Occultation event with (11252) Laertes, event index number 1663
Regions able to see the event: Europe
Geocentric closest approach at 2025/12/10 00:39:39 UTC
J2000 position of star is 11:52:47.7 +07:06:25
Equinox of date position of star is 11:54:07.6 +06:57:45
Star is 29 degrees from the moon. Moon is 69% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=16.3
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 45% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 16.8 km/sec on the sky relative to the star, or, 15.9 arcsec/hr.
Position angle of asteroid motion is 103.7 degrees
The recommended exposure time corresponds to 17.6 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 28.9 km.
The sky-plane scale is 3803.4 km/arcsec.
Diameter estimates:
44.3 km assuming a 5% albedo, aximum of 2.6 sec for a central chord
18.1 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 41.1 km used for deployment plan.
Star training set for 11252_Laertes, (2025/12/10 00:40UT) Object RA Dec mag sep mel Regulus 10:09:45.1 +11:50:22 1.3 26.19 4 Denebola 11:50:22.9 +14:25:37 2.1 7.52 27 6 Vir 11:56:22.9 +08:17:59 5.6 1.45 30 PPM 158242 11:51:04.3 +06:42:06 8.3 0.80 29 PPM 158276 11:52:59.4 +06:49:58 9.8 0.31 29 PPM 158271 11:52:55.0 +07:01:30 10.9 0.31 29 11252_Laertes 11:54:07.6 +06:57:45 16.3 30 Positions are for equinox of date
Star training set for 11252_Laertes, (2025/12/10 00:40UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 26.19 4 Denebola 11:49:02.7 +14:34:16 2.1 7.52 27 6 Vir 11:55:03.1 +08:26:39 5.6 1.45 30 PPM 158242 11:49:44.4 +06:50:45 8.3 0.80 29 PPM 158276 11:51:39.5 +06:58:38 9.8 0.31 29 PPM 158271 11:51:35.1 +07:10:10 10.9 0.31 29 11252_Laertes 11:52:47.7 +07:06:25 16.3 29 Positions are for J2000