Occultation event with (7641) Cteatus, event index number 906
Regions able to see the event: Europe
Geocentric closest approach at 2025/04/15 18:49:20 UTC
J2000 position of star is 07:49:06.6 -15:02:01
Equinox of date position of star is 07:50:16.3 -15:05:55
Star is 106 degrees from the moon. Moon is 93% illuminated.
Stellar brightness G=13.9, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 9.1 per integration for unocculted signal
Expected flux drop is 71% with SNR of 6.4 for the occulted depth (per occulted point)
Apparent velocity is 15.7 km/sec on the sky relative to the star, or, 16.4 arcsec/hr.
The recommended exposure time corresponds to 3.9 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 32.2 km.
The sky-plane scale is 3448.3 km/arcsec.
Diameter estimates:
76.2 km assuming a 5% albedo, aximum of 4.8 sec for a central chord
31.1 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 76.2 km used for deployment plan.
Star training set for 7641_Cteatus, (2025/04/15 18:49UT) Object RA Dec mag sep mel Sirius 06:46:15.7 -16:45:09 -1.5 15.47 118 15Rho Pup 08:08:37.3 -24:22:43 2.8 10.23 98 4 Pup 07:47:06.7 -14:37:37 5.0 0.90 107 PPM 219239 07:50:22.5 -15:21:41 8.5 0.26 106 7641_Cteatus 07:50:16.3 -15:05:55 14.9 106 Positions are for equinox of date
Star training set for 7641_Cteatus, (2025/04/15 18:49UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 15.47 118 15Rho Pup 08:07:32.5 -24:18:14 2.8 10.23 98 4 Pup 07:45:56.8 -14:33:50 5.0 0.90 107 PPM 219239 07:49:12.9 -15:17:48 8.5 0.26 106 7641_Cteatus 07:49:06.6 -15:02:01 14.9 106 Positions are for J2000