Occultation event with (16956) 98MQ11, event index number 4088
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/23 20:04:49 UTC
J2000 position of star is 04:48:49.4 -08:13:52
Equinox of date position of star is 04:50:06.5 -08:11:10
Star is 134 degrees from the moon. Moon is 83% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=16.3
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 9.0 per integration for unocculted signal
Expected flux drop is 83% with SNR of 7.5 for the occulted depth (per occulted point)
Apparent velocity is 20.9 km/sec on the sky relative to the star, or, 20.7 arcsec/hr.
Position angle of asteroid motion is 117.4 degrees
The recommended exposure time corresponds to 9.4 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 37.7 km.
The sky-plane scale is 3646.5 km/arcsec.
Diameter estimates:
42.7 km assuming a 5% albedo, maximum of 2.0 sec for a central chord
17.4 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 38.6 km used for deployment plan.
Star training set for 16956_98MQ11, (2026/08/23 20:05UT) Object RA Dec mag sep mel Rigel 05:15:49.2 -08:10:22 0.1 6.36 138 67Bet Eri 05:09:09.7 -05:03:14 2.8 5.67 139 56 Eri 04:45:22.2 -08:27:21 5.9 1.20 133 PPM 187374 04:50:45.7 -08:04:22 7.9 0.20 134 16956_98MQ11 04:50:06.5 -08:11:10 16.3 134 Positions are for equinox of date
Star training set for 16956_98MQ11, (2026/08/23 20:05UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 6.36 138 67Bet Eri 05:07:50.8 -05:05:13 2.8 5.67 139 56 Eri 04:44:05.3 -08:30:13 5.9 1.20 133 PPM 187374 04:49:28.6 -08:07:02 7.9 0.20 134 16956_98MQ11 04:48:49.4 -08:13:52 16.3 134 Positions are for J2000