Adam Ginsburg's blog

• Minor mystery resolved: Perseus cal curve

  When I started working on the Perseus data again, I decided to use the Enoch 2006 calibration curve directly. However, it has a very different form than all other epochs. The reason, as revealed below, is that it was not forced through 0,0. Additionally, all of the BGPS data was observed with mean DC ~ 2-3 V, while the Perseus data was observed with mean DC 4-5 V, so the relevant regime is in a very different location. The reference DC bias was much lower, ~2.15 V vs. 4.6 V in the 2005-2007 BGPS and 2.6 V in the 2009 BGPS.

  

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• planet fluxes

  ; ephemerides from the JCMT ; MARS: ; June 30 2005: 730.14 Jy UT:53551 ; July 15 2005: 872.83 Jy UT:53566 ; Sept 10 2005: 1941.72 Jy UT:53623 ; June 5 2006: 553.13 Jy UT:53891 ; June 23 2006: 674.14 Jy UT:53544 ; Sept 10 2006: 135.79 Jy UT:53896 ; July 20 2007: 381.18 Jy UT:54301 ; Sept 10 2007: 597.87 Jy UT:54353 ; ; URANUS: ; June 30 2005: 43.43 Jy UT:53551 ; July 15 2005: 44.35 Jy UT:53566 ; Sept 10 2005: 45.78 Jy UT:53623 ; June 5 2006: 41.71 Jy UT:53891 ; June 23 2006: 42.96 Jy UT:53544 ; Sept 10 2006: 41.62 Jy UT:53896 ; July 20 2007: 43.90 Jy UT:54301 ; Sept 10 2007: 45.57 Jy UT:54353 ; ; NEPTUNE: ; June 30 2005: 17.42 Jy UT:53551 ; July 15 2005: 17.58 Jy UT:53566 ; Sept 10 2005: 17.50 Jy UT:53623 ; June 5 2006: 17.04 Jy UT:53891 ; June 23 2006: 17.33 Jy UT:53544 ; Sept 10 2006: 17.09 Jy UT:53896 ; July 20 2007: 17.59 Jy UT:54301 ; Sept 10 2007: 17.56 Jy UT:54353

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• distortion mapping done?

  Created 'beam_locations_0707.txt' from uranus_070702_o42 with a few contributions from g34.3_070630_o34. The rest were created by averaging over all of the beam location files

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• 0707 distortion maps

  

  They're consistent but not very close to each other.

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• beam locations & peak fluxes

  The results of my distortion mapping work below. Note that, especially for 06, there are a LOT of cases where no beam locations correction (noBL) had a higher peak than the distortion corrected map. I have no explanation for this yet. More work to come...

  PEAK COMPARISON BL:       5.95824  noBL:       3.09836    uranus_050619_o23 PEAK COMPARISON BL:       3.93725  noBL:       2.85479    uranus_050619_o24 PEAK COMPARISON BL:       15.5613  noBL:       523.035    neptune_050626_o19 PEAK COMPARISON BL:       16.4601  noBL:       16.0038    neptune_050626_o20 PEAK COMPARISON BL:       426.671  noBL:       375.174    mars_050627_o31 PEAK COMPARISON BL:       415.968  noBL:       413.327    mars_050627_o32  PEAK COMPARISON BL:       15.2464  noBL:       33.8593    uranus_050628_o33 PEAK COMPARISON BL:       34.6631  noBL:       35.5086    uranus_050628_o34 PEAK COMPARISON BL:       164.832  noBL:       403.189    uranus_050904_o31 PEAK COMPARISON BL:       216.820  noBL:       425.613    uranus_050904_o32 PEAK COMPARISON BL:       134.972  noBL:       156.196    uranus_050911_ob8 PEAK COMPARISON BL:       11.0957  noBL:       11.1993    neptune_060602_o30 PEAK COMPARISON BL:       12.0000  noBL:       11.0947    neptune_060602_o31 PEAK COMPARISON BL:       2478.20  noBL:       2365.17    mars_060605_ob1 PEAK COMPARISON BL:       2144.68  noBL:       2147.18    mars_060605_ob2  PEAK COMPARISON BL:       17.7354  noBL:       25.7041    uranus_060621_o29 PEAK COMPARISON BL:       18.7889  noBL:       25.6599    uranus_060621_o30 PEAK COMPARISON BL:       28.1957  noBL:       31.1013    uranus_060625_o46 PEAK COMPARISON BL:       23.0236  noBL:       27.8556    uranus_060905_ob6 PEAK COMPARISON BL:       18.8731  noBL:       28.4964    uranus_060906_o12 PEAK COMPARISON BL:       23.3481  noBL:       29.8294    uranus_060908_o13 PEAK COMPARISON BL:       20.6238  noBL:       26.9424    uranus_060909_o12 PEAK COMPARISON BL:       21.1049  noBL:       28.8533    uranus_060910_o12 PEAK COMPARISON BL:       24.0231  noBL:       32.0877    uranus_060914_o10 PEAK COMPARISON BL:       23.2590  noBL:       33.3496    uranus_060914_o11 PEAK COMPARISON BL:       24.0538  noBL:       30.0552    uranus_060919_ob9 PEAK COMPARISON BL:       355.467  noBL:       669.416    g34.3_070630_o34 PEAK COMPARISON BL:       246.803  noBL:       296.252    g34.3_070630_o35 PEAK COMPARISON BL:       724.874  noBL:       807.152    uranus_070702_o42 PEAK COMPARISON BL:       7.60370  noBL:       9.02960    uranus_070912_o27 PEAK COMPARISON BL:       98.8058  noBL:       88.9957    mars_070913_o22 PEAK COMPARISON BL:       82.2708  noBL:       89.3476    mars_070913_o23
  

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• sign errors

  pinned down the problem. Was a minor sign error in the offsets. Why is it that simple sign errors are ALWAYS the hardest things to track down? Now, open question: should x,y scaling be free parameters or not? What I mean is, when I measure the positions of bolometers on the array using the planet map, should I allow the X and Y stretch (the bolometer spacing) to change? Should it be a uniform stretch in X and Y or should it be allowed to 'distort' too? My opinion is, none of the above: I'm measuring their actual positions (in terms of a fixed spacing) and therefore stretching or distorting to match the nominal positions is not necessary.

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• BL/noBL Mars

  Mars using uranus_070702_o42 distortion map:

  BL070706_o38_raw_ds1.nc_indiv0    134.8757324     -0.2325330      0.0721872   3282.5439453      2.0985703      2.1959550   3147.6682129      2.3311033      2.1237679BL070706_o39_raw_ds1.nc_indiv0    188.0588379     -0.0947621     -0.0643225   3782.3984375      2.1416662      1.9909470   3594.3395996      2.2364283      2.0552695BL070706_o40_raw_ds1.nc_indiv0    451.6955566     -0.0427303     -0.3303463   3461.9191895      2.1925442      2.0726480   3010.2236328      2.2352746      2.4029944BL070713_o36_raw_ds1.nc_indiv0    294.5898438     -0.2068889      0.0493107   5975.9482422      1.9935303      2.1527038   5681.3583984      2.2004192      2.1033931BL070713_o37_raw_ds1.nc_indiv0    813.5678711     -0.4597032      0.0361557   5515.4501953      2.0334179      2.1772604   4701.8823242      2.4931211      2.1411047BL070713_o38_raw_ds1.nc_indiv0    286.2934570     -0.1904230      0.0520797   5967.7011719      1.9853363      2.1624830   5681.4077148      2.1757593      2.1104033BL070713_o39_raw_ds1.nc_indiv0    773.2104492     -0.0816238     -0.3387871   5409.8344727      2.0317609      2.1736624   4636.6240234      2.1133847      2.5124495BL070714_o76_raw_ds1.nc_indiv0    244.2031250     -0.2079357      0.0572422   5312.0419922      1.9982606      2.1597764   5067.8388672      2.2061963      2.1025343BL070714_o77_raw_ds1.nc_indiv0    688.7365723     -0.1176772     -0.3138330   4706.1503906      2.0379941      2.1989338   4017.4138184      2.1556714      2.5127668BL070715_o45_raw_ds1.nc_indiv0    108.5583496     -0.0652246     -0.0818899   2397.9819336      2.1608708      1.9907858   2289.4235840      2.2260954      2.0726757BL070715_o46_raw_ds1.nc_indiv0    268.4321289     -0.2927990     -0.0692098   2236.4533691      2.1387808      2.0159581   1968.0212402      2.4315798      2.0851679BL070717_o47_raw_ds1.nc_indiv0    372.6528320     -0.2188239      0.0690587   7070.0649414      1.9820960      2.1670835   6697.4121094      2.2009199      2.0980248BL070717_o48_raw_ds1.nc_indiv0    498.4628906     -0.2993519      0.0410304   6636.1396484      2.0418782      2.1088474   6137.6767578      2.3412302      2.0678170BL070718_o41_raw_ds1.nc_indiv0    287.1591797     -0.2016468      0.0641356   6684.1699219      1.9891322      2.1470959   6397.0107422      2.1907790      2.0829604BL070718_o42_raw_ds1.nc_indiv0    841.6083984     -0.0809386     -0.3511798   5934.2832031      2.0332539      2.1427581   5092.6748047      2.1141925      2.4939380BL070725_o34_raw_ds1.nc_indiv0    245.6381836     -0.0810674     -0.0582435   5918.6728516      1.9807132      2.1547492   5673.0346680      2.0617807      2.2129927BL070725_o35_raw_ds1.nc_indiv0    697.7910156      0.1512802     -0.6174591   4873.1469727      2.3222449      2.0499101   4175.3559570      2.1709647      2.6673691BL070726_o33_raw_ds1.nc_indiv0    216.2124023     -0.0697458     -0.0627950   5056.3364258      2.1531394      1.9873902   4840.1240234      2.2228851      2.0501852BL070726_o34_raw_ds1.nc_indiv0    433.0415039     -0.0154374     -0.3017542   4586.9204102      2.1483676      2.0385454   4153.8789062      2.1638050      2.3402996BL070730_o23_raw_ds1.nc_indiv0    105.4489746      0.1025155     -0.2241490   2679.8452148      2.1567283      1.9786894   2574.3962402      2.0542128      2.2028384BL070730_o24_raw_ds1.nc_indiv0    440.7482910     -0.3968222     -0.0447321   2595.1044922      2.0618360      2.1782801   2154.3562012      2.4586582      2.2230122
  

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• distortion mapping

  Between sign errors, failures to fit, and.... I really don't know WHAT was going on, I finally figured out how to get the cursed distortion mapping to work. I still haven't even started testing, unfortunately. I don't know why I can fit the way the OP did, fitting R and Theta, and I apparently can't fit x,y. It's frustrating.

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