Occultation event with (18046) 99RN116, event index number 3975
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/08/10 04:24:22 UTC
J2000 position of star is 04:43:40.0 -08:26:27
Equinox of date position of star is 04:44:56.8 -08:23:34
Star is 48 degrees from the moon. Moon is 9% illuminated.
Stellar brightness G=10.7, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 43.6 per integration for unocculted signal
Expected flux drop is 99% with SNR of 43.3 for the occulted depth (per occulted point)
Apparent velocity is 27.2 km/sec on the sky relative to the star, or, 24.8 arcsec/hr.
Position angle of asteroid motion is 114.6 degrees
The recommended exposure time corresponds to 3.3 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 22.2 km.
The sky-plane scale is 3953.6 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, maximum of 1.8 sec for a central chord
19.6 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 42.7 km used for deployment plan.
Star training set for 18046_99RN116, (2026/08/10 04:24UT) Object RA Dec mag sep mel Rigel 05:15:49.1 -08:10:22 0.1 7.64 43 67Bet Eri 05:09:09.6 -05:03:14 2.8 6.88 41 56 Eri 04:45:22.1 -08:27:21 5.9 0.12 48 55 Eri 04:44:51.7 -08:44:54 6.7 0.36 48 PPM 187254 04:44:33.2 -08:27:17 9.0 0.12 48 18046_99RN116 04:44:56.8 -08:23:34 16.2 47 Positions are for equinox of date
Star training set for 18046_99RN116, (2026/08/10 04:24UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 7.64 43 67Bet Eri 05:07:50.8 -05:05:13 2.8 6.88 41 56 Eri 04:44:05.3 -08:30:13 5.9 0.12 48 55 Eri 04:43:35.1 -08:47:47 6.7 0.36 48 PPM 187254 04:43:16.4 -08:30:11 9.0 0.12 48 18046_99RN116 04:43:40.0 -08:26:27 16.2 48 Positions are for J2000