Occultation event with (9142) Rhesus, event index number 4592
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/11/07 09:01:14 UTC
J2000 position of star is 05:17:40.8 +08:56:21
Equinox of date position of star is 05:19:08.9 +08:57:58
Star is 121 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 6.0 per integration for unocculted signal
Expected flux drop is 60% with SNR of 3.6 for the occulted depth (per occulted point)
Apparent velocity is 13.1 km/sec on the sky relative to the star, or, 14.2 arcsec/hr.
Position angle of asteroid motion is 73.9 degrees
The recommended exposure time corresponds to 10.5 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 25.7 km.
The sky-plane scale is 3309.7 km/arcsec.
Diameter estimates:
43.7 km assuming a 5% albedo, maximum of 3.3 sec for a central chord
17.8 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 42.3 km used for deployment plan.
Star training set for 9142_Rhesus, (2026/11/07 09:01UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.6 +07:24:35 0.4 9.40 112 Bellatrix 05:26:34.4 +06:22:18 1.6 3.18 119 16 Ori 05:10:48.4 +09:51:43 5.4 2.24 123 PPM 148725 05:19:39.4 +09:14:35 7.7 0.30 121 PPM 148708 05:18:39.9 +08:56:25 8.9 0.12 121 9142_Rhesus 05:19:08.9 +08:57:58 16.0 121 Positions are for equinox of date
Star training set for 9142_Rhesus, (2026/11/07 09:01UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 9.40 112 Bellatrix 05:25:07.8 +06:20:58 1.6 3.18 119 16 Ori 05:09:19.7 +09:49:46 5.4 2.24 123 PPM 148725 05:18:11.1 +09:12:59 7.7 0.30 121 PPM 148708 05:17:11.8 +08:54:47 8.9 0.12 121 9142_Rhesus 05:17:40.8 +08:56:21 16.0 121 Positions are for J2000