Occultation event with (11252) Laertes, event index number 1713
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/12/23 07:59:36 UTC
J2000 position of star is 11:57:24.4 +06:52:57
Equinox of date position of star is 11:58:44.3 +06:44:16
Star is 132 degrees from the moon. Moon is 10% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=16.3
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 9.0 per integration for unocculted signal
Expected flux drop is 73% with SNR of 6.5 for the occulted depth (per occulted point)
Apparent velocity is 10.5 km/sec on the sky relative to the star, or, 10.3 arcsec/hr.
Position angle of asteroid motion is 97.1 degrees
The recommended exposure time corresponds to 10.0 km per image.
The 1-sigma error in the time of the event is 1.8 seconds.
The 1-sigma cross-track error in the shadow position is 31.4 km.
The sky-plane scale is 3651.6 km/arcsec.
Diameter estimates:
44.3 km assuming a 5% albedo, aximum of 4.2 sec for a central chord
18.1 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 41.1 km used for deployment plan.
Star training set for 11252_Laertes, (2025/12/23 08:00UT) Object RA Dec mag sep mel Regulus 10:09:45.2 +11:50:21 1.3 27.35 158 Denebola 11:50:23.0 +14:25:36 2.1 7.96 136 8Pi Vir 12:02:12.2 +06:28:10 4.7 0.90 131 PPM 158368 11:59:05.0 +06:49:47 8.1 0.13 132 11252_Laertes 11:58:44.3 +06:44:16 16.3 131 Positions are for equinox of date
Star training set for 11252_Laertes, (2025/12/23 08:00UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 27.35 158 Denebola 11:49:02.7 +14:34:16 2.1 7.96 136 8Pi Vir 12:00:52.4 +06:36:51 4.7 0.90 131 PPM 158368 11:57:45.1 +06:58:27 8.1 0.13 132 11252_Laertes 11:57:24.4 +06:52:57 16.3 132 Positions are for J2000