Occultation event with (7641) Cteatus, event index number 3238
Regions able to see the event: SAmericaN,SAfrica
Geocentric closest approach at 2026/02/12 00:03:58 UTC
J2000 position of star is 10:38:09.7 -34:46:59
Equinox of date position of star is 10:39:21.6 -34:55:10
Star is 81 degrees from the moon. Moon is 28% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=14.6
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 5.2 per integration for unocculted signal
Expected flux drop is 24% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 14.0 km/sec on the sky relative to the star, or, 16.0 arcsec/hr.
Position angle of asteroid motion is 86.3 degrees
The recommended exposure time corresponds to 17.5 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 44.8 km.
The sky-plane scale is 3157.0 km/arcsec.
Diameter estimates:
76.6 km assuming a 5% albedo, maximum of 5.5 sec for a central chord
31.3 km assuming a 30% albedo, maximum of 2.2 sec for a central chord
Cross-track diameter of 71.8 km used for deployment plan.
Star training set for 7641_Cteatus, (2026/02/12 00:04UT) Object RA Dec mag sep mel Bet Cru 12:49:16.0 -59:49:52 1.3 32.59 54 Mu Vel 10:47:54.1 -49:33:31 2.8 14.72 73 PPM 287986 10:42:03.4 -35:52:43 6.4 1.11 80 PPM 287859 10:36:04.5 -35:13:14 8.2 0.74 82 PPM 287915 10:38:47.6 -35:01:47 9.7 0.16 81 7641_Cteatus 10:39:21.6 -34:55:10 14.6 81 Positions are for equinox of date
Star training set for 7641_Cteatus, (2026/02/12 00:04UT) Object RA Dec mag sep mel Bet Cru 12:47:43.1 -59:41:20 1.3 32.59 54 Mu Vel 10:46:46.5 -49:25:13 2.8 14.72 73 PPM 287986 10:40:51.5 -35:44:30 6.4 1.11 80 PPM 287859 10:34:53.1 -35:05:06 8.2 0.74 82 PPM 287915 10:37:35.9 -34:53:37 9.7 0.16 81 7641_Cteatus 10:38:09.7 -34:46:59 14.6 81 Positions are for J2000