Comets T7 (C/LINEAR (2002 T7)), and Q4.

Projects D04_04,078_04 (Altenhoff et al.). Last update 24.5.04.

Summary of observations:

-----------------------------------------------
13.2. T7      5377-89    onoff 8x20 1x10 
              tau = 0.18
-----------------------------------------------
16.2. T7      6099-6104  onoff 6x20
              tau = 0.20
-----------------------------------------------
17.3. T7      9675-7     onoff 3x
-----------------------------------------------
22.3. T7      0861-3     onoff 3x16 tau=0.1
-----------------------------------------------
14.4. T7      4512-4     onoff 3x16
              4516,21,23 map   3x 180 4 160 4  
          tau=0.35, good quality but short scan length
-----------------------------------------------
4.5. T7       2.5h no obs, weather
-----------------------------------------------
5.5  T7       4h   no obs, weather
-----------------------------------------------
6.5. 01Q4B2   8385-90,8400   onoff 
              8391-2,5,9     3 maps 180x160

     total obs time 3.5 h, tau~0.31
     good map but scans short.
-----------------------------------------------
7.5. 01Q4MP   8758-9        onoff
              8760          map 360x160
              8763          map 360x200

    total obs time 2.5 h, very stable, tau=0.15
    very good map.
-----------------------------------------------
9.5. 01Q4MP   9419-20       onoff 2x16
              9421          map 360x200
              9424          map 350x100

      total obs time 2 h, tau=0.5, unstable, partially cloudy
-----------------------------------------------
11.5  T7      9705-6,12-14 onoff 16
              9708         map 360 6 180 4

          ca. 2.5h tau=0.21, anom. refr., observed by Helmut W.
          ok map, a bit stripy
-----------------------------------------------
11.5  Q4, 2.5h no obs, weather
-----------------------------------------------
14.5. T7      0486-7  onoff 2x16
              0488    map 360x180 peak flux > 50mJy
      tau = 0.5
      total obs 3h, only 1 h on comet due to tech problems,
      LST too early, and then He ran out 1 hour early!
      good map -- too bad we dont have a second.
-----------------------------------------------
21.5. Q4 + T7, 6h no obs, weather
-----------------------------------------------


data reduction 18.2.04

pointing source J0010+110

#  object   date     Julian date   LST    elev type   file
 1 BODYT7   13/02/04 2453049.1006 23.7193 66.77 o 20040213_5377 
 2 BODYT7   13/02/04 2453049.1055 23.8373 67.19 o 20040213_5378 

forgot to focus before 5377, but its only 0.07 mm off. should be ok.
Mars calibration is only 76%, so we might want to scale the flux up
by 1/0.76. tau_z = 0.18

 3 BODYT7   13/02/04 2453049.1224  0.2438 67.84 o 20040213_5383
 4 BODYT7   13/02/04 2453049.1263  0.3369 67.80 o 20040213_5384
 5 BODYT7   13/02/04 2453049.1301  0.4299 67.69 o 20040213_5385
 6 BODYT7   13/02/04 2453049.1340  0.5231 67.52 o 20040213_5386
 7 BODYT7   13/02/04 2453049.1379  0.6166 67.28 o 20040213_5387
 8 BODYT7   13/02/04 2453049.1417  0.7095 66.97 o 20040213_5388
 9 BODYT7   13/02/04 2453049.1468  0.8310 66.49 o 20040213_5389

results of coadded scans 1-9:
---------------------------------------------------
signal     +-         time        reduction options
mJy        mJy        sec      

0.3908E+01 0.9073E+00 0.1643E+04  100-300 pd
0.4966E+01 0.8548E+00 0.1643E+04  46-300 pd  <----
0.4886E+01 0.8864E+00 0.1644E+04  46-300 ph
---------------------------------------------------
after recalibration: 6.5 +- 1.1 mJy



This is the coadded data of the first 9 scans. Note that the emission around the reference channel 20 appears extended, and is seen in most surrounding channels. This is not the proper RA-DEC orientation - the angle is arbitrary.



pointing J0010+110. Mars and other calibrators are at 80% flux,
thus scale flux up by 1/0.8. tau_z=0.20, no anomalous refraction.

10 BODYT7   16/02/04 2453052.1835  1.9121 58.04 o 20040216_6099
11 BODYT7   16/02/04 2453052.1873  2.0028 57.17 o 20040216_6100
12 BODYT7   16/02/04 2453052.1911  2.0935 56.29 o 20040216_6101
13 BODYT7   16/02/04 2453052.1948  2.1844 55.39 o 20040216_6102
14 BODYT7   16/02/04 2453052.1986  2.2751 54.47 o 20040216_6103
15 BODYT7   16/02/04 2453052.2024  2.3658 53.54 o 20040216_6104

results of coadded scans 10-15:
---------------------------------------------------
signal     +-         time        reduction options
mJy        mJy        sec      

0.5799E+01 0.1029E+01 0.1125E+04 46-300 ph
0.6391E+01 0.1059E+01 0.1125E+04 100-300 ph  <----
---------------------------------------------------
after recalibration: 8.0 +- 1.3 mJy



This is the coadded data of scans 10 - 15 from Feb 16. Note that the emission around the reference channel 20 appears extended again.




Feb. 13.636 UT  Delta = 1.985  r = 1.486
Feb. 16.697             1.993      1.438


osc element from Altenhoff Jan 2004:

2453118.560400d0 ! = 2004/04/23.06o4d0 = T
 94.8574000d0    ! = Long. of Asc.Node
157.7381000d0    ! = Arg. of Perihel
160.5831000d0    ! = Inclination
  0.6145700d0    ! = Perihelion Distance      | Osc.Ep.=2453000.500000
  1.0005020d0    ! = Eccentricity             |     =2003/12/27.000000
   2000.000000d0 ! = J2000 = Elements equinox

data reduction 24.5.04

Caution: Flux densities are not yet absolutely calibrated. Assumed calibration 33,000 counts/Jy. The actual number may be 20% lower, so the fluxes would be 20% higher. This still needs some careful analysis.

  #  object     lambda   date   Julian date    LST    elev type   file

    1 BODYT7     .00000 13/02/04 2453049.1006 23.7192 66.77 o 20040213_5377.fits
    2 BODYT7     .00000 13/02/04 2453049.1055 23.8372 67.19 o 20040213_5378.fits
    3 BODYT7     .00000 13/02/04 2453049.1224  0.2438 67.84 o 20040213_5383.fits
    4 BODYT7     .00000 13/02/04 2453049.1263  0.3369 67.80 o 20040213_5384.fits
    5 BODYT7     .00000 13/02/04 2453049.1301  0.4298 67.69 o 20040213_5385.fits
    6 BODYT7     .00000 13/02/04 2453049.1340  0.5231 67.52 o 20040213_5386.fits
    7 BODYT7     .00000 13/02/04 2453049.1379  0.6166 67.28 o 20040213_5387.fits
    8 BODYT7     .00000 13/02/04 2453049.1417  0.7095 66.97 o 20040213_5388.fits
    9 BODYT7     .00000 13/02/04 2453049.1468  0.8310 66.49 o 20040213_5389.fits

 on  0.4896E+01 0.8778E+00 0.1643E+04  ph >52 best 0
 on  0.4746E+01 0.9045E+00 0.1643E+04  ph >100 best 0



   10 BODYT7     .00000 16/02/04 2453052.1835  1.9120 58.04 o 20040216_6099.fits
   11 BODYT7     .00000 16/02/04 2453052.1873  2.0028 57.17 o 20040216_6100.fits
   12 BODYT7     .00000 16/02/04 2453052.1911  2.0934 56.29 o 20040216_6101.fits
   13 BODYT7     .00000 16/02/04 2453052.1948  2.1843 55.39 o 20040216_6102.fits
   14 BODYT7     .00000 16/02/04 2453052.1986  2.2751 54.47 o 20040216_6103.fits
   15 BODYT7     .00000 16/02/04 2453052.2024  2.3657 53.54 o 20040216_6104.fits

 on  0.6520E+01 0.9488E+00 0.1124E+04 ph > 60 b7



   16 BODYT7     .00000 17/03/04 2453081.9859 23.1262 61.03 o 20040317_9675.fits
   17 BODYT7     .00000 17/03/04 2453081.9936 23.3124 61.99 o 20040317_9676.fits
   18 BODYT7     .00000 17/03/04 2453081.9968 23.3891 62.34 o 20040317_9677.fits

 on  0.1276E+02 0.1723E+01 0.4618E+03 ph > 60 b7



   19 BODYT7     .00000 22/03/04 2453087.0935  2.0463 51.50 o 20040322_0861.fits
   20 BODYT7     .00000 22/03/04 2453087.0973  2.1363 50.62 o 20040322_0862.fits
   21 BODYT7     .00000 22/03/04 2453087.1004  2.2104 49.89 o 20040322_0863.fits

 on  0.9888E+01 0.1800E+01 0.4618E+03



   22 BODYT7     .00000 14/04/04 2453109.7862 20.1602 30.91 o 20040414_4512.fits
   23 BODYT7     .00000 14/04/04 2453109.7891 20.2300 31.70 o 20040414_4513.fits
   24 BODYT7     .00000 14/04/04 2453109.7919 20.2983 32.48 o 20040414_4514.fits

del ch 44
on  0.3194E+02 0.2499E+01 0.4524E+03



      BODYT7     .00000 14/04/04 2453109.8009 20.5139 34.85 m 20040414_4516.fits
      BODYT7     .00000 14/04/04 2453109.8353 21.3440 43.71 m 20040414_4521.fits
      BODYT7     .00000 14/04/04 2453109.8622 21.9899 49.81 m 20040414_4523.fits

peak flux 27 mJy.
Gauss fits assuming different box sizes, 50, 100, 150, 200 arcsec.
This is to give a first impression on the source extend.
A more careful analysis still needs to be done.

MI_map> gfit cur fie 50
GFIT> Fits in subf. with BLC:    65    66 TRC:    79    80 iter   7
       0.453567922"   1.54841483" from centre
      FWHM   21.79" x  17.76" heigh      20.78 base     3.43 PA -82.13

MI_map> gfit cur fie 100
GFIT> Fits in subf. with BLC:    59    58 TRC:    87    86 iter  10
       0.781247377"   1.3755734" from centre
      FWHM   28.99" x  24.46" heigh      19.08 base     1.24 PA -80.27

MI_map> gfit cur fie 150
GFIT> Fits in subf. with BLC:    52    52 TRC:    94    94 iter  22
       1.16991699"   1.20047843" from centre
      FWHM   37.68" x  31.61" heigh      16.60 base     0.16 PA -78.26



   25 BODYT7     .00000 11/05/04 2453136.7766 21.7031 24.45 o 20040511_9705.fits
   26 BODYT7     .00000 11/05/04 2453136.7800 21.7867 25.29 o 20040511_9706.fits
   27 BODYT7     .00000 11/05/04 2453136.8382 23.1877 37.70 o 20040511_9712.fits
   28 BODYT7     .00000 11/05/04 2453136.8411 23.2576 38.21 o 20040511_9713.fits
   29 BODYT7     .00000 11/05/04 2453136.8441 23.3275 38.70 o 20040511_9714.fits

on  0.5489E+02 0.1918E+01 0.7413E+03 ph > 60 b7
on  0.5632E+02 0.1982E+01 0.7413E+03 ph > 100 b7



      BODYT7     .00000 11/05/04 2453136.7894 22.0121 27.49 m 20040511_9708.fits

bad weather, clouds moving through.
peak flux = 67 mJy
Gauss fit:

MI_map> gfit cur fie 50
     -4.8215971"   0.0883764401" from centre
      FWHM   20.30" x  12.12" heigh      51.98 base    12.41 PA  61.46
MI_map> gfit cur fie 100
      -3.97369146"  -1.78595126" from centre
      FWHM   31.51" x  25.91" heigh      41.45 base     3.76 PA -86.94
MI_map> gfit cur fie 150
      -3.60055923"  -2.70872974" from centre
      FWHM   39.12" x  32.70" heigh      38.04 base     0.99 PA -74.50



   30 BODYT7     .00000 14/05/04 2453139.8094 22.6897 22.66 o 20040514_0486.fits
   31 BODYT7     .00000 14/05/04 2453139.8135 22.7886 23.59 o 20040514_0487.fits

on  0.7056E+02 0.6003E+01 0.2961E+03 ph > 100 b7



      BODYT7     .00000 14/05/04 2453139.8163 22.8570 24.20 m 20040514_0488.fits
low skynoise
peak flux 83 mJy

I_map> gfit cur fie 50
      -3.99913096"  -3.03163171" from centre
      FWHM   21.97" x  18.85" heigh      66.41 base    14.41 PA -86.76
MI_map> gfit cur fie 100
      -5.00858688"  -3.77263284" from centre
      FWHM   31.24" x  26.04" heigh      60.26 base     6.72 PA  79.69
MI_map> gfit cur fie 150
      -5.619874"  -4.31119108" from centre
      FWHM   38.23" x  31.86" heigh      54.88 base     3.60 PA  74.90



    1 BODY01Q4B2 .00000 06/05/04 2453132.1559  6.5038 32.97 o 20040506_8385.fits
    2 BODY01Q4B2 .00000 06/05/04 2453132.1582  6.5586 33.15 o 20040506_8386.fits
    3 BODY01Q4B2 .00000 06/05/04 2453132.1605  6.6153 33.32 o 20040506_8387.fits
    4 BODY01Q4B2 .00000 06/05/04 2453132.1629  6.6727 33.49 o 20040506_8388.fits
    5 BODY01Q4B2 .00000 06/05/04 2453132.1665  6.7584 33.72 o 20040506_8389.fits
    6 BODY01Q4B2 .00000 06/05/04 2453132.1700  6.8442 33.92 o 20040506_8390.fits
    7 BODY01Q4B2 .00000 06/05/04 2453132.1736  6.9304 34.10 o 20040506_8391.fits
    8 BODY01Q4B2 .00000 06/05/04 2453132.2485  8.7330 31.86 o 20040506_8400.fits
    9 BODY01Q4B3 .00000 06/05/04 2453132.2514  8.8017 31.56 o 20040506_8401.fits

 on  0.1696E+02 0.1655E+01 0.1407E+04



      BODY01Q4B2 .00000 06/05/04 2453132.1778  7.0309 34.25 m 20040506_8392.fits
      BODY01Q4B2 .00000 06/05/04 2453132.2066  7.7246 34.48 m 20040506_8395.fits
      BODY01Q4B2 .00000 06/05/04 2453132.2316  8.3257 33.31 m 20040506_8399.fits
high skynoise
peak flux 28 mJy
Gauss fit:
MI_map> gfit cur fie 50
       4.19415092"  -11.0170517" from centre
      FWHM   21.47" x  15.30" heigh      21.48 base     4.17 PA -40.90
MI_map> gfit cur fie 100
       5.48149395"  -12.226593" from centre
      FWHM   36.05" x  28.89" heigh      16.20 base     1.32 PA  -6.88
MI_map> gfit cur fie 150
       7.78820372"  -14.2169247" from centre
      FWHM   71.14" x  49.28" heigh      12.71 base    -1.22 PA   7.62



   10 BODY01Q4MP .00000 07/05/04 2453133.2478  8.7819 37.36 o 20040507_8758.fits
   11 BODY01Q4MP .00000 07/05/04 2453133.2507  8.8514 37.06 o 20040507_8759.fits
   12 BODY01Q4MP .00000 07/05/04 2453133.3281 10.7130 23.97 o 20040507_8764.fits

on  0.2589E+02 0.2227E+01 0.4466E+03



on  0.2589E+02 0.2227E+01 0.4466E+03

      BODY01Q4MP .00000 07/05/04 2453133.2538  8.9253 36.69 m 20040507_8760.fits
      BODY01Q4MP .00000 07/05/04 2453133.2892  9.7778 31.57 m 20040507_8763.fits

low skynoise
peak 36 mJy
Gauss fits:
MI_map> gfit cur fie 50
       4.5492897"  -5.42974615" from centre
      FWHM   25.22" x  20.39" heigh      25.74 base     4.77 PA -60.96
MI_map> gfit cur fie 100
       5.12383461"  -6.5132513" from centre
      FWHM   31.22" x  26.00" heigh      23.79 base     2.96 PA -57.88
MI_map> gfit cur fie 150
       5.67589426"  -7.69886208" from centre
      FWHM   38.03" x  33.10" heigh      21.61 base     1.56 PA -50.87
MI_map> gfit cur fie 200
       6.44730663"  -9.23305225" from centre
      FWHM   47.31" x  42.46" heigh      18.96 base     0.52 PA -39.80



   13 BODY01Q4MP .00000 09/05/04 2453135.2833  9.7680 42.66 o 20040509_9419.fits
   14 BODY01Q4MP .00000 09/05/04 2453135.2862  9.8371 42.14 o 20040509_9420.fits

on  0.2500E+02 0.6583E+01 0.3023E+03  looks strangely asymmetric.



      BODY01Q4MP .00000 09/05/04 2453135.2897  9.9209 41.47 m 20040509_9421.fits
      BODY01Q4MP .00000 09/05/04 2453135.3401 11.1332 30.46 m 20040509_9427.fits

strong skynoise, high opacity. probably useless.