Occultation event with (18046) 99RN116, event index number 4387
Regions able to see the event: Europe
Geocentric closest approach at 2026/10/13 05:11:55 UTC
J2000 position of star is 05:01:11.3 -14:34:56
Equinox of date position of star is 05:02:24.7 -14:32:42
Star is 133 degrees from the moon. Moon is 7% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 39% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 15.4 km/sec on the sky relative to the star, or, 16.3 arcsec/hr.
Position angle of asteroid motion is 15.3 degrees
The recommended exposure time corresponds to 13.9 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 3.7 km.
The sky-plane scale is 3409.8 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, maximum of 3.1 sec for a central chord
19.6 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 42.7 km used for deployment plan.
Star training set for 18046_99RN116, (2026/10/13 05:12UT) Object RA Dec mag sep mel Rigel 05:15:49.6 -08:10:22 0.1 7.17 136 Arneb 05:33:54.7 -17:48:18 2.6 8.23 126 PPM 215104 05:00:13.3 -16:20:10 5.6 1.87 132 PPM 215123 05:00:49.5 -14:46:04 7.3 0.44 133 PPM 215160 05:02:04.7 -14:42:12 9.3 0.18 133 18046_99RN116 05:02:24.7 -14:32:42 15.9 133 Positions are for equinox of date
Star training set for 18046_99RN116, (2026/10/13 05:12UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 7.17 136 Arneb 05:32:43.8 -17:49:20 2.6 8.23 126 PPM 215104 04:59:01.1 -16:22:30 5.6 1.87 132 PPM 215123 04:59:36.3 -14:48:22 7.3 0.44 133 PPM 215160 05:00:51.5 -14:44:27 9.3 0.18 133 18046_99RN116 05:01:11.3 -14:34:56 15.9 133 Positions are for J2000