Occultation event with (18046) 99RN116, event index number 1353
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/10/10 04:31:21 UTC
J2000 position of star is 02:36:33.5 -16:03:25
Equinox of date position of star is 02:37:46.5 -15:56:45
Star is 44 degrees from the moon. Moon is 87% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.1 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 18.7 km/sec on the sky relative to the star, or, 22.0 arcsec/hr.
Position angle of asteroid motion is 43.0 degrees
The recommended exposure time corresponds to 12.2 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 15.9 km.
The sky-plane scale is 3068.3 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, aximum of 2.6 sec for a central chord
19.6 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 42.7 km used for deployment plan.
Star training set for 18046_99RN116, (2025/10/10 04:31UT) Object RA Dec mag sep mel Rigel 05:15:46.7 -08:10:26 0.1 39.34 40 68Omi Cet 02:20:39.0 -02:51:43 2.0 13.75 35 76Sig Cet 02:33:18.6 -15:07:58 4.8 1.35 44 PPM 211717 02:36:18.4 -15:28:18 8.5 0.59 44 PPM 211735 02:37:05.1 -16:01:27 9.7 0.18 44 18046_99RN116 02:37:46.5 -15:56:45 15.4 44 Positions are for equinox of date
Star training set for 18046_99RN116, (2025/10/10 04:31UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 39.34 40 68Omi Cet 02:19:20.8 -02:58:46 2.0 13.75 35 76Sig Cet 02:32:05.1 -15:14:44 4.8 1.35 44 PPM 211717 02:35:05.2 -15:35:00 8.5 0.59 44 PPM 211735 02:35:52.1 -16:08:08 9.7 0.18 44 18046_99RN116 02:36:33.5 -16:03:25 15.4 44 Positions are for J2000