Occultation event with (7641) Cteatus, event index number 880
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/04/03 23:17:59 UTC
J2000 position of star is 07:46:06.2 -15:58:42
Equinox of date position of star is 07:47:15.2 -16:02:29
Star is 51 degrees from the moon. Moon is 38% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=14.8
Use an exposure time of 1.40 seconds with the standard RECON-QHY system.
Expected flux drop is 75% with SNR of 5.0 per integration
Apparent velocity is 13.1 km/sec on the sky relative to the star, or, 14.1 arcsec/hr.
The recommended exposure time corresponds to 18.3 km per image.
The 1-sigma error in the time of the event is 2.3 seconds.
The 1-sigma cross-track error in the shadow position is 37.8 km.
The sky-plane scale is 3343.4 km/arcsec.
Diameter estimates:
75.9 km assuming a 5% albedo, aximum of 5.8 sec for a central chord
31.0 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 75.9 km used for deployment plan.
Star training set for 7641_Cteatus, (2025/04/03 23:18UT) Object RA Dec mag sep mel Sirius 06:46:15.6 -16:45:08 -1.5 14.64 47 15Rho Pup 08:08:37.2 -24:22:43 2.8 9.72 61 PPM 219195 07:48:47.5 -16:03:17 6.1 0.37 52 PPM 219128 07:46:01.6 -16:11:05 8.3 0.33 51 PPM 219165 07:47:07.7 -15:55:07 8.9 0.13 51 7641_Cteatus 07:47:15.2 -16:02:29 14.8 52 Positions are for equinox of date
Star training set for 7641_Cteatus, (2025/04/03 23:18UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 14.64 47 15Rho Pup 08:07:32.5 -24:18:14 2.8 9.72 61 PPM 219195 07:47:38.5 -15:59:27 6.1 0.37 52 PPM 219128 07:44:52.7 -16:07:20 8.3 0.33 51 PPM 219165 07:45:58.6 -15:51:21 8.9 0.13 51 7641_Cteatus 07:46:06.2 -15:58:42 14.8 51 Positions are for J2000