Occultation event with (7641) Cteatus, event index number 439
Regions able to see the event: NZ
Geocentric closest approach at 2025/01/16 13:08:56 UTC
J2000 position of star is 08:10:08.6 -20:15:06
Equinox of date position of star is 08:11:15.2 -20:19:37
Star is 45 degrees from the moon. Moon is 93% illuminated.
Stellar brightness G=13.0, apparent brightess of occulting body is G=14.4
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
Expected flux drop is 21% with SNR of 10.4 per integration
Apparent velocity is 17.6 km/sec on the sky relative to the star, or, 21.0 arcsec/hr.
The recommended exposure time corresponds to 2.1 km per image.
The 1-sigma error in the time of the event is 2.4 seconds.
The 1-sigma cross-track error in the shadow position is 24.2 km.
The sky-plane scale is 3018.9 km/arcsec.
Diameter estimates:
75.9 km assuming a 5% albedo, aximum of 4.3 sec for a central chord
31.0 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 75.9 km used for deployment plan.
Star training set for 7641_Cteatus, (2025/01/16 13:09UT) Object RA Dec mag sep mel Adhara 06:59:36.6 -29:00:27 1.5 18.41 63 15Rho Pup 08:08:36.7 -24:22:40 2.8 4.10 48 PPM 253878 08:08:24.4 -20:37:41 5.5 0.73 45 PPM 254021 08:12:38.8 -20:22:13 8.4 0.33 45 PPM 253962 08:10:52.0 -20:19:58 9.2 0.09 45 7641_Cteatus 08:11:15.2 -20:19:37 14.4 45 Positions are for equinox of date
Star training set for 7641_Cteatus, (2025/01/16 13:09UT) Object RA Dec mag sep mel Adhara 06:58:37.6 -28:58:19 1.5 18.41 63 15Rho Pup 08:07:32.5 -24:18:14 2.8 4.10 48 PPM 253878 08:07:18.0 -20:33:16 5.5 0.73 45 PPM 254021 08:11:32.2 -20:17:39 8.4 0.33 45 PPM 253962 08:09:45.4 -20:15:28 9.2 0.09 45 7641_Cteatus 08:10:08.6 -20:15:06 14.4 45 Positions are for J2000