Date: Thu, 27 Aug 1998 11:07:46 -0700 (PDT) To: 2mass Subject: IPAC 2MASS WG Meeting #162 Minutes Cc: chas, stiening, bgreen Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-MD5: upynQB1tQ5c+opZG4KnLYA== IPAC 2MASS Working Group Meeting #162 Minutes 8/25/98 Attendees: R. Cutri, S. Van Dyk, R. Beck, T. Evans, R. Hurt, J. White, J. Fowler, G. Kopan, H. McCallon, S. Wheelock, R. Tam, D. Kirkpatrick, W. Wheaton, T. Jarrett AGENDA 1.) Project Update 2.) 2MAPPS 2.1 Delivery 3.) 2MASS Sampler 4.) QA Update DISCUSSION The meeting began with distribution of rather tasty materials brought by D. Kirkpatrick from his most recent trip to the Big Island, Hawaii. 1.) Project Update The southern telescope was closed, due to a dome drive failure, which is being repaired. Guenter Riegler was visiting this week on WIRE business, but R. Cutri was to provide him with a 2MASS update as well. 2.) 2MAPPS 2.1 Delivery R. Cutri inquired of W. Wheaton on new news on the PSF generation front. W. Wheaton responded that he had no new PSFs, but was taking inventory of the current PSFs and rerunning the seeing history. R. Cutri stressed that finalizing the southern PSFs was a high-priority action item. W. Wheaton will intends to have a whole new set of PSFs by midday Friday. He intends to make determination of the saturation thresholds on the south arrays the next order of business. [CLARIFICATION: W. Wheaton will only be filling out the table of PSFs for bad seeing (i.e., seeing "shape" parameter sh > 1.01 or so), not delivering a whole new set. The PSFs already delivered are OK, and they cover the seeing frequency histograms for the south up to about the 90-95 percentile level. That is, 5-10% of the data have seeing worse than that covered by the PSF table. Because bad seeing is relatively rare, a lot of nights in the south must be inventoried to be sure of having enough data to make PSFs that cover the tail of the histogram.] R. Cutri provided an update on the photometric bias fix. G. Kopan has a preliminary version of code based on analyses of several nights. For a block of scans (each set of cal scans and sci scans) the routine generates a bias profile over 10 cross-scan bins, performing linear interpolation within the profile bins. From this profile it then generates correction tables. S. Wheelock will provide code to apply the corrections to the point source files. G. Kopan hopes to have the code ready by Wednesday. An off-chance exists that there may need to be a new MAPCOR that rederives the psf-fit vs. aperture photometry normalization after the cross-scan variation correction has been made. R. Cutri indicated to T. Evans that she contemplate on this, but not take any immediate action. The normalization and calibration issues that result from the correction will will be analyzed when the prototype correction code has been implemented. It is possible that the bias correction could be established based on a dependence of the bias on PSF ID's. This could be determined only for dense scans, since, as G. Kopan pointed out, some cal scan blocks have too small an amount of information to acquire enough statistics. G. Kopan will look into the PSF ID relation for some dense scans. 3.) 2MASS Sampler The Sampler night 971116n is being rerun, due to a MAPCOR error. T. Evans is to determine the magnitude of this error, as it affects the data that have been ops-processed since July 16. The glint artifact parameters are "out of whack," based on a new namelist which was in the wrong directory. Havoc is not being wreaked on the entire glint search, but H and Ks secondary glints may be lost, due to the current magnitude threshold. The problem seems to be only for the north. The correction will have to be applied to the database. R. Beck will issue a memo on the rules for redelivery and namelist locations. The src deliveries should be made to /2massc/del/src and the namelist files to the datan and datas directories, on rodan. R. Beck is working on a change log webpage, that he will maintain. He stated that he would prefer no changes in namelists. But team members will be alerted when major changes in deliveries are made. One potentially disturbing aspect of the most recent run of 971116n showed that the number of sources in the .bfpts file (for, say, one scan) was different than for the previous run. Why this is so is not clear and must be hunted down. One test to locate these "new" sources would be to run smerge on both the old and new .bfpts files. Because of these problems with the most recent run and the need for yet another re-run, the Sampler has now slipped into October, rather than the intended mid-September date. T. Jarrett is generating the extended sources catalog. The catalog will consist of a >300-column table with various parameters. T. Jarrett will provide to T. Evans the criteria with thresholds on these parameters for the auxiliary extended source classification table, which will consist of about 10 columns. There will be both a short and long form of this catalog. The first "view" will be the short form, with option to go to a second, longer "view". R. Cutri gave as "homework" to *everyone* on the team to test out the IRSA interface, by trying out queries in CatScan and utilizing the Survey Visualizer. Any suggestions or comments on how to improve this interface should be directed to J. Mazzarella and J. Good, being sure to "cc" R. Cutri and T. Handley on any communications. 4.) QA Update R. Hurt will be working soon on the scan-by-scan QA webpage.