Occultation event with (11252) Laertes, event index number 1185
Regions able to see the event: SMexico
Geocentric closest approach at 2025/04/04 03:57:49 UTC
J2000 position of star is 09:13:18.6 +22:21:22
Equinox of date position of star is 09:14:45.4 +22:15:03
Star is 41 degrees from the moon. Moon is 40% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=16.0
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 6.0 per integration for unocculted signal
Expected flux drop is 45% with SNR of 2.7 for the occulted depth (per occulted point)
Apparent velocity is 2.9 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The recommended exposure time corresponds to 5.8 km per image.
The 1-sigma error in the time of the event is 13.2 seconds.
The 1-sigma cross-track error in the shadow position is 25.7 km.
The sky-plane scale is 3324.6 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, aximum of 15.0 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 6.1 sec for a central chord
Cross-track diameter of 43.8 km used for deployment plan.
Star training set for 11252_Laertes, (2025/04/04 03:58UT) Object RA Dec mag sep mel Regulus 10:09:42.9 +11:50:34 1.3 16.74 57 77Xi Cnc 09:10:48.4 +21:56:30 5.1 0.97 40 PPM 099434 09:16:53.7 +22:42:06 8.1 0.67 41 PPM 099425 09:16:19.7 +22:36:20 9.4 0.51 41 PPM 099407 09:15:18.3 +22:14:40 10.2 0.13 41 11252_Laertes 09:14:45.4 +22:15:03 16.0 41 Positions are for equinox of date
Star training set for 11252_Laertes, (2025/04/04 03:58UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 16.74 57 77Xi Cnc 09:09:21.5 +22:02:44 5.1 0.97 40 PPM 099434 09:15:26.8 +22:48:28 8.1 0.67 41 PPM 099425 09:14:52.7 +22:42:41 9.4 0.51 41 PPM 099407 09:13:51.5 +22:21:00 10.2 0.13 41 11252_Laertes 09:13:18.6 +22:21:22 16.0 41 Positions are for J2000