Occultation event with (7641) Cteatus, event index number 3348
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/03/05 00:29:32 UTC
J2000 position of star is 10:26:33.6 -34:15:21
Equinox of date position of star is 10:27:44.7 -34:23:23
Star is 39 degrees from the moon. Moon is 97% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=14.5
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 45% with SNR of 4.4 for the occulted depth (per occulted point)
Apparent velocity is 16.4 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
Position angle of asteroid motion is 116.1 degrees
The recommended exposure time corresponds to 12.3 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 34.5 km.
The sky-plane scale is 3088.4 km/arcsec.
Diameter estimates:
76.6 km assuming a 5% albedo, maximum of 4.7 sec for a central chord
31.3 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 71.8 km used for deployment plan.
Star training set for 7641_Cteatus, (2026/03/05 00:30UT) Object RA Dec mag sep mel Bet Cru 12:49:16.2 -59:49:53 1.3 34.27 57 Mu Vel 10:47:54.3 -49:33:32 2.8 15.62 49 PPM 287445 10:14:34.3 -33:09:42 6.5 3.00 40 PPM 287726 10:28:58.7 -34:32:03 7.8 0.29 39 PPM 287710 10:28:07.1 -34:09:45 8.9 0.24 39 7641_Cteatus 10:27:44.7 -34:23:23 14.5 39 Positions are for equinox of date
Star training set for 7641_Cteatus, (2026/03/05 00:30UT) Object RA Dec mag sep mel Bet Cru 12:47:43.1 -59:41:20 1.3 34.27 57 Mu Vel 10:46:46.5 -49:25:13 2.8 15.62 49 PPM 287445 10:13:24.0 -33:01:53 6.5 3.00 40 PPM 287726 10:27:47.5 -34:24:00 7.8 0.29 39 PPM 287710 10:26:55.9 -34:01:42 8.9 0.24 39 7641_Cteatus 10:26:33.6 -34:15:21 14.5 39 Positions are for J2000