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 Notes - Session 240 (2007-12-07)

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Bullet TPoint Mapping Run (2007-12-07)
 
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Goto Images from 2007-12-07

TPoint Mapping Run (2007-12-07)

A TPoint mapping run was conducted comprising 81 mapped points, using an automated script  (Time to complete xx minutes).

Raw Points - RMS  7.7 arc min (460 arc secs )
Image
# Term Value Sigma S/N
 
 

 
 

TPoint fit (2 terms) - RMS 7.0 arc min (420 arc secs)
Image
# Term Value Sigma S/N
1 IH 58.2 56.6 1.0
2 ID -180.1 46.8 3.9

 

2 terms :
- Index Error HA, 
- Index Error Dec
 

TPoint fit (6 terms) - RMS 5.6 arc mins (335 arc secs)
Image
# Term Value Sigma S/N
1 IH -503.5 506.9 1.0
2 ID -97.9 49.4 2.0
3 NP -314.5 297.0 1.1
4 CH 664.1 538.9 1.2
5 ME -235.9 56.2 4.2
6 MA 254.1 52.8 4.8

 

6 basic (equatorial) terms

 
************* AZIMUTH ************
MA: +254 seconds (+4.2 minutes).
Rotate axis West (counterclockwise).
For latitude 57.32°, the azimuth adjustment is 7.8 minutes.
Sigma=52.764

************* ALTITUDE ************
ME: -237 seconds (-3.9 minutes).
The polar axis should be lowered -237 seconds (-3.9 minutes).
Sigma=56.244

TPoint fit (7 terms) - RMS 5.1 arc mins (303 arc secs)

Including Fork Flexure (but not Tube Flexure)
(1 anomalous point removed)
Image
# Term Value Sigma S/N
1 IH -511.8 462.1 1.1
2 ID -193.7 50.4 3.8
3 NP -263.7 269.7 1.0
4 CH 680.5 491.1 1.4
5 ME -502.4 91.3 5.5
6 MA 297.4 49.1 6.1
7 FO 410.9 111.6 3.7

7 terms:
6 basic (equatorial) terms 
1 flexure term
************* AZIMUTH ************
MA: +297 seconds (+5.0 minutes).
Rotate axis West (counterclockwise).
For latitude 57.32°, the azimuth adjustment is 9.2 minutes.
Sigma=49.125

************* ALTITUDE ************
ME: -503 seconds (-8.4 minutes).
The polar axis should be lowered -503 seconds (-8.4 minutes).
Sigma=91.337

TPoint fit (7 terms) - RMS 2.7 arc mins (159 arc secs)

Including Tube Flexure  (but not Fork Flexure)
(1 anomalous point removed)
Image
# Term Value Sigma S/N
1 IH -194.3 242.5 0.8
2 ID -771.9 47.1 16.4
3 NP -155.8 141.5 1.1
4 CH 405.3 257.5 1.6
5 ME 60.3 32.4 1.9
6 MA 300.4 25.6 11.7
7 TF -836.9 51.7 16.2

7 terms:
6 basic (equatorial) terms 
1 flexure term
************* AZIMUTH ************
MA: +301 seconds (+5.0 minutes).
Rotate axis West (counterclockwise).
For latitude 57.32°, the azimuth adjustment is 9.3 minutes.
Sigma=25.578

************* ALTITUDE ************
ME: +59 seconds (+1.0 minutes).
The polar axis should be raised +59 seconds (+1.0 minutes).
Sigma=32.409

TPoint fit (8 terms) - RMS 2.4 arc mins (146 arc secs)

Significant improvement in S/N after
 including Fork and Tube Flexure and 
removing 1 anomalous point 
Image
# Term Value Sigma S/N
1 IH -116.2 223.3 0.5
2 ID -833.3 45.9 18.1
3 NP -151.9 129.7 1.2
4 CH 330.7 236.9 1.4
5 ME 286.6 65.2 4.4
6 MA 290.1 23.6 12.3
7 TF -979.0 59.8 16.4
8 FO -263.8 67.6 3.9

8 terms:
6 basic (equatorial) terms 
2 flexure terms
************* AZIMUTH ************
MA: +291 seconds (+4.9 minutes).
Rotate axis West (counterclockwise).
For latitude 57.32°, the azimuth adjustment is 9.0 minutes.
Sigma=23.599

************* ALTITUDE ************
ME: +287 seconds (+4.8 minutes).
The polar axis should be raised +287 seconds (+4.8 minutes).
Sigma=65.157

TPoint fit (12 terms) -  RMS 1.6 arc min (93 arc secs) 
Low RMS value but poorer S/N values on ME & MA
Image
# Term Value Sigma S/N
1 IH -368.4 151.8 2.4
2 ID -1410.5 243.2 5.8
3 NP -200.5 87.2 2.3
4 CH 555.4 159.2 3.5
5 ME 120.2 78.2 1.5
6 MA 361.4 30.6 11.8
7 TF -1545.1 198.1 7.8
8 FO 120.9 58.6 2.1
9 HHSH1 585.0 101.3 5.8
10 HDCH2 -88.5 19.5 4.5
11 HDSH1 -103.7 35.3 2.9
12 HDSD1 313.0 178.8 1.8

12 terms : 
6 basic (equatorial) terms 
2 flexure terms
4 harmonic terms

Corresponding Polar Alignment Information 
************* AZIMUTH ************
MA: +366 seconds (+6.1 minutes).
Rotate axis West (counterclockwise).
For latitude 57.32°, the azimuth adjustment is 11.3 minutes.
Sigma=30.635

************* ALTITUDE ************
ME: +115 seconds (+1.9 minutes).
The polar axis should be raised +115 seconds (+1.9 minutes).
Sigma=78.243

TPoint fit (12 terms) -  RMS 1.6 arc min (96 arc secs) 
(MA fixed based on 8 term solution)
Image
# Term Value Sigma S/N
1 IH -465.4 150.9 3.1
2 ID -1390.8 251.5 5.5
3 NP -265.1 85.5 3.1
4 CH 651.5 159.0 4.1
5 ME 128.3 80.9 1.6
6 MA 291.1
7 TF -1528.9 204.9 7.5
8 FO 106.2 60.3 1.8
9 HHSH1 573.8 104.7 5.5
10 HDCH2 -88.1 20.2 4.4
11 HDSH1 -32.2 18.2 1.8
12 HDSD1 298.6 185.0 1.6

12 terms : 
6 basic (equatorial) terms 
2 flexure terms
4 Harmonic terms

 
************* AZIMUTH ************
MA: +291 seconds (+4.9 minutes).
Rotate axis West (counterclockwise).
For latitude 57.32°, the azimuth adjustment is 9.0 minutes.
Sigma=7 

************* ALTITUDE ************
ME: +123 seconds (+2.1 minutes).
The polar axis should be raised +123 seconds (+2.1 minutes).
Sigma=80.932

  

TPoint fit (12 terms) -  RMS 1.6 arc min (98 arc secs) 
(MA/ME fixed based on 8 term solution)
Image
# Term Value Sigma S/N
1 IH -440.5 154.5 2.9
2 ID -1766.1 161.7 10.9
3 NP -262.9 87.9 3.0
4 CH 630.7 163.1 3.9
5 ME 286.5
6 MA 291.1
7 TF -1836.3 130.2 14.1
8 FO 74.5 59.6 1.2
9 HHSH1 680.4 90.6 7.5
10 HDCH2 -97.0 20.2 4.8
11 HDSD1 570.5 122.3 4.7
12 HDSH1 -32.8 18.7 1.8

12 terms : 
6 basic (equatorial) terms 
2 flexure terms
4 Harmonic terms

 
************* AZIMUTH ************
MA: +291 seconds (+4.9 minutes).
Rotate axis West (counterclockwise).
For latitude 57.32°, the azimuth adjustment is 9.0 minutes.
Sigma=7 

************* ALTITUDE ************
ME: +287 seconds (+4.8 minutes).
The polar axis should be raised +287 seconds (+4.8 minutes).
Sigma=6 

  

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