Occultation event with (7641) Cteatus, event index number 3457
Regions able to see the event: US,SAmericaN,SAfrica,UVa
Geocentric closest approach at 2026/03/18 02:49:03 UTC
J2000 position of star is 10:19:44.5 -33:17:52
Equinox of date position of star is 10:20:55.4 -33:25:48
Star is 140 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=14.5
Use an exposure time of 1.00 seconds with the standard RECON-QHY system.
SNR of 8.1 per integration for unocculted signal
Expected flux drop is 35% with SNR of 2.9 for the occulted depth (per occulted point)
Apparent velocity is 17.2 km/sec on the sky relative to the star, or, 20.0 arcsec/hr.
Position angle of asteroid motion is 131.8 degrees
The recommended exposure time corresponds to 17.2 km per image.
The 1-sigma error in the time of the event is 2.3 seconds.
The 1-sigma cross-track error in the shadow position is 23.7 km.
The sky-plane scale is 3082.9 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 1.8 sec for a central chord
Cross-track diameter of 71.8 km used for deployment plan.
Star training set for 7641_Cteatus, (2026/03/18 02:49UT) Object RA Dec mag sep mel Bet Cru 12:49:16.3 -59:49:53 1.3 35.82 112 Mu Vel 10:47:54.4 -49:33:32 2.8 16.88 125 PPM 287445 10:14:34.4 -33:09:43 6.5 1.35 140 PPM 287577 10:21:24.6 -33:15:40 7.7 0.20 140 7641_Cteatus 10:20:55.4 -33:25:48 14.5 140 Positions are for equinox of date
Star training set for 7641_Cteatus, (2026/03/18 02:49UT) Object RA Dec mag sep mel Bet Cru 12:47:43.1 -59:41:20 1.3 35.82 112 Mu Vel 10:46:46.5 -49:25:13 2.8 16.88 125 PPM 287445 10:13:24.0 -33:01:53 6.5 1.35 140 PPM 287577 10:20:13.6 -33:07:43 7.7 0.20 140 7641_Cteatus 10:19:44.5 -33:17:52 14.5 140 Positions are for J2000