Occultation event with (7641) Cteatus, event index number 3318
Regions able to see the event: SAfrica,Australia
Geocentric closest approach at 2026/02/26 20:12:08 UTC
J2000 position of star is 10:30:01.0 -34:32:54
Equinox of date position of star is 10:31:12.2 -34:40:59
Star is 83 degrees from the moon. Moon is 75% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=14.5
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 15% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 15.8 km/sec on the sky relative to the star, or, 18.3 arcsec/hr.
Position angle of asteroid motion is 108.3 degrees
The recommended exposure time corresponds to 18.9 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 38.4 km.
The sky-plane scale is 3101.1 km/arcsec.
Diameter estimates:
76.6 km assuming a 5% albedo, maximum of 4.9 sec for a central chord
31.3 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 71.8 km used for deployment plan.
Star training set for 7641_Cteatus, (2026/02/26 20:12UT) Object RA Dec mag sep mel Bet Cru 12:49:16.1 -59:49:52 1.3 33.65 115 Mu Vel 10:47:54.2 -49:33:31 2.8 15.19 95 PPM 287986 10:42:03.5 -35:52:44 6.4 2.52 85 PPM 287726 10:28:58.6 -34:32:02 7.8 0.48 82 PPM 287766 10:31:02.8 -34:41:45 9.5 0.03 83 7641_Cteatus 10:31:12.2 -34:40:59 14.5 83 Positions are for equinox of date
Star training set for 7641_Cteatus, (2026/02/26 20:12UT) Object RA Dec mag sep mel Bet Cru 12:47:43.1 -59:41:20 1.3 33.65 115 Mu Vel 10:46:46.5 -49:25:13 2.8 15.19 95 PPM 287986 10:40:51.5 -35:44:30 6.4 2.52 85 PPM 287726 10:27:47.5 -34:24:00 7.8 0.48 82 PPM 287766 10:29:51.6 -34:33:40 9.5 0.03 83 7641_Cteatus 10:30:01.0 -34:32:54 14.5 83 Positions are for J2000