Occultation event with (7641) Cteatus, event index number 3615
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/04/11 23:26:47 UTC
J2000 position of star is 10:11:17.0 -30:35:05
Equinox of date position of star is 10:12:28.4 -30:42:54
Star is 127 degrees from the moon. Moon is 33% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=14.6
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 9.3 per integration for unocculted signal
Expected flux drop is 62% with SNR of 5.8 for the occulted depth (per occulted point)
Apparent velocity is 16.9 km/sec on the sky relative to the star, or, 19.3 arcsec/hr.
Position angle of asteroid motion is 162.2 degrees
The recommended exposure time corresponds to 5.1 km per image.
The 1-sigma error in the time of the event is 2.7 seconds.
The 1-sigma cross-track error in the shadow position is 1.3 km.
The sky-plane scale is 3152.6 km/arcsec.
Diameter estimates:
76.6 km assuming a 5% albedo, maximum of 4.5 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, (2026/04/11 23:27UT) Object RA Dec mag sep mel Bet Cru 12:49:16.5 -59:49:55 1.3 39.07 89 Lam Vel 09:08:57.9 -43:32:23 2.2 17.96 117 PPM 287271 10:06:56.0 -31:01:13 6.5 1.23 127 PPM 287368 10:11:23.9 -31:01:43 7.7 0.39 127 PPM 287382 10:12:21.4 -30:37:36 9.4 0.09 127 7641_Cteatus 10:12:28.4 -30:42:54 14.6 127 Positions are for equinox of date
Star training set for 7641_Cteatus, (2026/04/11 23:27UT) Object RA Dec mag sep mel Bet Cru 12:47:43.1 -59:41:20 1.3 39.07 89 Lam Vel 09:07:59.7 -43:25:57 2.2 17.96 117 PPM 287271 10:05:45.2 -30:53:30 6.5 1.23 127 PPM 287368 10:10:12.8 -30:53:55 7.7 0.39 127 PPM 287382 10:11:10.0 -30:29:47 9.4 0.09 127 7641_Cteatus 10:11:17.0 -30:35:05 14.6 127 Positions are for J2000