Date: Wed, 14 Jan 1998 17:35:40 -0800 (PST) From: firstname.lastname@example.org To: email@example.com Cc: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org Subject: 2MASS WG Mtg #140 Minutes IPAC 2MASS Working Group Meeting #140 Minutes 1/13/98 Attendees: R. Beck, T. Chester, R. Cutri, T. Evans, J. Fowler, L. Fullmer, J. Huchra, T. Jarrett, D. Kirkpatrick, G. Kopan, B. Light, J. Mazzarella, H. McCallon, B. Nelson, S. Schneider, B. Wheaton, S. Wheelock, J. White AGENDA 1.) Camera Status 2.) Camera Timeouts 3.) 2MAPPS Redelivery Schedule 4.) Cal Scan Reruns 5.) Optical Catalog Association Status 6.) Database Status 7.) 2MASS at the AAS DISCUSSION 1.) Camera Status R. Cutri reported that the J bias jumps have resumed in the northern camera. This camera recently warmed up by accident, but it is not known whether this is connected to the return of the bias jumps. The southern camera is undergoing lab tests and is expected to be shipped to Chile in about a week. Data from the southern observatory are anticipated about mid-February. 2.) Camera Timeouts Ever since the survey began, timeouts in the camera have been observed on about 10% of the scans. The origin of this problem is not known. The symptoms are a breakdown in communication between the data raptor (frame grabber) board in the camera electronics and the instrument control computer, after which data taking halts. The operators must then manually reset the system and restart the affected scan. This has reduced survey efficiency by about 10%, and an improvement of this situation is desired. If possible, the cause of the timeouts will be identified and fixed. Since the search for this cause has so far proved fruitless, some fallback position is needed. This will take the form of modifying the observing control apparatus to recognize that a timeout has occurred and resume the scan with a frame missing; this frame will be dummied somewhere in the data preparation stage, i.e., a frame full of NaNs will appear to the downstream 2MAPPS software. In the near term, 2MAPPS will identify scans that have missing frames using information provided by the observatory in the scan header information, and will not attempt to process it. Eventually, 2MAPPS will be modified to process the scan despite the dummied frame, and the missing information will simply produce a local drop in signal- to-noise ratio. The modified 2MAPPS is expected to be version 2.2 and to be delivered in the summer (version 2.1 will be the southern-tuned version). Even the near-term changes will require RDFRAME to be redelivered, and the changes therein will depend on what changes the observatory can support in the way of providing information about which frame was skipped. The redelivery of RDFRAME is therefore not going to be coordinated with the 2.N redeliveries of 2MAPPS, but will be inserted as feasible. When this is done, the implementation of the soft-saturation-image capability will also be accomplished, since this has already been done in RDFRAME and needs only minor modifications to DARKS and DFLAT to be completed (if the real soft-saturation images are not available when this redelivery occurs, temporary images filled with the current all-pixel values will be generated and used in the interim). 3.) 2MAPPS Redelivery Schedule R. Cutri listed the expected upcoming 2MAPPS versions, their capabilities, and delivery dates. Version 2.0 is due February 2 and is intended to be able to process the northern data without further changes until data acquisition ends. Version 2.1 will be capable of processing both hemispheres, and so it will reflect tuning changes and possible software updates for the southern telescope; its delivery date is rather uncertain but expected to be about May 1. Version 2.2 will incorporate the camera-timeout dummy-frame capability discussed in section 2 above, and is expected some time in the summer (if the timeout problem can be solved in the hardware in the near future, this version will not be produced). The expected timeline for version 2.0 is as follows. After the February 2 delivery, system integration will be done, ending on February 15. From February 16 to March 1, system testing with a new RTB will take place. The decision to assemble a new set of data for regression testing is based on the known shortcomings of many scans included in the old RTB, i.e., we are not interested in comparing new and old processing of those scans. Anyone with suggestions for what should be included in the new RTB should send them to Roc. In addition to plenty of nominal data at various source densities, scans with bright stars, seeing variations, and bias jumps were recommended for inclusion. On March 2, a science team meeting will be held to discuss the RTB results and decide whether to accept version 2.0 of 2MAPPS. The acceptance criteria include requiring a complete end-to-end system (with full database access capability) and satisfaction of all relevant Level 1 requirements (i.e., not global-uniformity requirements, which cannot be evaluated at that time). If all goes well, northern-observatory production will begin on March 3. Testing and tuning for southern-observatory data will begin around February 16 and result in 2MAPPS version 2.1 about May 1, plus or minus a few weeks. R. Cutri requested that all cognizant engineers whose subsystems have science-team advisors send him and the advisors a status report on the delivery work. 4.) Cal Scan Reruns R. Beck reported that reprocessing of all cal scans had been completed. This includes cal scans between 970515 and 971224. These were processed by the version of 2MAPPS that was online as of December 19. These reprocessed cal data will be restored to rodan's /o2 disks and will replace the versions currently online. Note that the survey scan data that were previously processed will remain online. Be aware that the cal and survey data will have been processed with difference pipeline versions. 5.) Optical Catalog Association Status J. Fowler inquired about the status of the optical-catalog association requirements, which were pending some offline investigations of the needs of the rare-objects group and some Monte Carlo testing of false-association rates. R. Cutri reported that unless there is a change of recommendation by the rare object team, the optical association will include a third pass to identify possible proper motion matches. J. Fowler reported that the likelihood of including any changes in POSPTS with the 2MAPPS 2.0 delivery was now quite small and quickly vanishing. 6.) Database Status J. Mazzarella reported that significant improvements in the data base access setup had been achieved and that he would distribute a memo discussing the status of this work and instructions on how to exercise the current capabilities. 7.) 2MASS at the AAS R. Cutri reported that the 2MASS exhibit booth at the Washington AAS meeting was very well recieved. Especially impressive was the very large 3-color montage image that was prepared by Gene Kopan. "Good work" to one and all.