Date: Wed, 18 Feb 1998 12:41:28 -0800 (PST) Message-Id: <199802182041.MAA27083@colman.ipac.caltech.edu> To: 2mass Subject: IPAC 2MASS WG Mtg #143 Minutes Cc: chas, firstname.lastname@example.org, stiening, bgreen Content-Length: 3145 X-Lines: 74 Status: RO IPAC 2MASS Working Group Meeting #143 Minutes 2/17/98 Attendees: C. Beichman, R. Cutri, T. Evans, J. Fowler, L. Fullmer, T. Jarrett, G. Kopan, J. Mazzarella, H. McCallon, B. Nelson, B. Wheaton, S. Wheelock, J. White AGENDA 1.) Southern Observatory Status 2.) 2MAPPS 2.0 Test Status DISCUSSION 1.) Southern Observatory Status R. Cutri reported that the camera for the southern observatory has been shipped to the mountain and is expected to arrive next week. First light is expected during the first week of March. 2.) 2MAPPS 2.0 Test Status The testing of 2MAPPS 2.0 has proceeded through the first two nights of the RTB, 980114n and 971116n. Cognizant engineers are requested to examine data products relevant to their subsystems and make appropriate fixes and redeliveries. All tests are running on barney in /b1/OPS. The previous run of 980114n is also there, renamed 980114n_old, but much of this is scheduled to be deleted very soon to free up disk space, and very little besides quality files will be kept. A subsystem-by-system discussion took place, most of which involved details of limited interest and thus not suitable for wide dissemination. In general, quality indicators look good in all areas, while some problems do exist and are being worked. Some of the highlights were as follows. (A.) Two scans have anomalous cross-scan Tycho residuals in their final associations files after having had very small residuals in the intermediate position-reconstruction files (H. McCallon will investigate; after the meeting, he found that the two scans are of such low density that they may be flagged in QA review as not satisfying the Level 1 Req. for position reconstruction. Note that this does not imply the need to rescan these unless they fail some other aspect of the QA review). (B.) An apparent cross-scan responsivity dependence has been found in the overlap areas of adjacent scans, amounting to about 1% full-width variation, and using responsivities computed from more chronologically nearby twilight-flat sequences did not make the problem go away, but it reversed its sign. The effect of the new moving-window averaging of responsivities on this anomaly will be monitored. It may be due to simple estimation error in the technique used to compute responsivities from twilight flats, although it is not known why that should correlate with cross-scan position unless a brightness gradient in the twilight sky existed, which is possible. (C.) Distortion correction has been implemented in POSMAN but is currently turned off because downstream processors are not ready for it to be turned on. It has been decided that PICMAN will not need to make distortion corrections (subject to conflicting information from the southern observatory), and the changes needed to implement such corrections in PROPHOT appear to be manageable, but will not be included within 2MAPPS 2.0.