Occultation event with (18046) 99RN116, event index number 4368
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/10/09 09:01:34 UTC
J2000 position of star is 05:01:32.8 -14:10:35
Equinox of date position of star is 05:02:46.4 -14:08:21
Star is 103 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=15.9
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 35% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 15.4 km/sec on the sky relative to the star, or, 16.2 arcsec/hr.
Position angle of asteroid motion is 8.8 degrees
The recommended exposure time corresponds to 17.8 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 1.1 km.
The sky-plane scale is 3436.3 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, (2026/10/09 09:02UT) Object RA Dec mag sep mel Rigel 05:15:49.5 -08:10:22 0.1 6.77 100 Arneb 05:33:54.7 -17:48:18 2.6 8.33 95 64 Eri 05:01:10.4 -12:29:59 4.2 1.68 103 PPM 215219 05:05:05.5 -14:20:04 7.1 0.59 102 PPM 215169 05:02:39.7 -14:06:28 8.7 0.04 103 18046_99RN116 05:02:46.4 -14:08:21 15.9 103 Positions are for equinox of date
Star training set for 18046_99RN116, (2026/10/09 09:02UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 6.77 100 Arneb 05:32:43.8 -17:49:20 2.6 8.33 95 64 Eri 04:59:55.8 -12:32:17 4.2 1.68 103 PPM 215219 05:03:52.1 -14:22:13 7.1 0.59 102 PPM 215169 05:01:26.1 -14:08:43 8.7 0.04 103 18046_99RN116 05:01:32.8 -14:10:35 15.9 103 Positions are for J2000