Asteroid designation: 2016 WT3
Discovery station: Mt. Lemmon Survey
Close approach date (UTC): 2016 11 21.54
Close approach distance (× lunar distance): 0.95
Latest orbit & observations
On 13 October 2016, the IAWN Steering Committee met in Pasadena, California. Those present and virtually present (via Adobe Connect) included Detlef Koshny, Michael Kuppers and Gerhard Drolshagen (ESA); Giovanni Valsecchi (IAPS-INAF), Line Drube Alan Harris (DLR); Linda Billings, Rob Landis, Victoria Friedensen, Kelly Fast, and Lindley Johnson (NASA); Michael A’hearn (University of Maryland); Tim Spahr (NEO Sciences); Romana Kofler and Daniel Garcia Yarnoz (UNOOSA), Makoto Yoshikawa (JAXA); Sung Ki Cho (KASI); and Clemens Rumpf (UKSA).
Rob Landis began with a general welcome and introductory remarks. His presentation also contained a summary of NASA’s Planetary Defense Coordination Office (PDCO), a plug for the new IAWN web page, an updated list of IAWN signatories, and a short discussion of IAWN in some upcoming meetings and exercises. Rob’s presentation is here .
Romana Kofler next discussed the interface between the IAWN and the UN’s Office of Outer Space Affairs. Her presentation (here) discusses three main items for IAWN from the OOSA perspective: general communication on NEOs for the public, object-specific communication with member states in the event of a warning, and lastly capacity-building through UN-SPIDER.
Next up, Detlef Koschny gave a very detailed presentation on ESA’s NEO-related activities. In particular, Detlef summarized various studies and workshops, and also discussed some astrometric follow-up observations that included observing some NEOs near 27th magnitude!
Gerhard Drolshagen, also of ESA, followed Detlef with a summary presentation of IAWN-related activities. Included in this discussion was an attempt at generating a new impact rating scale, in the spirit of the Torino, Palermo, and Broomfield scales, in hopes of creating some means of communicating this information with the public. Gerhard also discussed communication of a credible threat–this is a subject returned to frequently during this Steering Committee Meeting.
Lindley Johnson next discussed notification criteria here. This relatively simple-looking set of slides took awhile to discuss. Criteria for reporting impacts, and possible impacts, is a knotty subject where actual announcements need to be carefully crafted and discussed. As many other participants noted in the lively discussion at the meeting, there are actual concrete examples of scientists being charged with crimes for improperly discussing or predicting (or failing to predict!) earthquakes in Italy. One expects that there will be plenty of lively discussion about not only reporting criteria, but actual wording of reports of impact alerts in the future.
Following a lunch break, Tim Spahr and Rob Landis led a discussion of thresholds and communication (presentation here). They both stressed the subject is difficult, and that various interested parties might have different criteria (essentially size and impact probabilities) for notification. Further, the tendency to hyperbolize impact threats by the media was driven home by the appearance of a humorous but true article in the Daily Mail (see the presentation for details). Lastly, the presentation showed some of the content on the developing IAWN.net web presence.
Linda Billings ended the formal presentation block by discussing recent work on impact scales (presentation here.) She stressed the need for common language and avoiding discussion of impact probabilities with the public, as the general public does not operate well in probability space. Linda’s presentation also puts forth a standard template for close approach and impact announcements; the IAWN close approach reports are using this template partially, and will embrace it fully in the the next version or two of the reporting software.
The meeting concluded with a discussion of future IAWN meetings at UNCOPUOS in late January 2017, and at the next Planetary Defense Conference in Tokyo, Japan (web site here).
Readers of this page will notice recent postings on close approaches of new minor planets. We expect to produce these reports automatically for each object passing closer than 1 lunar distance from the center of the Earth. These informational messages will eventually contain a bit more information on each object, including physical characteristics, where available. The main purpose of these messages will be to note that close approaches of this nature are commonplace. Further, providing some scale (the size of the Moon’s orbit) for reference may assist readers in picturing the range and geometry of each approach. As the search capacity of the IAWN improves, we expect more objects to be found and reported on this page. Keeping track of these close approaches is one way to view, in real time, the improving efficiency of the worldwide search network.