Occultation event with (7641) Cteatus, event index number 3124
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/01/08 08:51:19 UTC
J2000 position of star is 10:50:06.1 -32:54:36
Equinox of date position of star is 10:51:19.4 -33:02:54
Star is 36 degrees from the moon. Moon is 72% illuminated.
Stellar brightness G=16.8, apparent brightess of occulting body is G=14.8
Use an exposure time of 1.80 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 14% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 13.9 km/sec on the sky relative to the star, or, 14.7 arcsec/hr.
Position angle of asteroid motion is 15.8 degrees
The recommended exposure time corresponds to 24.9 km per image.
The 1-sigma error in the time of the event is 2.9 seconds.
The 1-sigma cross-track error in the shadow position is 22.1 km.
The sky-plane scale is 3396.3 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 2.3 sec for a central chord
Cross-track diameter of 71.8 km used for deployment plan.
Star training set for 7641_Cteatus, (2026/01/08 08:51UT) Object RA Dec mag sep mel Bet Cru 12:49:15.6 -59:49:50 1.3 33.05 64 Mu Vel 10:47:53.9 -49:33:29 2.8 16.52 52 PPM 288177 10:51:10.0 -34:11:48 5.5 1.15 37 PPM 288166 10:50:37.3 -32:26:45 8.4 0.62 36 PPM 288163 10:50:35.3 -32:59:58 9.9 0.16 36 7641_Cteatus 10:51:19.4 -33:02:54 14.8 36 Positions are for equinox of date
Star training set for 7641_Cteatus, (2026/01/08 08:51UT) Object RA Dec mag sep mel Bet Cru 12:47:43.1 -59:41:20 1.3 33.05 64 Mu Vel 10:46:46.5 -49:25:13 2.8 16.52 52 PPM 288177 10:49:57.0 -34:03:30 5.5 1.15 37 PPM 288166 10:49:23.9 -32:18:27 8.4 0.62 36 PPM 288163 10:49:22.0 -32:51:40 9.9 0.16 36 7641_Cteatus 10:50:06.1 -32:54:36 14.8 36 Positions are for J2000