Occultation event with (7641) Cteatus, event index number 3812
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/06/29 21:56:04 UTC
J2000 position of star is 10:37:08.4 -23:20:13
Equinox of date position of star is 10:38:24.5 -23:28:30
Star is 102 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=13.2, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.13 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 85% with SNR of 8.1 for the occulted depth (per occulted point)
Apparent velocity is 27.0 km/sec on the sky relative to the star, or, 25.6 arcsec/hr.
Position angle of asteroid motion is 78.2 degrees
The recommended exposure time corresponds to 3.5 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 45.5 km.
The sky-plane scale is 3808.3 km/arcsec.
Diameter estimates:
76.6 km assuming a 5% albedo, maximum of 2.8 sec for a central chord
31.3 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 71.8 km used for deployment plan.
Star training set for 7641_Cteatus, (2026/06/29 21:56UT) Object RA Dec mag sep mel Spica 13:26:35.6 -11:17:56 1.0 41.76 73 Alphard 09:28:53.4 -08:46:29 2.0 22.20 124 PPM 257864 10:36:13.5 -23:18:49 6.2 0.53 103 PPM 257923 10:38:51.8 -23:31:14 7.4 0.11 102 7641_Cteatus 10:38:24.5 -23:28:30 15.1 102 Positions are for equinox of date
Star training set for 7641_Cteatus, (2026/06/29 21:56UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 41.76 73 Alphard 09:27:35.2 -08:39:30 2.0 22.20 124 PPM 257864 10:34:57.5 -23:10:33 6.2 0.53 103 PPM 257923 10:37:35.7 -23:22:56 7.4 0.11 102 7641_Cteatus 10:37:08.4 -23:20:13 15.1 102 Positions are for J2000