Occultation event with (12126) 99RM11, event index number 1564
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/11/21 18:41:12 UTC
J2000 position of star is 02:58:05.5 +19:07:43
Equinox of date position of star is 02:59:33.6 +19:13:51
Star is 152 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=11.9, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 22.2 per integration for unocculted signal
Expected flux drop is 95% with SNR of 21.1 for the occulted depth (per occulted point)
Apparent velocity is 17.2 km/sec on the sky relative to the star, or, 19.0 arcsec/hr.
Position angle of asteroid motion is 73.5 degrees
The recommended exposure time corresponds to 2.1 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 24.4 km.
The sky-plane scale is 3247.5 km/arcsec.
Diameter estimates:
56.5 km assuming a 5% albedo, aximum of 3.3 sec for a central chord
23.1 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 53.2 km used for deployment plan.
Star training set for 12126_99RM11, (2025/11/21 18:41UT) Object RA Dec mag sep mel Aldebaran 04:37:24.6 +16:33:33 0.8 23.41 168 Hamal 02:08:38.3 +23:35:01 2.0 12.62 142 46Rho3Ari 02:57:54.1 +18:07:29 5.6 1.17 151 PPM 118751 03:02:39.3 +19:30:14 8.5 0.78 152 PPM 118707 02:59:52.0 +19:19:53 8.8 0.12 152 12126_99RM11 02:59:33.6 +19:13:51 15.1 152 Positions are for equinox of date
Star training set for 12126_99RM11, (2025/11/21 18:41UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 23.41 168 Hamal 02:07:10.8 +23:27:41 2.0 12.62 142 46Rho3Ari 02:56:26.6 +18:01:18 5.6 1.17 151 PPM 118751 03:01:10.9 +19:24:10 8.5 0.78 152 PPM 118707 02:58:23.8 +19:13:45 8.8 0.12 152 12126_99RM11 02:58:05.5 +19:07:43 15.1 152 Positions are for J2000