Occultation event with (7641) Cteatus, event index number 3672
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/04/22 05:27:03 UTC
J2000 position of star is 10:10:10.0 -29:19:07
Equinox of date position of star is 10:11:21.8 -29:26:56
Star is 77 degrees from the moon. Moon is 29% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=14.7
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 8.8 per integration for unocculted signal
Expected flux drop is 40% with SNR of 3.5 for the occulted depth (per occulted point)
Apparent velocity is 16.6 km/sec on the sky relative to the star, or, 18.6 arcsec/hr.
Position angle of asteroid motion is 176.5 degrees
The recommended exposure time corresponds to 17.4 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 11.8 km.
The sky-plane scale is 3209.0 km/arcsec.
Diameter estimates:
76.6 km assuming a 5% albedo, maximum of 4.6 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, (2026/04/22 05:27UT) Object RA Dec mag sep mel Bet Cru 12:49:16.6 -59:49:55 1.3 40.29 115 Lam Vel 09:08:57.9 -43:32:23 2.2 18.80 79 PPM 257470 10:19:20.1 -29:07:28 5.3 1.77 78 PPM 257264 10:10:04.3 -29:52:45 8.5 0.51 77 PPM 257293 10:11:13.9 -29:11:18 9.4 0.26 77 7641_Cteatus 10:11:21.8 -29:26:56 14.7 77 Positions are for equinox of date
Star training set for 7641_Cteatus, (2026/04/22 05:27UT) Object RA Dec mag sep mel Bet Cru 12:47:43.1 -59:41:20 1.3 40.29 115 Lam Vel 09:07:59.7 -43:25:57 2.2 18.80 79 PPM 257470 10:18:07.6 -28:59:31 5.3 1.77 78 PPM 257264 10:08:52.7 -29:44:58 8.5 0.51 77 PPM 257293 10:10:02.0 -29:03:30 9.4 0.26 77 7641_Cteatus 10:10:10.0 -29:19:07 14.7 77 Positions are for J2000