Describe NK2013_Jun13 here.

Back to list of day to day logbook of observations

2013-06-13

Opacity is measured with the new taumeter at 225 GHz

For start:

Set pointing : 0, 0

NEW and definitive pointing model determined from yesterday

Set Focus : -1 mm

At 12:50 the NCS process that control the adjustment of the M2 focus depending on the temperature gradient stopped without anybody noticing it (no alarm); this had no effect until the evening since the outside temperature was stable, but after sunset we lost about ~10 degrees in ~2 hours. Up to scan 178 everything was OK, but after integration on a faint source at scan 199 we found huge beams, we spent a significant time on various focus before figuring out that we had to move M2 by more than 3mm before finding again reasonable beams ! Such a big change of focus is very unusual, that's how we figured out the problem.

Scan

UT

Source

Command

Az

El

Pointing X, Y, Focus

Tau225

Found

Comment

123

10h05

Mars

Track

133

69

0, 0, -2.4

0.84

tuning the KIDs, checking file transfer

124

10h10

Mars

Track

133

69

0, 0, -2.4

0.84

125

10h19

Mars

Track

133

69

0, 0, -1

0.84

126

10h23

Mars

Track

139

71

0, 0, -1

0.84

127

10h26

Mars

cross

141

71

0, 0, -1

1.16

2mm -3 0

128

10h32

Mars

pointliss

-3, 0, -1

1.16

1 and 2mm -7 3

129

10h38

Mars

cross

149

73

-7, 3, -1

1.16

2mm -4,4 Map:-6,3

130

10h42

Mars

pointliss

152

73

-7, 3, -1

0.938

-2,2;-2,3

131

10h46

Mars

pointliss

154

73

-2, 3, -1

0.938

-5,-2;-5,-1

132

10h50

Mars

pointliss

-5, -1, -1

0.579

-8,6

sky is cloudy and noisy

133

10h56

Mars

pointliss

163

74

-8, +6, -1

0.739

-5,-2;-5,-1

pointing keeps changing

134

11h01

Mars

faintliss

167

74

-5, -1, -1

1.09

-6,2;-6,2 Fwhm 16.7,20

PSF spread is large

135

11h09

Mars

pointliss

174

75

-6, +2, -1

1.09

-5,2;-5,2 Fwhm 15,19

136

11h16

Mars

pointliss

180

75

-6, +2, -1

1.09

-7,2;-6,2 Fwhm 16,20

137

11h20

Mars

focusp2

184

75

-6, +2, -1

4?!

-0.1?;-0.75

focus +-2mm Sky unstable at 1mmm

138

11h45

Mars

otfgeom

205

73

-6, +2, -1

-7,4;-7,4 Fwhm 14.5 19.5

for lunch

139

11h45

Mars

otfgeom

205

73

-6, +2, -1

cancelled. Scan never started.

140

12h20

Mars

otfgeom

231

68

-6, +2, -1

stopped in the middle. Block in antenna

141

12h48

Mars

otfgeom

231

68

-6, +2, -1

cancel

142

13h03

Mars

track

244

62

-6, +2, -1

143

13h10

Mars

otfgeom

246

61

-6, +2, -1

many clouds resonances lost in the middle

144

13h39

Mars

track

253

55

-6, +2, -1

resonances found by Nello

145

13h41

Mars

pointliss

254

55

-6, +2, -1

0,9;-1,11 but uncertain

146

13h44

Mars

pointliss

254

55

-2, +10, -1

0.841

-8,4 ?

147

13h49

Mars

pointliss

256

54

-2, +10, -1

-8,2;-9,2

Went off resonance, sky so fluctuating

148

14h04

Mars

pointliss

256

54

-9, +2, -1

-9,1;-9,1

lots of resonances lost

149

14h08

Higelev

track

179.7

79.9

-9, +2, -1

Go to a stall position HO 180 80 and wait for an hour

14h20

Higelev

nothing

179.7

79.9

-9, +2, -1

resonances OK, >14h42 no tuning

150

16h32

3C279

track

123

28

-9, +2, -1

resuming observations, sky a bit clearer

151

16h32

3C279

pointliss

-9, +2, -1

-8 0; -8 -1

not too far

152

16h37

3C279

pointliss

-8, 0, -1

-8 2; -8 0

ok

153

16h42

3C279

cross

-8, 0, -1

0.932

map -9 3;-9 1, X -9 2; -7 0 Fl 8,12Jy

ok

154

16h47

3C279

faintliss

-8, 0, -1

0.84

-9 0;-10 1

155

16h55

3C279

focusp2

-9, 0, -1

-2?,-1~

+-2mm

156-160

16h58

3C279

focusliss

-9, 0, -1

0.914

-1.6 best trade-off

-1,-1.6,-2.2,-0.4,0.2

161

17h12

3C279

pointliss

-9, 0, -1.6

-8 -1;-8 -1 Fw15.7;19.8 Fl 11,12Jy

162

17h16

3C279

otfgeom

-8, -1, -1.6

0.892

cloudy but reso not lost

163

17h27

3C279

faintliss

137

37

-8, -1, -1.6

0.860

-5 0;-5 0 Fw16.8,20 Fl 10,18Jy

164

17h39

IRC10216

track

-5, 0, -1.6

165

17h40

IRC10216

pointliss

-5, 0, -1.6

-6 2;-5 1 FW25arcsec,Fl 3.6,0.7Jy

Extended?

166

17h43

IRC10216

faintliss

-5, +1, -1.6

-6 3;-7 2 Fw22,26 Fl4,0.7Jy

167

17h49

IRC10216

faintliss

-5, +1, -1.6

-5 2;-5 2

168

17h56

M82

track

347

56

-5, +1, -1.6

169

18h01

M82

pointliss

347

55

-5, +1, -1.6

0.829

look ok

170

18h03

M82

faintliss

347

55

-5, +1, -1.6

0.810

171

18h10

M82

faintliss

345

55

-5, +1, -1.6

0.894

fl1.2,0.5Jy

172-173

18h17

M82

otf3x3

345

55

-5, +1, -1.6

0.840

Az and El 3x3 arcmin scans

174

18h30

M87

track

154

63

-5, +1, -1.6

0.894

Readout Box rebooted

175

18h49

M87

faintliss

164

64

-5, +1, -1.6

all right

176

18h55

0923+392

track

285

58

-5, +1, -1.6

0.822

177

19h01

0923+392

pointliss

285

58

-5, +1, -1.6

-5,+2; -4,+2

178

19h03

0923+392

faintliss

286

56

-4, +2, -1.6

-6,+2; -6,+2, Fw13.6,17.3arcs,Fl6.3,5.5Jy

179

19h08

HLS091828

track

308

54

-6, +2, -1.6

180-181

19h13

HLS091828

faintlisst

308

54

faintliss followed by a track to tune resonances

182-183

19h17

HLS091828

faintlisst

308

53

detected at 1 and 2mm

184-185

19h24

HLS091828

faintlisst

308

52

186-187

19h30

HLS091828

faintlisst

308

51

188-189

19h36

HLS091828

faintlisst

308

50

190-191

19h42

HLS091828

faintlisst

308

49

192-193

19h50

HLS091828

faintlisst

308

48

194-195

19h59

HLS091828

faintlisst

308

47

196-197

HLS091828

faintlisst

308

47

198

20h11

0923+392

track

291

43

-6 -2 -1.6

0.659

199

20h11

0923+392

faintliss

291

43

-6 -2 -1.6

0.659

-7,2;-7,0 Fw23,19 Fl2.3,4.1Jy

200-203

20h18

DIY

skydip scan 202

291

-6 -2 -1.6

0.677-0.614

No problem

204

20h27

0923+392

track

292

40

-6 -2 -1.6

0.659

205

20h28

0923+392

pointliss

292

40

-7 0 -1.6

0.640

2mm: -8,1

206

20h30

3C279

track

198

45

-7 0 -1.6

0.594

207

20h34

3C279

pointliss

199

45

-7 0 -1.6

-9 2;-9 1;Fw 27,20;Fl7,14Jy

208

20h38

3C279

focusp2

199

45

-7 0 -1.6

0.27 -0.67

Big change as expected

209

20h42

3C279

pointliss

201

45

-9 2 -0.5

Very large beams?

210

20h47

3C279

focusp2

203

44

-9 2 -0.5

-2.4 -1.9

211

20h49

3C279

focusp

203

44

-9 2 -2.0

-1.3 ?

212-216

20h54

3C279

focusliss

203

44

-9 2 -2.0

Focus is -2.7!!

-1.5,-2.1,-2.7,-0.9,-0.3 two last scans many 1mm pixels lost

217

21h08

3C279

focusp

209

42

-10 -1 -3.0

-2.5 found 1mm

218

21h13

3C279

pointliss

211

42

-10 -1 -2.5

-13 1;-13 1Fw23,22Fl11,19Jy

strange

219-223

21h21

3C279

focusliss

213

41

-10 -1 -2.5

-7,0 -3.7!

-2.5 -3.1 -3.7 -1.9 -1.3

224-228

21h21

3C279

focusliss

213

41

-10 -1 -2.5

0.490

-4 1 foc:-3.5

-4 -4.6 -5.2 -3.4 -2.8

229

21h21

3C279

focusliss

220

38

-4 -1 -3.5

canceled reboot kid readouts + see note above about NCS temperature control

230-234

21h52

3C279

focusliss

-4 -1 -1.5

-1.5 -2.1 -2.7 -0.9 -0.3 pb with data?

NK2013_Jun13 (last edited 2013-06-13 22:14:18 by NikaBolometer)