Adam Ginsburg's blog

Articles by Adam (adam.g.ginsburg@gmail.com)

• Defining Pointing Terminology

  There has been a lot of confusion about pointing terminology.

  CSO pointing model: the telescope pointing model used and written as a black box

  • has already been corrected for aberration/nutation
  • is in current epoch coordinates (e.g. J2007.34)

  Instrument-specific correction to pointing model

  • ??? also referred to as 't terms'
  • is offset between CSO pointing model and real locations
  • should be a function of alt (and maybe az)
  • is recorded in "RPC" files
  • is in units of distance on the sky: delta-RA and delta-DEC, or delta-ALT and delta-AZ will be in the same units, while if they were in coordinate units delta-RA and delta-AZ would have to be scaled by 1/cos(DEC) or 1/cos(ALT) respectively

  FAZO and FZAO: Fixed Azimuth Offset and Fixed Zenith Angle Offset

  • these are ambiguously defined in the pipeline code
  • ???? FAZO/FZAO include both the functional instrument specific pointing offset and any manual changes made at the telescope [manual only relevant to 2007 observations]
  • ???? or are these JUST fixed offsets, and the instrument specific corrections are not included? Either way, how can I separate out manually-applied fixed offsets from fitted-model offsets?

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• New Pipeline to CVS

  Open topic - what needs to be done to put the new pipeline on the CVS?

  1. Under the assumption that it will be used by others, the documentation needs to be complete.
  2. Needs to be compatible with current pipeline (no name overlap)
  3. Have to fix / update some Goddard astrolib routines that have short integer for loops and need long integer for loops Which ones?
  4. Probably need to add instrument specific pointing model corrections for non-BGPS observations

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• BOLOCAM PIPELINE BLOG

  Guy pointed out in the CU meeting today that we need a better way to keep track of changes / problems / etc. The wiki's kind of a pain, and this will serve as something of a replacement for the e-mail-only conversations that have been going on with the Software Power Team.

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