Occultation event with (18046) 99RN116, event index number 1247
Regions able to see the event: Australia
Geocentric closest approach at 2025/08/22 17:20:54 UTC
J2000 position of star is 02:44:05.4 -10:20:40
Equinox of date position of star is 02:45:20.1 -10:14:13
Star is 108 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=12.8, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 12.7 per integration for unocculted signal
Expected flux drop is 94% with SNR of 12.0 for the occulted depth (per occulted point)
Apparent velocity is 15.9 km/sec on the sky relative to the star, or, 17.1 arcsec/hr.
Position angle of asteroid motion is 162.1 degrees
The recommended exposure time corresponds to 1.9 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 6.4 km.
The sky-plane scale is 3345.9 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, aximum of 3.0 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, (2025/08/22 17:21UT) Object RA Dec mag sep mel Rigel 05:15:46.3 -08:10:26 0.1 37.16 71 68Omi Cet 02:20:38.6 -02:51:45 2.0 9.59 112 PPM 184889 02:41:27.4 -09:20:40 6.2 1.31 108 PPM 212038 02:50:34.7 -10:26:44 7.9 1.31 106 PPM 211930 02:45:48.8 -10:17:48 9.4 0.13 107 18046_99RN116 02:45:20.1 -10:14:13 15.8 107 Positions are for equinox of date
Star training set for 18046_99RN116, (2025/08/22 17:21UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 37.16 71 68Omi Cet 02:19:20.8 -02:58:46 2.0 9.59 112 PPM 184889 02:40:12.2 -09:27:13 6.2 1.31 108 PPM 212038 02:49:20.1 -10:33:03 7.9 1.31 106 PPM 211930 02:44:34.1 -10:24:14 9.4 0.13 107 18046_99RN116 02:44:05.4 -10:20:40 15.8 108 Positions are for J2000