Preliminary release (30/09/2017): 119 stellar positions released to support unique Triton occultation events

On Thursday 5 October an important and rare astronomical event will take place: Triton will be occulting a star (called UCAC4 410-143659 or GaiaDR2 2610107907030969600). This stellar occultation will be visible from Europe across the Atlantic to the USA. A predicted occultation path has been computed using the preliminary Gaia DR2 position and proper motion for this star.

The Triton position can, however, still be improved. In order to maximise the scientific output of the occultation event, we have decided to release astrometry for 119 stars in the field surrounding Triton at this moment. The most suitable stars between magnitudes 12 and 17 have been chosen for astrometric calibration purposes. Please note that full validation of the data is not yet done and therefore some caution is required when interpreting the results. Nevertheless, we believe the data will allow improvement of the occultation prediction.

Scientists using these data to improve Triton astrometry are encouraged to make their deduced positions public so that science return can be maximised for all groups observing the event. Please keep us informed of your efforts and results in this topic.

The 119 stars are available for download through the links below:

VOT format

CSV format

When using these data, please follow the acknowledgment and citation guidelines as given here.

 

Preliminary release (02/10/2017): Additional stellar positions released to support unique Triton occultation events

In order to facilitate earlier conducted Triton campaigns from September, we provide preliminary astrometry for an additional 334 stars available for download through the links below:

VOT format

CSV format

When using these data, please follow the acknowledgment and citation guidelines as given here.

 
Preliminary release (23/05/2017): Three stellar positions released to support unique occultation events
We released the astrometry for three stars to support the observations of unique occultation events. On 22 June and 23 July 2017 relatively brights stars will be occulted by the largest known centaur Chariklo. Then, on 5 October 2017 an occultation by Neptune's largest satellite, Triton, can be observed. The preliminary Gaia DR2 data for the three stars and more information about these events can be found here.