Occultation event with (12444) Prothoon, event index number 4690
Regions able to see the event: US,RECON
Geocentric closest approach at 2026/11/14 11:19:32 UTC
J2000 position of star is 04:11:52.2 +02:45:00
Equinox of date position of star is 04:13:16.3 +02:49:03
Star is 129 degrees from the moon. Moon is 23% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 7.4 per integration for unocculted signal
Expected flux drop is 49% with SNR of 3.6 for the occulted depth (per occulted point)
Apparent velocity is 20.0 km/sec on the sky relative to the star, or, 21.7 arcsec/hr.
Position angle of asteroid motion is 58.7 degrees
The recommended exposure time corresponds to 15.0 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 31.0 km.
The sky-plane scale is 3325.5 km/arcsec.
Diameter estimates:
62.2 km assuming a 5% albedo, maximum of 3.1 sec for a central chord
25.4 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 63.8 km used for deployment plan.
Star training set for 12444_Prothoon, (2026/11/14 11:20UT) Object RA Dec mag sep mel Aldebaran 04:37:27.9 +16:33:40 0.8 14.97 140 67Bet Eri 05:09:10.3 -05:03:13 2.8 16.03 135 PPM 147177 04:05:34.3 +02:53:53 5.9 1.92 127 PPM 147317 04:14:47.3 +02:56:07 8.2 0.40 129 PPM 147290 04:13:09.7 +02:41:26 9.5 0.13 128 12444_Prothoon 04:13:16.3 +02:49:03 15.1 129 Positions are for equinox of date
This table contains the target star visibility for registered US sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 0.0 % chance of getting at least one chord. There is a 0.0% chance of 2 or more chords assuming clear weather for all.
| Site Name | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time | Xtrack (km) |
Prob |
|---|---|---|---|---|---|---|---|---|---|---|
This table contains the target star visibility for registered RECON sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 76.3 % chance of getting at least one chord. There is a 60.9% chance of 2 or more chords assuming clear weather for all.
| Site Name | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time | Xtrack (km) |
Prob |
|---|---|---|---|---|---|---|---|---|---|---|
| Toppenish/White Swan | 11:15:39 | -38.8 | Dark | Down | 34.7 | 230.1 | Up | 11:12:39-11:18:39 | 210.5 | 0.000 | The Dalles | 11:15:41 | -39.5 | Dark | Down | 35.6 | 229.7 | Up | 11:12:43-11:18:43 | 159.0 | 0.000 | PNWRO | 11:15:35 | -37.9 | Dark | Down | 34.1 | 231.8 | Up | 11:12:41-11:18:41 | 132.9 | 0.000 | Maupin | 11:15:41 | -39.6 | Dark | Down | 35.8 | 230.0 | Up | 11:12:38-11:18:38 | 117.5 | 0.002 | Madras | 11:15:41 | -39.7 | Dark | Down | 36.2 | 230.3 | Up | 11:12:38-11:18:38 | 67.0 | 0.102 | Sisters | 11:15:42 | -40.1 | Dark | Down | 36.7 | 230.0 | Up | 11:12:37-11:18:37 | 48.9 | 0.237 | Bend | 11:15:42 | -40.0 | Dark | Down | 36.7 | 230.4 | Up | 11:12:38-11:18:38 | 18.4 | 0.543 | Oregon Observatory | 11:15:42 | -40.1 | Dark | Down | 36.9 | 230.4 | Up | 11:12:35-11:18:35 | 5.9 | 0.616 | Chiloquin | 11:15:43 | -40.7 | Dark | Down | 37.9 | 230.7 | Up | 11:12:37-11:18:37 | -107.3 | 0.005 | Klamath Falls | 11:15:43 | -40.8 | Dark | Down | 38.1 | 231.0 | Up | 11:12:36-11:18:36 | -142.9 | 0.000 |
Star training set for 12444_Prothoon, (2026/11/14 11:20UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 14.97 140 67Bet Eri 05:07:50.8 -05:05:13 2.8 16.03 135 PPM 147177 04:04:10.1 +02:49:34 5.9 1.92 127 PPM 147317 04:13:23.0 +02:52:07 8.2 0.40 129 PPM 147290 04:11:45.6 +02:37:22 9.5 0.13 128 12444_Prothoon 04:11:52.2 +02:45:00 15.1 129 Positions are for J2000