Occultation event with (18046) 99RN116, event index number 5140
Regions able to see the event: Australia
Geocentric closest approach at 2026/12/09 12:13:17 UTC
J2000 position of star is 04:38:23.5 -18:10:40
Equinox of date position of star is 04:39:35.3 -18:07:33
Star is 133 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 6.5 per integration for unocculted signal
Expected flux drop is 62% with SNR of 4.0 for the occulted depth (per occulted point)
Apparent velocity is 17.0 km/sec on the sky relative to the star, or, 18.7 arcsec/hr.
Position angle of asteroid motion is 90.3 degrees
The recommended exposure time corresponds to 10.2 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 23.8 km.
The sky-plane scale is 3266.1 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, maximum of 2.8 sec for a central chord
19.6 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 42.7 km used for deployment plan.
Star training set for 18046_99RN116, (2026/12/09 12:13UT) Object RA Dec mag sep mel Rigel 05:15:50.0 -08:10:21 0.1 13.29 144 Nihal 05:29:24.0 -20:44:23 2.8 12.03 132 54 Eri 04:41:37.3 -19:37:17 3.7 1.57 131 PPM 214590 04:38:55.9 -18:16:43 7.8 0.22 133 PPM 214598 04:39:15.4 -17:59:55 9.1 0.15 133 18046_99RN116 04:39:35.3 -18:07:33 15.7 133 Positions are for equinox of date
Star training set for 18046_99RN116, (2026/12/09 12:13UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 13.29 144 Nihal 05:28:14.7 -20:45:36 2.8 12.03 132 54 Eri 04:40:26.6 -19:40:20 3.7 1.57 131 PPM 214590 04:37:44.2 -18:19:51 7.8 0.22 133 PPM 214598 04:38:03.5 -18:03:03 9.1 0.15 133 18046_99RN116 04:38:23.5 -18:10:40 15.7 133 Positions are for J2000