2023 Oct 27 -  TCS3 Pointing Run (T.Denault, A.Seigel, D.Griep)

Goals
TCS3 pointing run. (1st half of night, Fri 10/27/2023, 18:35pm-23:55am)
Last one was done on 2023-05-27.

1. Encoder Measurement

* DID NOT: Asked DayCrew to clean/inspect gears/encoders/tachometer. 
Did encoder measurement on 10/26. Will not use new encoder values, possible bad 
data point, should redo measuremnt next week. See: 
http://irtfweb.ifa.hawaii.edu/~tcs3/tcs3/data/encoders/ 

2. Setup. How is the tcs servo performance?

Tracking is OK. Following error range is HA 0.146, Dec 0.056. 
231007-tcs_mcc_graph1.png (Best I saw was 0.120, 0.023)

- Collimate and balance are set. Hexapod is used.
- Spex is in the center. 
Sunset at 5:48

3. Benchmark current TCS

Start at 18:50
Using current TCS version v230508.
Pattern: benchmark13

tpoint file:  b1.dat
.ape   file:  b1.ape

Done at 19:36. 30 min to take data.
(slow due to slow west slews, and slower dome speed).

4. Pointing Run

Using TCS to new version v230508 (no changes, using same encoder ratios).

Starting at 19:30 with a GRID w/ 70 stars
Done taking data at 21:00 .. about 1hr 30 min.

tpoint file:  point.dat
.ape   file:  point.ape

used all data, RMS =  20.75  
Removed #1,    RMS =  19.75
Removed #6,    RMS =  18.98
Removed #6,    RMS =  17.98
Removed #18,   RMS =  16.12
Removed  #5,   RMS =  15.40
Removed #10,   RMS =  14.94

Orginial data file is:  point.dat.org

tpoint.log - log of fit using point-adj.dat
point.ps
point.pdf - tpoint graphs (postscript and PDF)
point_coeff.txt - resulting coefficients.

Updated .tcs-init with new coefficients
# coefficients from 2023/10/27 pointing run:
IH        +42.3626 
ID       -320.9506 
NP        -10.8671 
CH        +38.0279 
ME        +29.0215
MA        +20.2528     
HCES     +298.9111    
HCEC      -59.3747    
DCES     -380.3595    
DCEC      +67.4515    
FO        +26.9508    
TF       -127.4869    
TX        -15.1389 

5. B2 benchmark 

Doing benchmark "b2" with new coefficients
Started at 21:50... finished at 22:25 (35 mins)
tpoint file:  b2.dat
.ape   file:  b2.ape

Now, let's compare the 2 benchmarks:

   Here is a graph of HA error of b1.dat vs b2.dat
   
   gnuplot to make the graphs:
       plot   'b1.ape' using 10 with linespoints  title 'b1 HA pt.madj'
       replot 'b2.ape' using 10 with linespoints  title 'b2 HA pt.madj'

   Here is a graph of DEC error of b1.dat vs b2.dat
   
   gnuplot to make the graphs:
      plot   'b1.ape' using 11 with linespoints  title 'b1 Dec pt.madj'
      replot 'b2.ape' using 11 with linespoints  title 'b2 Dec pt.madj'
   
Finished at 22:30.

6. Conclusion 

Point run when well. Most stars during b1 East West fell off screen. b2 was better.

Will use new coefficients, which should work better than the old ones.
   HA  big improvement in the benchmark graph.
   DEC shape is the same, slightly worse offset error.


2023-11-02: Re-did encoder ratios today (remotely from Hilo): http://irtfweb.ifa.hawaii.edu/~tcs3/tcs3/data/encoders/