Date: Fri, 15 May 1998 09:59:47 -0700 (PDT) Message-Id: <199805151659.JAA25155@colman.ipac.caltech.edu> To: 2mass Subject: IPAC 2MASS WG Mtg #152 Minutes Cc: chas, stiening, bgreen Content-Length: 3002 X-Lines: 74 Status: RO IPAC 2MASS Working Group Meeting #152 Minutes 5/12/98 Attendees: R. Beck, T. Chester, S. van Dyk, D. Engler, T. Evans, J. Fowler, J. Gizis, R. Hurt, T. Jarrett, D. Kirkpatrick, G. Kopan, J. Mazzarella, H. McCallon, B. Nelson, B. Wheaton, S. Wheelock, J. White AGENDA 1.) Quality Assessment Calibration 2.) Galaxy Orientation 3.) 2MASS at the AAS Meeting DISCUSSION 1.) Quality Assessment Calibration D. Kirkpatrick and J. Gizis reported that they had made considerable progress in calibrating the quality assessment parameters. They are working on this with other people at UMASS using May 1997 data. These data are rather poor in terms of photometricity, but this type of data must also be included in the quality calibration. The goal is to calibrate photometricity and sensitivity on a nightly and scan-by-scan basis, and to be able to update the tile data base to make optimum use of rescanning opportunities. They estimated that the effort should be finished in 3-4 more weeks. A telecon was held Monday in which significant progress was made. T. Chester reported that one decision made during the telecon was that nights meeting the photometricity requirement but failing the sensitivity requirement would not be rescanned until after the sky coverage requirements are met. This will be revisited a year or two before the end of the mission, since at that time it may develop that tiles needing rescanning are available but unscanned tiles are not. It was suggested that data base access options should include a quality filter, since some objects in the data base are from noticeably lower-quality nights than others. R. Cutri has placed a lot of associated information on the web at the following URL address: http://spider.ipac.caltech.edu/staff/roc/2mass/QA/sens/photsum1.html 2.) Galaxy Orientation T. Chester and T. Jarrett reported that a preferential orientation of galaxies had been noticed and that there is a 95% probability that the point-spread functions (PSFs) have something to do with this anomaly. Although the southern data have not been checked very extensively, a symmetric effect appears to exist in the PSFs there. No satisfactory explanation has yet been found, and ongoing analysis may be viewed on the web at the following URL addresses: http://spider.ipac.caltech.edu/staff/tchester/2mass/analysis /galaxies/rtb/entire_rtb.html http://spider.ipac.caltech.edu/staff/tchester/2mass/analysis /galaxies/rtb/ellipticity.html 3.) 2MASS at the AAS Meeting S. van Dyk reported that the 2MASS booth for the AAS Meeting in San Diego is basically ready and that scheduling of 2MASS team members to work the booth is needed. This should be coordinated with Schuyler. The IPAC 2MASS team members going to this meeting are T. Chester, R. Cutri, S. van Dyk, T. Evans, R. Hurt, T. Jarrett, D. Kirkpatrick, G. Kopan, J. Mazzarella, and B. Nelson.