Occultation event with (7641) Cteatus, event index number 3579
Regions able to see the event: Australia,NZ
Geocentric closest approach at 2026/04/05 14:33:41 UTC
J2000 position of star is 10:12:43.4 -31:21:01
Equinox of date position of star is 10:13:54.5 -31:28:52
Star is 69 degrees from the moon. Moon is 88% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=14.6
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 5.2 per integration for unocculted signal
Expected flux drop is 26% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 17.1 km/sec on the sky relative to the star, or, 19.6 arcsec/hr.
Position angle of asteroid motion is 154.0 degrees
The recommended exposure time corresponds to 17.9 km per image.
The 1-sigma error in the time of the event is 2.6 seconds.
The 1-sigma cross-track error in the shadow position is 6.1 km.
The sky-plane scale is 3125.2 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, (2026/04/05 14:34UT) Object RA Dec mag sep mel Bet Cru 12:49:16.5 -59:49:54 1.3 38.25 45 Lam Vel 09:08:57.8 -43:32:23 2.2 17.58 77 PPM 287271 10:06:56.0 -31:01:13 6.5 1.56 70 PPM 287447 10:14:39.8 -31:40:03 8.4 0.25 68 PPM 287430 10:13:59.6 -31:24:57 9.8 0.07 69 7641_Cteatus 10:13:54.5 -31:28:52 14.6 68 Positions are for equinox of date
Star training set for 7641_Cteatus, (2026/04/05 14:34UT) Object RA Dec mag sep mel Bet Cru 12:47:43.1 -59:41:20 1.3 38.25 45 Lam Vel 09:07:59.7 -43:25:57 2.2 17.58 77 PPM 287271 10:05:45.2 -30:53:30 6.5 1.56 70 PPM 287447 10:13:28.7 -31:32:12 8.4 0.25 68 PPM 287430 10:12:48.4 -31:17:06 9.8 0.07 69 7641_Cteatus 10:12:43.4 -31:21:01 14.6 69 Positions are for J2000