Occultation event with (12126) 99RM11, event index number 5061
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/12/05 23:24:52 UTC
J2000 position of star is 04:57:28.4 +25:07:00
Equinox of date position of star is 04:59:07.4 +25:09:24
Star is 144 degrees from the moon. Moon is 9% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 66% with SNR of 6.4 for the occulted depth (per occulted point)
Apparent velocity is 19.0 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
Position angle of asteroid motion is 84.0 degrees
The recommended exposure time corresponds to 11.4 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 28.3 km.
The sky-plane scale is 3585.3 km/arcsec.
Diameter estimates:
56.5 km assuming a 5% albedo, maximum of 3.0 sec for a central chord
23.1 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 53.2 km used for deployment plan.
Star training set for 12126_99RM11, (2026/12/05 23:25UT) Object RA Dec mag sep mel Aldebaran 04:37:28.1 +16:33:40 0.8 9.97 148 Alnath 05:27:59.8 +28:37:39 1.6 7.31 137 98 Tau 04:59:48.5 +25:05:22 5.8 0.17 144 PPM 093905 04:57:54.2 +24:37:58 7.0 0.59 144 98 Tau 04:59:48.5 +25:05:22 5.8 0.17 144 12126_99RM11 04:59:07.4 +25:09:24 15.3 143 Positions are for equinox of date
Star training set for 12126_99RM11, (2026/12/05 23:25UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 9.97 148 Alnath 05:26:17.6 +28:36:22 1.6 7.31 137 98 Tau 04:58:09.4 +25:03:00 5.8 0.17 144 PPM 093905 04:56:15.5 +24:35:32 7.0 0.59 144 98 Tau 04:58:09.4 +25:03:00 5.8 0.17 144 12126_99RM11 04:57:28.4 +25:07:00 15.3 144 Positions are for J2000