Occultation event with (11252) Laertes, event index number 1697
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/12/19 09:12:16 UTC
J2000 position of star is 11:56:13.9 +06:55:33
Equinox of date position of star is 11:57:33.8 +06:46:53
Star is 84 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=16.3
Use an exposure time of 0.85 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 48% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 12.4 km/sec on the sky relative to the star, or, 12.0 arcsec/hr.
Position angle of asteroid motion is 99.7 degrees
The recommended exposure time corresponds to 10.5 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 30.5 km.
The sky-plane scale is 3696.7 km/arcsec.
Diameter estimates:
44.3 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
18.1 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 41.1 km used for deployment plan.
Star training set for 11252_Laertes, (2025/12/19 09:12UT) Object RA Dec mag sep mel Regulus 10:09:45.1 +11:50:21 1.3 27.06 110 Denebola 11:50:23.0 +14:25:37 2.1 7.85 90 8Pi Vir 12:02:12.2 +06:28:10 4.7 1.19 83 PPM 158368 11:59:04.9 +06:49:47 8.1 0.38 84 PPM 158351 11:57:52.2 +07:09:09 9.8 0.38 84 PPM 158338 11:57:03.2 +06:43:05 10.3 0.14 84 11252_Laertes 11:57:33.8 +06:46:53 16.3 84 Positions are for equinox of date
Star training set for 11252_Laertes, (2025/12/19 09:12UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 27.06 110 Denebola 11:49:02.7 +14:34:16 2.1 7.85 90 8Pi Vir 12:00:52.4 +06:36:51 4.7 1.19 83 PPM 158368 11:57:45.1 +06:58:27 8.1 0.38 84 PPM 158351 11:56:32.3 +07:17:50 9.8 0.38 84 PPM 158338 11:55:43.3 +06:51:45 10.3 0.14 84 11252_Laertes 11:56:13.9 +06:55:33 16.3 84 Positions are for J2000