Occultation event with (7641) Cteatus, event index number 748
Regions able to see the event: Europe
Geocentric closest approach at 2025/03/02 17:22:54 UTC
J2000 position of star is 07:47:47.3 -18:42:49
Equinox of date position of star is 07:48:54.6 -18:46:39
Star is 102 degrees from the moon. Moon is 10% illuminated.
Stellar brightness G=12.6, apparent brightess of occulting body is G=14.6
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
Expected flux drop is 14% with SNR of 13.9 per integration
Apparent velocity is 13.2 km/sec on the sky relative to the star, or, 15.2 arcsec/hr.
The recommended exposure time corresponds to 1.6 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 35.2 km.
The sky-plane scale is 3107.9 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, (2025/03/02 17:23UT) Object RA Dec mag sep mel Sirius 06:46:15.4 -16:45:08 -1.5 15.05 87 15Rho Pup 08:08:37.0 -24:22:42 2.8 7.23 107 PPM 219262 07:51:12.5 -19:35:19 6.1 0.98 103 PPM 219163 07:47:04.3 -18:58:03 7.6 0.47 102 PPM 219210 07:49:13.7 -18:51:43 9.3 0.11 102 7641_Cteatus 07:48:54.6 -18:46:39 14.6 102 Positions are for equinox of date
Star training set for 7641_Cteatus, (2025/03/02 17:23UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 15.05 87 15Rho Pup 08:07:32.5 -24:18:14 2.8 7.23 107 PPM 219262 07:50:05.6 -19:31:24 6.1 0.98 103 PPM 219163 07:45:57.3 -18:54:16 7.6 0.47 102 PPM 219210 07:48:06.5 -18:47:53 9.3 0.11 102 7641_Cteatus 07:47:47.3 -18:42:49 14.6 102 Positions are for J2000