Occultation event with (7641) Cteatus, event index number 1033
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/06/06 00:53:59 UTC
J2000 position of star is 08:19:14.2 -12:43:55
Equinox of date position of star is 08:20:26.1 -12:48:47
Star is 69 degrees from the moon. Moon is 76% illuminated.
Stellar brightness G=12.9, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 11.5 per integration for unocculted signal
Expected flux drop is 88% with SNR of 10.1 for the occulted depth (per occulted point)
Apparent velocity is 31.3 km/sec on the sky relative to the star, or, 28.9 arcsec/hr.
Position angle of asteroid motion is 1.5 degrees
The recommended exposure time corresponds to 3.8 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 21.5 km.
The sky-plane scale is 3902.0 km/arcsec.
Diameter estimates:
76.2 km assuming a 5% albedo, aximum of 2.4 sec for a central chord
31.1 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 76.2 km used for deployment plan.
Star training set for 7641_Cteatus, (2025/06/06 00:54UT) Object RA Dec mag sep mel Sirius 06:46:16.1 -16:45:09 -1.5 23.09 91 15Rho Pup 08:08:37.6 -24:22:44 2.8 11.90 71 PPM 219933 08:19:36.3 -12:43:11 6.1 0.22 69 7641_Cteatus 08:20:26.1 -12:48:47 15.1 69 Positions are for equinox of date
Star training set for 7641_Cteatus, (2025/06/06 00:54UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 23.09 91 15Rho Pup 08:07:32.5 -24:18:14 2.8 11.90 71 PPM 219933 08:18:24.4 -12:38:21 6.1 0.22 69 7641_Cteatus 08:19:14.2 -12:43:55 15.1 69 Positions are for J2000