Occultation event with (7641) Cteatus, event index number 802
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/03/11 22:39:55 UTC
J2000 position of star is 07:45:47.7 -17:57:55
Equinox of date position of star is 07:46:55.4 -18:01:41
Star is 46 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=14.6
Use an exposure time of 1.55 seconds with the standard RECON-QHY system.
Expected flux drop is 74% with SNR of 6.3 per integration
Apparent velocity is 12.1 km/sec on the sky relative to the star, or, 13.8 arcsec/hr.
The recommended exposure time corresponds to 18.8 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 37.3 km.
The sky-plane scale is 3164.6 km/arcsec.
Diameter estimates:
75.9 km assuming a 5% albedo, aximum of 6.3 sec for a central chord
31.0 km assuming a 30% albedo, maximum of 2.6 sec for a central chord
Cross-track diameter of 75.9 km used for deployment plan.
Star training set for 7641_Cteatus, (2025/03/11 22:40UT) Object RA Dec mag sep mel Sirius 06:46:15.5 -16:45:08 -1.5 14.52 57 15Rho Pup 08:08:37.0 -24:22:42 2.8 8.11 48 6 Pup 07:50:49.5 -17:17:39 5.2 1.18 45 PPM 219118 07:45:23.4 -17:55:34 8.1 0.38 46 PPM 219142 07:46:25.4 -18:05:51 9.0 0.14 46 7641_Cteatus 07:46:55.4 -18:01:41 14.6 46 Positions are for equinox of date
Star training set for 7641_Cteatus, (2025/03/11 22:40UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 14.52 57 15Rho Pup 08:07:32.5 -24:18:14 2.8 8.11 48 6 Pup 07:49:41.3 -17:13:45 5.2 1.18 45 PPM 219118 07:44:15.7 -17:51:51 8.1 0.38 46 PPM 219142 07:45:17.7 -18:02:06 9.0 0.14 46 7641_Cteatus 07:45:47.7 -17:57:55 14.6 46 Positions are for J2000