SSSC Sprint Liveblog – Mario Juric

Mario Juric – “LSST Solar System Processing Product Owner” for the LSST Solar System Processing Team.

LSST provides 3 types of products to enable Solar System science: Prompt Products = Real-time (60 s) and Daily Catalog; Data Release Orbit Catalog (annual). Data Products Definition Document LSC-163. Daily Catalog is best estimate at that time. Annual Data Release Catalog is like a very well done, self-consistent, single-software, best-result Daily Catalog; will reprocess all the previous data. For example, the Annual Data Release is the most convenient for survey completeness analyses.

Real-time alerts are not precision science, but to enable very rapid follow-up. DIASources (= Difference Image Analysis Sources) are associated with Solar System Objects when known. Every DIASource will be fit with a trailed source model. Comparing PSF models to trailed models should be an excellent method for identifying trailed objects.

Daily (Orbit) Catalog. Why daily? So that LSST can identify objects in tomorrow’s data. Product is orbits, physical properties (H,G), and other things we can study here at the Sprint. The goal is for this catalog to be as complete as possible and cross-matched to external catalogs. This is still to enable rapid follow-up, so software will be updated as needed (e.g., bug fixes). It is not designed for all goals. GAIA catalog. Not clear how the template process is going to work in the early part (first year) of analysis.

Data Release (Annual) Catalog – best for precision photometry and astrometry since computed with self-consistent software and best knowledge of calibration. Note that this will include LSST-data only (not past MPC data).

Current Plan: After observing, find tracklets, run MOPS, recompute catalog (including merging and precovery), make updated SSObject table (“LSSTORB”), and predict for next night. But, currently don’t have firm plan to cross-reference the LSST catalog to the MPC catalog.

New plan would be to send new discoveries to MPC, they produce MPCORB, and then LSST uses MPCORB for its next night predictions. This is a proposal that will probably be detailed by October and approved by the end of the year or so.

Some discussion on possible risks with relying on the MPC, but Mario points out that there are many “third-party risks” in LSST and that there will be back-up plans.

Single tracklets (or even doublets) are, in the initial plan, not reported anywhere. When MPC is able to handle tracklets, those can be passed too.

Team is Joachim Moeyens (40%), Siegfried Eggl (100%), Mario Juric (25%). Lynne Jones and Eric Bellm help. This time is just for solar system; this doesn’t include the other LSST resources which provide all the undergirding.

Glad Mario is on our team!



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