Comet Data Review, Thursday, 30 October 2003 10:10 Intro Present: Ed Grayzeck By Telecon: Steve Joy Adolfo Vinas Frank Crary Chuck Acton Mark Sykes Stephanie McLaughlin Tyler Brown Mike A'Hearn Tony Farnham Anne Raugh Mike DiSanti (~11am) DSPE_0001 ========= Crary will compare ASCII and binary tables to make sure the straight conversion was made. There is a known problem with the time-of-flight column which will be corrected. Crary will check and verify ion efficiencies. Documentation will be amended to indicate the state of knowledge of electron efficiences. Add to the documentation describing M/Q bins a section to specify which species fall in which bin. Add a discussion of the spacecraft potential problem, as far as it is understood. Move information in the calinfo.txt file into a more stable, permanent location. SOme of the description currently contained in the DATA_SET catalog file will be moved to the same document. Steve Joy will modify the code which generates the human-readable time to fix an identified problem and regenerate the ASCII tables. Crary will check the information in the (new) calibration document, including the errors identified by Vinas in his presentation slide "Issues of PEPE's Information Files". DATAINFO.TXT the table describing the ion singles table gives the wrong number of bytes per row. The borrellyds.cat file description of coordinate systems needs a minus sign in front of the unit vectors. DISA_0001 ========= Need a graphic to illustrate the IRAS native coordinate system: solar elongation and observation inclination. Clarify text on the number of iterations used in procedures associated with survey scans and additional observations. Documentation on "Additional Observations" (AO) image photometry needs to make clear the effective resolution of the re-processed images. What is the relationship between the pixels in the reprocessed image and the real resolution of that image? TMPL1PHOT ========= The AO resolution question noted for DISA_0001 has a critical bearing on this data set. These data cannot be accepted until that answer is known and the impact on this data set can be determined. If the answer is simple and clear, there is no need for additional review on this point. The documentation contains a recipe for further processing. Sykes questions the validity of the IRAS re-calibration procedure proposed. The potentially controversial nature of the described procedure needs to be clearly stated, at the least. Preferably, the controversy should be solved and the ultimate solution documented. In the explanatory document, amend the Figure 2 caption to indicate more clearly that the data plotted have been further processed from the data obtained from Russ Walker. Add explicit reference to the "IRAS Explanatory Supplement". (Note that this is available as HTML on line from www.ipac.caltech.edu. Add horizontal bars in Figure 2 showing filter FWHM. Page 2: change reference to "fields of view of bandpasses" to "fields of view of detectors". Expand on the discussion of the technique used to subtract background from the various images. Mark notes there might be additional survey data of the same area (in ISSA) without the comet in it that might be useful for comparison. *** Mike Henry and Dan Britt join by telecon after lunch. *** DSIDS_0001 ========== Need information about the eight higher channels to complement the pdw_cal_approach document. Clarify the definition of frame number and "measurement_time", and the relationship between these two and the actual sampling time of the channels. This needs a documentation file for details and a statement in the label as a warning to users. Label also needs a warning that high frequency profiles are wide, overlapping and not sampled sequentially. Details should go in a separate document or the CONFIDENCE_LEVEL_NOTE of the data set catalog file. Verify that the amplitudes in the PWB files we have are correct. They show substantial differences from a published paper. We know that our event times are more accurate, but it's not clear this accounts for all the difference observed. Need an updated calibration procedure. In the pwd_call_approach.doc file, delete the section on the last page titled "Mdh notes on calibration process". Contact Dave Brinza for information on the intercomparison of PEPE and IDS measurements at the time of closest approach. If there is some, include it. DSMICAS_0001 ============ Check images in all data directories to attempt to determine the origin of an apparent border. (Probably this is an overscan effect.) We need a better explanation of what is going on in the 'far' images. Most show various areas that look like scattered light, with perhaps very faint images of the comet. The definition of "long exposure" needs to be added prominently to the documentation. Need range and phase angle information in the PDS Label, at least. As much positional information as can be accurately determined should be added to the PDS Labels, and the FITS headers if possible. The quaternion in the PDS label is ambiguous. It requires more documentation and compliant keywords in the PDS label. In the ds.cat file, the difference between RSEN and SRSEN is never defined. Quaternion keywords will be included in PDS labels if and only if the proposed definitions have been approved at the time we are ready to create the final labels. We will need a precise definition for the quaternions that currently appear in the FITS header. SBN will submit keyword definitions for new position keywords as needed to contain all the geometric information desired for the labels (including ecliptic orientation, e.g.). NOTE: SWIR and Qube files should be obtained for review at a future date. Once the geometry information is incorporated into the PDS labels, index tables containing this information should be extracted and included in the volume index/ directory. BORRDEM ======= Add Kirk, et al. (2003) reference to reference file once published. Need formal errors for the model elements, if possible. There is not even an order-of-magnitude statement. Note that once the Oberst model is added, the comparison of the two will likely yield a useful measure of error. Complete the MICAS instrument catalog file. Add Nx, Ny and Nz matrices to the data set, and include the tables in the supplementary stuff in the data. Put the PNG files in the document directory. Determine the inertial reference frame for the data and document it. If it is possible to do so, the illumination angle should be provided. Tony will regenerate the PNG images with axis scales. If it is possible to indicate where the outgassing jet structures were in the PNG images, do so. _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ Additional Borrelly Data: o Magnetometer data from DS1 (both Borrelly and Braille). o Oberst elevation model for Borrelly.