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Peculiar Data




Date: Wed, 06 Jun 2007 17:50:49 -0500
From: Thomas F. Droege <droege@fastmail.fm>
To: tass@tass-survey.org
Subject: Peculiar Data

Hi Everyone,

I am starting to look at data.  From time to time I come across stars as
below.  That is stars with a few bright values.  Would someone like to
look at this star and tell me what is going on?  I have images for at
least JD2454153, possibly others that I can make available.  At the
moment they are uncorrected, but I can run them through the pipeline if
you want.  At first glance, I don't see anything unusual.  I don't see
how the pipeline could suddenly make a star so bright.  At first I
thought this was an error in my program, but when I checked Mike's data
base I see the same thing.  I think I see a lot of stars like this.  At
least a few have turned up in the first few degrees of data. Note, this
star flips in color from I brighter to V brighter.  No, I don't think
this is really happening, I am looking for a processing error.

Tom Droege

>From Mike's data base, but I see the same in my processed raw data:

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  ## TASS Bigfile Download
## 6/6/07 3:39 PM (GMT -0600)
## Query Parameters:
## RA range: 80.92212260003797 - 80.94827739996202 DEC range:
50.405966666666664 - 50.42263333333333
## Data Format - for details see
http://spiff.rit.edu/tass/pipeline/pipeline.html#photom
## Column 1 - internal star id
## Column 2 -  number of observations
## Column 3 -  RA
## Column 4 - Dec
## Column 5 - Julian Date of observation
## Column 6 -  name of first passband
## Column 7 -  magnitude in first passband
## Column 8 -  uncertainty of magnitude in first passband
## Column 9 -  quality flag associated with first passband
## Column 10 -  name of second passband
## Column 11 -  magnitude in second passband
## Column 12 -  uncertainty of magnitude in second passband
## Column 13 -  quality flag associated with second passband
6224679 51      80.935  50.4153 2452907.9352    V       12.136  0.037
0       I       10.472  0.008   0
6224679 51      80.9355 50.4149 2452911.9258    V       12.15   0.04
0       I       10.425  0.014   0
6224679 51      80.9342 50.4153 2452912.9344    V       12.134  0.041
0       I       10.678  0.018   0
6224679 51      80.9359 50.4153 2452913.9338    V       12.129  0.067
0       I       10.612  0.018   0
6224679 51      80.9347 50.4144 2452920.9001    V       12.302  0.018
0       I       10.736  0.006   0
6224679 51      80.9347 50.415  2452920.9148    V       12.174  0.016
0       I       10.702  0.005   0
6224679 51      80.9353 50.4148 2452922.9074    V       12.245  0.021
0       I       10.587  0.006   0
6224679 51      80.9357 50.4149 2452925.8949    V       12.238  0.018
0       I       10.746  0.005   0
6224679 51      80.9351 50.4142 2452931.8805    V       12.314  0.019
0       I       10.757  0.005   0
6224679 51      80.9355 50.415  2452934.8623    V       12.362  0.02
0       I       10.738  0.006   0
6224679 51      80.9353 50.4148 2452934.877     V       12.261  0.019
0       I       10.707  0.005   0
6224679 51      80.9361 50.4128 2452925.8904    V       12.3    0.033
0       I       10.643  0.005   0
6224679 51      80.9352 50.415  2452951.8216    V       12.249  0.018
0       I       10.56   0.005   0
6224679 51      80.9345 50.4154 2452963.7963    V       12.274  0.017
0       I       10.737  0.005   0
6224679 51      80.9358 50.4147 2452968.7731    V       12.311  0.019
0       I       10.62   0.005   0
6224679 51      80.9355 50.4151 2452986.7338    V       12.284  0.019
0       I       10.691  0.005   0
6224679 51      80.9365 50.4148 2452999.6924    V       12.291  0.018
0       I       10.734  0.005   0
6224679 51      80.936  50.4157 2453268.9491    V       12.411  0.025
0       I       10.578  0.01    0
6224679 51      80.9368 50.4149 2453269.9422    V       12.357  0.023
0       I       10.593  0.009   0
6224679 51      80.936  50.4146 2453270.9399    V       12.364  0.024
0       I       10.608  0.009   4
6224679 51      80.9347 50.4141 2453274.9326    V       12.144  0.02
0       I       10.692  0.01    4
6224679 51      80.9336 50.4136 2453269.9424    V       12.025  0.015
0       I       10.721  0.005   0
6224679 51      80.9366 50.4132 2453278.9318    V       11.853  0.013
0       I       10.565  0.004   0
6224679 51      80.9337 50.4137 2453303.8515    V       12.294  0.024
0       I       10.51   0.009   0
6224679 51      80.9342 50.416  2453281.9243    V       12.675  0.029
0       I       10.615  0.005   0
6224679 51      80.9354 50.4162 2453282.9215    V       12.107  0.018
0       I       10.542  0.004   0
6224679 51      80.9359 50.415  2453283.9193    V       12.175  0.019
0       I       10.56   0.004   0
6224679 51      80.9335 50.4141 2453284.9141    V       11.889  0.014
0       I       10.511  0.004   0
6224679 51      80.9345 50.4139 2453288.9048    V       12.081  0.017
0       I       10.551  0.004   0
6224679 51      80.9361 50.4144 2453323.8008    V       12.156  0.021
0       I       10.547  0.009   4
6224679 51      80.9338 50.4133 2453314.8293    V       11.774  0.012
0       I       10.497  0.005   0
6224679 51      80.9356 50.4159 2453316.8288    V       11.848  0.016
0       I       10.487  0.005   0
6224679 51      80.9349 50.4153 2453317.8131    V       12.028  0.016
0       I       10.556  0.005   0
6224679 51      80.9373 50.4137 2453321.8036    V       11.864  0.017
0       I       10.548  0.005   0
6224679 51      80.9341 50.4141 2453323.7967    V       12.001  0.015
0       I       10.55   0.005   0
6224679 51      80.9348 50.4154 2453354.7274    V       12.157  0.006
0       I       10.54   0.004   0
6224679 51      80.9359 50.4142 2453658.9422    V       12.137  0.033
0       I       10.549  0.014   0
6224679 51      80.9356 50.4149 2453659.9395    V       12.174  0.034
0       I       10.571  0.012   0
6224679 51      80.9353 50.4143 2453661.9271    V       12.31   0.06
0       I       10.903  0.073   0
6224679 51      80.9347 50.4157 2453662.9326    V       12.135  0.087
0       I       10.661  0.049   0
6224679 51      80.9355 50.4143 2453671.9088    V       12.102  0.036
0       I       10.523  0.012   0
6224679 51      80.9347 50.4148 2453677.8833    V       12.28   0.051
0       I       10.689  0.017   0
6224679 51      80.9351 50.4149 2453681.8702    V       12.257  0.046
0       I       10.714  0.016   0
6224679 51      80.9355 50.415  2453684.8711    V       12.178  0.036
0       I       10.537  0.011   0
6224679 51      80.9349 50.415  2454015.9277    V       6.85    0.083
0       I       8.981   0.043   0
6224679 51      80.9344 50.4147 2454016.927     V       6.412   0.071
0       I       8.767   0.037   0
6224679 51      80.9335 50.4154 2454049.8414    V       5.987   0.073
0       I       8.356   0.035   0
6224679 51      80.9343 50.4153 2454083.7475    V       7.358   0.05
0       I       9.104   0.02    0
6224679 51      80.9352 50.4145 2454084.7387    V       6.207   0.06
0       I       8.59    0.031   0
6224679 51      80.9348 50.4158 2454088.734     V       8.845   0.067
0       I       9.582   0.028   0
6224679 51      80.9348 50.416  2454153.5503    V       4.47    0.077
0       I       8.046   0.036   0



-- 
  Thomas F. Droege
  droege@fastmail.fm