TPTCSPNT_070410: April 10, 2007 midnight to 7AM
Goals:
- Half-power scans at Ku band to validate the dynamical model of inclinometers and accelerometers and how well they measure mechanical motions that affect astronomical pointing
- All-sky X-band pointing
Observing log
- average winds ranged from 0.37 to 0.89 m/s
Configure Ku band (14.00 GHz), observe 3C279 (1256-0547)
3-7 peak/focus on 3C279
8 30 sec track, az offset= +0.5*hpbw, hpbw = 53" 2007_04_10_04:17:19.fits
9 " , el offset= +0.5hpbw 2007_04_10_04:17:59.fits
10 30 sec track, no offset 2007_04_10_04:23:10.fits
11 " , az offset= +0.5hpbw 2007_04_10_04:23:50.fits
12 " , el offset= +0.5hpbw 2007_04_10_04:24:30.fits
13 30 sec track, no offset (power = 5.04 x10^4) 2007_04_10_04:27:13.fits
14 30 sec track, 0.5 degree off (power = 2.3 x10^4) 2007_04_10_04:28:01.fits
15 " , az offset= +0.5hpbw (pwr ~ 3.5 ) 2007_04_10_04:28:50.fits
16 " , el offset= +0.5hpbw (pwr ~ 3.8 2007_04_10_04:29:31.fits
17 30 sec track, no offset (pwr ~ 4.98) 2007_04_10_04:37:06.fits
18 " , az offset= +0.4 hpbw (pwr ~ 4.1 ) 2007_04_10_04:37:47.fits
19 " , az offset= +0.5 hpbw (pwr ~ 3.65 2007_04_10_04:38:27.fits
20 " , az offset= +0.6 hpbw (pwr ~ 3.25 ), 8500cts=10.6arcsec, or about 800cts/arcsec,
2007_04_10_04:39:07.fits
21 " , el offset= +0.4 hpbw (pwr ~ 4.25 ) 2007_04_10_04:39:47.fits
22 " , el offset= +0.5 hpbw (pwr ~ 3.8) 2007_04_10_04:40:27.fits
23 " , el offset= +0.6 hpbw (pwr ~ 3.4 ) 2007_04_10_04:41:07.fits
24-28 peak/focus
29 20-minute scan at az offset = 0.5hpbw, after removing a 2nd order baseline, the rms = 1.1"
2007_04_10_04:54:55.fits az_start = 176.85 el_start=45.70
az_end = 184.00 el_end =45.67
wind1: 0.98(0.44) wind2: 1.04(0.46) wind3: 0.65(0.28) dir1: 227(29) dir2: -33(30)
windavg = 0.89 m/s
30-34 peak/focus
35 20-minute scan at el offset = 0.5hpbw
2007_04_10_05:20:14.fits, after removing a 2nd order baseline, rms = 0.94"
az_start = 185.89 el_start = 45.58
az_end = 192.91 el_end = 44.94 Fred sees mainly a 0.45 Hz oscillation
wind1: 1.03(0.73) wind2: 0.92(0.33) wind3: 0.47(0.17) dir1: 223(20) dir2: -24(32)
windavg = 0.81 m/s
36-40 peak/focus
41 20-minute scan at az offset = 0.5hpbw 2007_04_10_05:45:35.fits
az_start = 194.76 el_start = 44.69
az_end = 201.49 el_end = 43.47
wind1: 1.37(0.55) wind2: 1.13(0.65) wind3: 0.17(0.16) dir1: -1.5(58) dir2: 64(99)
windavg = 0.89 m/s
42-46 peak/focus
47 20-minute scan at el offset = 0.5hpbw 2007_04_10_06:10:56.fits
az_start = 203.24 el_start = 43.07
az_end = 209.55 el_end = 41.32
wind1: 0.58(0.32) wind2: 0.34(0.33) wind3:0.18(0.16) dir1: 22(30) dir2: 158(55)
windavg = 0.37 m/s
Change to X-band (9.00GHz)
48 all-sky pointing
59 interrupted after scan 59 to fix a bug in the script
last scan was 259.
Jack scans are scans 48 through 259.
Preliminary Analysis
----------------------
Forward - Back differences ("hysteresis"):
deltaAZ = -0.79" (sigma= 0.13"); deltaEL = -2.07" (sigma= 0.17")
Plots of coverage, total corrections, and LPCs are attached.
-- ToddHunter - 10 Apr 2007
coverage.jpg 
pyr6.pdf