IPAC 2MASS Working Group Meeting Minutes, #66
IPAC 2MASS Working Group Meeting #66 Minutes 7/18/95
Attendees: T. Chester, R. Cutri, T. Evans, J. Fowler,
L. Fullmer, T. Jarrett, G. Kopan, B. Light, J. White
- August '95 Science Team Meeting
- Proposed Obs/IPAC Interface Document
- Status Reports
- August '95 Science Team Meeting --
A science team meeting is scheduled at IPAC for August 2-3. A memo
containing the agenda has been distributed. The main subjects will
be the analysis of the April '95 data and the galaxy processing
subsystem. It was noted that the agenda list appears somewhat ambitious
for a two-day meeting. It is desirable to complete the current analysis
tasks before the meeting, and if possible to have some results from
the revised frame-flattening technique.
Another subject of the meeting will be a talk by B. Light on the
inner workings of KAMPhot. He showed some plots comparing PSF FWHM
values to the "pfrac" parameter produced by G. Kopan's bumps program;
the correlation was strong. The related subject of seeing estimation
arose; once again the frequency of the estimate was questioned. The
baseline approach for 2MAPPS has been to estimate the seeing once per N
(TBD) point sources, probably with a minimum of one estimate per scan,
although if the scan is too sparse for a good estimate, some measure of
uncertainty would be needed. No method for computing such an estimate
- Proposed Obs/IPAC Interface Document --
A request to change the Observatory/IPAC Interface document has
been received from M. Rudenko. There is a desire to combine the
three bands' frame data into a single file. The header file is also
requested to become part of the same file. This causes problems for the
2MAPPS design. A splinter group consisting of R. Cutri, J. Fowler, G.
Kopan, and J. White will study the issue and send a response.
- Status Reports --
The monthly status report from each attendee was requested, and the
following information was provided.
- T. Chester & T. Jarrett: about to issue a memo on galaxy
photometry that discusses ability to meet Level-1 requirements
(can be met in small-aperture case), preparing for galaxy processing
session of upcoming meeting.
- R. Cutri: working on photometric calibration (internal
consistency of April data is very good, better than before except
when large seeing variations cause light loss from aperture, but
a correction for this appears feasible).
- T. Evans: finalizing APM/OptID associations, attended
SyBase IQ class (new SyBase server; IPAC is a beta-test site), modifying
DBMAN design as a result.
- J. Fowler: working on version 3 of the FDD and PIXCAL
- L. Fullmer: about to finish processing Abell galaxy
images, ready for new task in support of galaxy processing review.
- G. Kopan: working on frame-offset program;
has PSF families for each band from April data, to be used for
centroiding; the new version of the program runs about 15 times as
fast as the corresponding task in DAOPhot.
- B. Light: working on KAMPhot issues for the
upcoming meeting, updating the PSF photometric normalization in
KAMPhot (recently found to drift unacceptably), pipeline analysis, and
- J. White: working on TAPELOAD development and the