Date: Sun, 3 May 1998 23:48:00 -0700 (PDT) Message-Id: <199805040648.XAA06816@colman.ipac.caltech.edu> To: 2mass Subject: IPAC 2MASS WG Mtg #150 Minutes Cc: chas, stiening, bgreen Content-Length: 2386 X-Lines: 71 Status: RO IPAC 2MASS Working Group Meeting #150 Minutes 4/28/98 Attendees: R. Beck, R. Cutri, S. van Dyk, T. Evans, J. Fowler, L. Fullmer, T. Jarrett, D. Kirkpatrick, G. Kopan, H. McCallon, B. Wheaton, S. Wheelock, J. White AGENDA 1.) Quality Criteria 2.) 2MASS-to-SIRTF Transitions 3.) Southern Data 4.) Null Values for Photometric Uncertainty 5.) Visit by M. Skrutskie DISCUSSION 1.) Quality Criteria R. Cutri reported that a telecon would be held on the morning of Wednesday, 29 April, to discuss criteria for quality assessment. This will include criteria for deciding: (a.) whether scans are acceptable for inclusion in the data base; (b.) when and how to update the survey-tile data base; (c.) whether a tile should be scheduled for re-observation, and how to implement this. 2.) 2MASS-to-SIRTF Transitions J. Fowler and J. White reported that they are now in the process of phasing out of 2MASS and into SIRTF, with about 20% of their time currently allocated to SIRTF. This will increase to 80% in late June. 3.) Southern Data R. Beck reported that processed data from the southern observatory is on rex, mostly 980319s and mostly cal scans. R. Cutri requested all cognizant engineers to check the products from their subsystems. The new "where2" utility should be used to find the latest locations, e.g., "where2 south". 4.) Null Values for Photometric Uncertainty T. Evans requested information on how to use the photometric uncertainty value of 8.888 for data base loading purposes; specifically, is it a "null" indicator like 9.999? It was decided to defer this question to a splinter group. [Note added in proof: B. Wheaton later reported that 8.888 is assigned in PROPHOT when the newly approved one-sigma dispersion parameter comes out negative or greater than 8.888, which is possible with the inclusion of negative fluxes in the flux-domain averaging; J. Fowler reported that the same is true in PFPOST. 8.888 was chosen to be different from 9.999 to indicate that in fact non-null photometric values had been averaged. The decision how to encode this information in the data base remains to be made.] 5.) Visit by M. Skrutskie R. Cutri reported that M. Skrutskie will visit IPAC from May 26 through May 29 to work on darks, flats, and masks.