Occultation event with (16956) 98MQ11, event index number 1388
Regions able to see the event: Australia
Geocentric closest approach at 2025/10/19 15:45:53 UTC
J2000 position of star is 02:14:41.8 -24:25:30
Equinox of date position of star is 02:15:52.5 -24:18:20
Star is 140 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 9.4 per integration for unocculted signal
Expected flux drop is 71% with SNR of 6.7 for the occulted depth (per occulted point)
Apparent velocity is 16.0 km/sec on the sky relative to the star, or, 20.3 arcsec/hr.
Position angle of asteroid motion is 61.0 degrees
The recommended exposure time corresponds to 7.2 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 30.0 km.
The sky-plane scale is 2845.3 km/arcsec.
Diameter estimates:
42.7 km assuming a 5% albedo, aximum of 2.7 sec for a central chord
17.4 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 38.6 km used for deployment plan.
Star training set for 16956_98MQ11, (2025/10/19 15:46UT) Object RA Dec mag sep mel Achernar 01:38:40.3 -57:06:23 0.5 33.48 117 68Omi Cet 02:20:39.1 -02:51:42 2.0 21.47 149 PPM 244874 02:20:07.9 -25:49:29 6.2 1.80 138 PPM 244826 02:16:58.0 -24:39:11 8.5 0.43 140 PPM 244813 02:16:21.6 -24:17:46 9.4 0.11 140 16956_98MQ11 02:15:52.5 -24:18:20 15.4 140 Positions are for equinox of date
Star training set for 16956_98MQ11, (2025/10/19 15:46UT) Object RA Dec mag sep mel Achernar 01:37:43.1 -57:14:13 0.5 33.48 117 68Omi Cet 02:19:20.8 -02:58:46 2.0 21.47 149 PPM 244874 02:18:58.1 -25:56:33 6.2 1.80 138 PPM 244826 02:15:47.5 -24:46:19 8.5 0.43 140 PPM 244813 02:15:11.0 -24:24:55 9.4 0.11 140 16956_98MQ11 02:14:41.8 -24:25:30 15.4 140 Positions are for J2000