Occultation event with (9142) Rhesus, event index number 5002
Regions able to see the event: SMexico
Geocentric closest approach at 2026/12/03 04:20:33 UTC
J2000 position of star is 05:05:34.5 +08:28:08
Equinox of date position of star is 05:07:02.5 +08:30:13
Star is 107 degrees from the moon. Moon is 30% illuminated.
Stellar brightness G=8.4, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 88.5 per integration for unocculted signal
Expected flux drop is 100% with SNR of 88.4 for the occulted depth (per occulted point)
Apparent velocity is 17.8 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
Position angle of asteroid motion is 86.3 degrees
The recommended exposure time corresponds to 2.1 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 28.2 km.
The sky-plane scale is 3229.5 km/arcsec.
Diameter estimates:
43.7 km assuming a 5% albedo, maximum of 2.5 sec for a central chord
17.8 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 42.3 km used for deployment plan.
Star training set for 9142_Rhesus, (2026/12/03 04:21UT) Object RA Dec mag sep mel Aldebaran 04:37:28.1 +16:33:40 0.8 10.81 114 Bellatrix 05:26:34.6 +06:22:18 1.6 5.29 102 14 Ori 05:09:21.0 +08:31:53 5.7 0.57 106 PPM 148427 05:07:02.6 +08:30:14 8.3 0.00 107 9142_Rhesus 05:07:02.5 +08:30:13 15.7 107 Positions are for equinox of date
Star training set for 9142_Rhesus, (2026/12/03 04:21UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 10.81 114 Bellatrix 05:25:07.8 +06:20:58 1.6 5.29 102 14 Ori 05:07:52.9 +08:29:53 5.7 0.57 106 PPM 148427 05:05:34.6 +08:28:09 8.3 0.00 107 9142_Rhesus 05:05:34.5 +08:28:08 15.7 107 Positions are for J2000