Occultation event with (7641) Cteatus, event index number 4959
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/11/30 09:06:08 UTC
J2000 position of star is 12:57:19.4 -31:05:55
Equinox of date position of star is 12:58:47.6 -31:14:38
Star is 61 degrees from the moon. Moon is 60% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=15.2
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 3.8 per integration for unocculted signal
Expected flux drop is 41% with SNR of 1.6 for the occulted depth (per occulted point)
Apparent velocity is 33.8 km/sec on the sky relative to the star, or, 29.1 arcsec/hr.
Position angle of asteroid motion is 118.1 degrees
The recommended exposure time corresponds to 16.9 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 42.9 km.
The sky-plane scale is 4184.5 km/arcsec.
Diameter estimates:
76.6 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
31.3 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 71.8 km used for deployment plan.
Star training set for 7641_Cteatus, (2026/11/30 09:06UT) Object RA Dec mag sep mel Spica 13:26:36.9 -11:18:03 1.0 20.95 57 Iot Cen 13:22:07.2 -36:51:12 2.8 7.40 68 PPM 290854 13:02:01.6 -33:39:02 6.0 2.50 63 PPM 290771 12:58:16.0 -31:13:39 8.5 0.11 61 PPM 290790 12:59:11.0 -31:14:45 9.7 0.08 61 7641_Cteatus 12:58:47.6 -31:14:38 15.2 62 Positions are for equinox of date
Star training set for 7641_Cteatus, (2026/11/30 09:06UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 20.95 57 Iot Cen 13:20:35.1 -36:42:46 2.8 7.40 68 PPM 290854 13:00:32.5 -33:30:21 6.0 2.50 63 PPM 290771 12:56:47.8 -31:04:57 8.5 0.11 61 PPM 290790 12:57:42.8 -31:06:04 9.7 0.08 61 7641_Cteatus 12:57:19.4 -31:05:55 15.2 61 Positions are for J2000