Occultation event with (16956) 98MQ11, event index number 1397
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/10/22 00:04:49 UTC
J2000 position of star is 02:13:28.4 -24:34:18
Equinox of date position of star is 02:14:39.0 -24:27:07
Star is 139 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=15.5
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 15.8 km/sec on the sky relative to the star, or, 20.0 arcsec/hr.
Position angle of asteroid motion is 63.6 degrees
The recommended exposure time corresponds to 7.1 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 31.1 km.
The sky-plane scale is 2849.3 km/arcsec.
Diameter estimates:
42.7 km assuming a 5% albedo, maximum 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, (2025/10/22 00:05UT) Object RA Dec mag sep mel Achernar 01:38:40.3 -57:06:23 0.5 33.29 106 68Omi Cet 02:20:39.1 -02:51:42 2.0 21.64 160 PPM 244874 02:20:07.9 -25:49:29 6.2 1.85 137 PPM 244791 02:14:46.7 -24:40:13 8.2 0.22 139 16956_98MQ11 02:14:39.0 -24:27:07 15.5 139 Positions are for equinox of date
Star training set for 16956_98MQ11, (2025/10/22 00:05UT) Object RA Dec mag sep mel Achernar 01:37:43.1 -57:14:13 0.5 33.29 106 68Omi Cet 02:19:20.8 -02:58:46 2.0 21.64 160 PPM 244874 02:18:58.1 -25:56:33 6.2 1.85 137 PPM 244791 02:13:36.1 -24:47:24 8.2 0.22 139 16956_98MQ11 02:13:28.4 -24:34:18 15.5 139 Positions are for J2000