RECON TNO event list

This table lists the best candidates for TNO occultation for the next two years that are visible from the entire network. These events all have a minimum success probability of 30%.

This list was last updated at 2018/09/25 18:32:01 UT

,
Idx ET Desig Vmag Since
(yrs)
TNO pos err Diam(5%) Diam(30%) DES Classification StarID RA Dec mag minsep selong RECON Prob
155122 2018 Oct 20 07:45:15 248835 21.6 0.0 0.12 76 31 CENTAURR GA1320:01948292 04:30:55.4 +43:16:45 16.4 0.15 130 1.00 37.3%
173974 2018 Dec 19 07:29:57 14UT114 21.1 0.7 0.11 105 43 CENTAURR GA1260:01057486 04:05:13.3 +36:29:04 16.1 0.12 154 1.00 33.9%
179173 2019 Jan 28 05:11:20 14YY49 22.9 3.7 0.25 58 24 CENTAURR GA0900:02190224 06:59:55.5 +01:25:26 14.5 0.11 150 1.00 32.4%
216397 2019 Oct 22 11:56:34 281371 20.3 0.8 0.13 83 34 CENTAURR GA1000:01539890 06:15:14.5 +11:18:06 14.8 0.11 114 1.00 51.6%
232708 2020 Jan 02 02:58:42 15875 21.7 0.9 0.37 240 98 3:2E GA1160:01598803 05:48:34.5 +27:51:02 16.6 0.11 166 1.00 40.8%
239981 2020 Jan 10 10:15:07 248835 21.7 0.0 0.12 76 31 CENTAURR GA1280:01542791 04:42:15.5 +39:35:00 13.3 0.06 142 1.00 43.3%
241265 2020 Jan 15 09:50:18 449097 21.1 2.9 0.30 72 30 CENTAURR GA1260:03019228 06:59:27.2 +37:05:53 7.9 0.11 161 1.00 50.3%

The green lines highlight those events for which the star is visible to the entire RECON network at the time of the appulse. This corresponds to a "score" (second to last column) of 1. If the score is between 0 and 1, only part of the network can view the star at the right time. The last column is the estimate of the probability of success for RECON if it attempts this event. This number is based on the uncertainty in the prediction combined with the actual geometry for RECON for the event. In general, we look for a probability greater than about 30% for an official RECON campaign. This probability does not include any factors such as weather.

Most of the columns are self-explanatory. The two diameters give an estimate of the size of the object for two different albedos (5% and 30%). "TNO pos err" is the uncertainty in the position of the TNO at the time of the appulse, in arc-seconds. "minsep" is the minimum separation (in arcsec) between the star and TNO as seen from the position of the center of the earth. "selong" is the angle between the sun and the object (solar elongation) at the time of the event.

Marc W. Buie, Southwest Research Institute

RECON