This page presents the prediction of occultations by selected TNOs and Centaurs for 2017. These predictions are made in the framework of Lucky Star project (led by B. Sicardy) and in collaboration with groups from Paris, Meudon, Granada and Rio.
Information about the predictions can be found in Assafin et al. (2010) for Pluto system predictions, Assafin et al. (2012) for the TNO predictions, Camargo et al. (2014) for TNO and Centaur predictions. Ephemerides of the selected objects come from Desmars et al. (2015) and they are regularly updated thanks to observations from Minor Planet Center and our own observations made at ESO, Pic du Midi, Calar Alto, Sierra Nevada and Observatorio do Pico dos Dias. Predictions make use of Gaia DR1 (Gaia Collaboration, 2016) for the positions of stars.
For three very specific occultations occurring this year, the Gaia team has provided position, proper motion and parallax with the release of three preliminary Gaia DR2 stellar positions. The events are for Chariklo on 22 June 2017 and 23 July 2017, and for Triton on 5 October 2017.
IMPORTANT: If you plan to observe one of these predicted events, please contact J. Desmars .
Information about the table (below):
- Predictions can be filtered by date, object, and/or magnitude;
- By clicking on one map, you will find a specific page of the event, with the prediction map, occultation circumstances and the field of view with the occulted star.
- As the table may be long to display, filters on date and magnitude are initially applied. Do not hesitate to change the filters to see all the events.
Information about the maps:
- The straight and continue lines are the shadow limits considering the estimated radius;
- Each red dot is spaced by one minute, the nominal occultation time is to the big red dot (that is the geocentric closest approach);
- The arrow shows the direction of the shadow motion;
- The precision tha mainly depends on the object is about 20 mas and can be down to the mas level for specific object such as Pluto or Chariklo (1 mas corresponds to 0.7 x Δ in km where Δ is the geocentric distance of the body in au);
- The star G* and J* are the G (from Gaia) and J (from 2MASS) magnitudes, normalized to a body moving at 20km/s in order to enhance very slow events;
- The body offset is at the upper left corner, if JPL ephemeris is used;
- Areas in dark grey correspond to full night (Sun elevation below -18 degrees) and areas in light grey correspond to twilight (Sun elevation between -18 and 0 degrees) while daytime is in white;
- Be careful, the dates are from the moment of the event in Universal Time, the night of the event may begin at the date before.
For specific campaigns, you can have a look to F. Braga Ribas page.