Occultation event with (3240) Laocoon, event index number 1065
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/06/16 03:29:10 UTC
J2000 position of star is 02:15:10.9 +15:45:28
Equinox of date position of star is 02:16:34.6 +15:52:31
Star is 75 degrees from the moon. Moon is 78% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 7.4 per integration for unocculted signal
Expected flux drop is 78% with SNR of 5.8 for the occulted depth (per occulted point)
Apparent velocity is 32.9 km/sec on the sky relative to the star, or, 29.2 arcsec/hr.
The recommended exposure time corresponds to 11.5 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 19.1 km.
The sky-plane scale is 4058.2 km/arcsec.
Diameter estimates:
52.5 km assuming a 5% albedo, aximum of 1.6 sec for a central chord
21.4 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 52.5 km used for deployment plan.
Star training set for 3240_Laocoon, (2025/06/16 03:29UT) Object RA Dec mag sep mel Aldebaran 04:37:23.1 +16:33:30 0.8 33.77 108 6Bet Ari 01:56:03.1 +20:55:53 2.6 7.02 73 19 Ari 02:14:26.9 +15:23:53 5.7 0.70 74 PPM 118084 02:17:19.5 +15:56:09 8.3 0.19 75 PPM 118070 02:16:42.1 +15:51:00 11.8 0.04 75 3240_Laocoon 02:16:34.6 +15:52:31 15.9 75 Positions are for equinox of date
Star training set for 3240_Laocoon, (2025/06/16 03:29UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 33.77 108 6Bet Ari 01:54:38.6 +20:48:26 2.6 7.02 73 19 Ari 02:13:03.5 +15:16:47 5.7 0.70 74 PPM 118084 02:15:55.8 +15:49:07 8.3 0.19 75 PPM 118070 02:15:18.4 +15:43:57 11.8 0.04 75 3240_Laocoon 02:15:10.9 +15:45:28 15.9 75 Positions are for J2000