Occultation event with (12126) 99RM11, event index number 4412
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/10/16 04:05:11 UTC
J2000 position of star is 05:18:08.2 +25:20:33
Equinox of date position of star is 05:19:47.3 +25:22:09
Star is 174 degrees from the moon. Moon is 27% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=16.0
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 7.7 per integration for unocculted signal
Expected flux drop is 51% with SNR of 4.0 for the occulted depth (per occulted point)
Apparent velocity is 5.4 km/sec on the sky relative to the star, or, 5.0 arcsec/hr.
Position angle of asteroid motion is 96.3 degrees
The recommended exposure time corresponds to 10.7 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 28.0 km.
The sky-plane scale is 3833.3 km/arcsec.
Diameter estimates:
56.5 km assuming a 5% albedo, maximum of 10.5 sec for a central chord
23.1 km assuming a 30% albedo, maximum of 4.3 sec for a central chord
Cross-track diameter of 53.2 km used for deployment plan.
Star training set for 12126_99RM11, (2026/10/16 04:05UT) Object RA Dec mag sep mel Aldebaran 04:37:27.7 +16:33:39 0.8 13.23 161 Alnath 05:27:59.3 +28:37:39 1.6 3.74 177 103 Tau 05:09:44.8 +24:17:53 5.3 2.52 172 PPM 094241 05:19:09.8 +24:02:10 7.9 1.34 174 PPM 094233 05:18:37.8 +25:08:39 10.0 0.35 174 PPM 094247 05:19:37.1 +25:05:27 10.1 0.28 174 12126_99RM11 05:19:47.3 +25:22:09 16.0 175 Positions are for equinox of date
Star training set for 12126_99RM11, (2026/10/16 04:05UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 13.23 161 Alnath 05:26:17.6 +28:36:22 1.6 3.74 177 103 Tau 05:08:06.6 +24:15:54 5.3 2.52 172 PPM 094241 05:17:31.7 +24:00:33 7.9 1.34 174 PPM 094233 05:16:59.0 +25:07:00 10.0 0.35 174 PPM 094247 05:17:58.3 +25:03:51 10.1 0.28 174 12126_99RM11 05:18:08.2 +25:20:33 16.0 174 Positions are for J2000