fix.txt and used bm to create bm1_diff.dat > bm bm1_fix.txt > bm1_diff.dat bm1_diff.dat compares the FK5 position VS. the tcs3 J2000 position. links: bm1.txt bm1_fix.txt bm1_diff.dat 2. Collect Pointing Data sep=9.00 nstars=150 Datafile: pointing.dat 150 start, 9.0 degrees. Pointing coefficients produced by tpoint are: coeff change value sigma 1 IH -839.169 -839.17 2803.033 2 ID +1713.604 +1713.60 2402.851 3 NP +181.646 +181.65 1240.365 4 CH +570.116 +570.12 2709.459 5 ME -1752.824 -1752.82 1556.871 6 MA +613.992 +613.99 436.128 7 HCES -4398.481 -4398.48 3118.147 8 DCES -4403.890 -4403.89 2874.522 9 FO +1267.933 +1267.93 1780.781 10 TF +5052.055 +5052.05 3386.788 11 TX -179.438 -179.44 1269.210 Sky RMS =3048.94 Popn SD =3172.52 * something wrong with data. Will look at tomorrow. 3. benchmark 2 Datafile: benchmark2.dat 40 start, 16.5 degrees. Tony used "script bm2.txt" & 't3io info PT' Since the pointing data is bad, I will use the benchmark 1 data set with tpoint to cal the following coeff. and input the set into the tcs. pt.Coeff.set ih -194.79 pt.Coeff.set id -156.50 pt.Coeff.set np 0.29 pt.Coeff.set ch 23.44 pt.Coeff.set me 16.77 pt.Coeff.set ma 34.79 pt.Coeff.set hces 65.03 pt.Coeff.set dces 18.00 pt.Coeff.set fo 26.01 pt.Coeff.set tf -40.30 pt.Coeff.set tx -12.06 Collected data for benchmark2 stars: Created bm2_fix.txt and used bm to create bm2_diff.dat > bm bm2_fix.txt > bm2_diff.dat bm2_diff.dat compares the FK5 position VS. the tcs3 J2000 position. links: bm2.txt bm2_fix.txt bm2_diff.dat 4. Conclusion Here is a graph comparing bm1_diff.dat & bm2_diff.dat. graph1.pdf New coeff seem to work better! The next day I found a bad data point in the pointing file. Removed the point and used tpoint to recalculate the pointing map pointing.dat.bad - original file. pointing.dat - file with bad point removed. Tpoint produced: coeff change value sigma 1 IH -220.246 -220.25 14.541 2 ID -107.345 -107.35 12.504 3 NP +4.239 +4.24 6.434 4 CH +13.080 +13.08 14.046 5 ME +10.991 +10.99 8.132 6 MA +39.063 +39.06 2.269 7 HCES +44.083 +44.08 16.392 8 DCES -6.758 -6.76 15.089 9 FO +3.132 +3.13 9.219 10 TF +9.599 +9.60 17.701 11 TX -34.572 -34.57 6.569 Sky RMS = 15.75 Popn SD = 16.40 There is the tpoint graphs for the fit: pointing.pdf I will used the above pointing coefficient in the tcs3. 5. Suggestions: Message after last star - "That's the last star" or indicate ( % done? ). Add to documentation: At Zenith, Re-initialize position from APES. on pointing file, aux data can be RA DEC of Mean J2000 in radians (to compare to col 1 & 2 ).