Occultation event with (3240) Laocoon, event index number 1179
Regions able to see the event: SAmericaN,Senegal
Geocentric closest approach at 2025/08/01 05:19:08 UTC
J2000 position of star is 02:42:39.3 +18:13:12
Equinox of date position of star is 02:44:05.3 +18:19:40
Star is 172 degrees from the moon. Moon is 47% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.85 seconds with the standard RECON-QHY system.
SNR of 6.5 per integration for unocculted signal
Expected flux drop is 58% with SNR of 3.8 for the occulted depth (per occulted point)
Apparent velocity is 15.2 km/sec on the sky relative to the star, or, 15.1 arcsec/hr.
The recommended exposure time corresponds to 12.9 km per image.
The 1-sigma error in the time of the event is 2.3 seconds.
The 1-sigma cross-track error in the shadow position is 18.2 km.
The sky-plane scale is 3628.8 km/arcsec.
Diameter estimates:
52.5 km assuming a 5% albedo, aximum of 3.5 sec for a central chord
21.4 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 52.5 km used for deployment plan.
Star training set for 3240_Laocoon, (2025/08/01 05:19UT) Object RA Dec mag sep mel Aldebaran 04:37:23.5 +16:33:31 0.8 27.05 145 Hamal 02:08:37.3 +23:34:56 2.0 9.80 174 36 Ari 02:45:45.1 +17:52:15 6.4 0.60 172 PPM 118466 02:43:28.2 +17:51:53 8.3 0.49 172 PPM 118480 02:44:21.1 +18:00:42 9.7 0.32 172 PPM 118478 02:44:09.9 +18:17:54 10.1 0.03 172 3240_Laocoon 02:44:05.3 +18:19:40 15.8 172 Positions are for equinox of date
Star training set for 3240_Laocoon, (2025/08/01 05:19UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 27.05 145 Hamal 02:07:10.8 +23:27:41 2.0 9.80 174 36 Ari 02:44:19.2 +17:45:49 6.4 0.60 172 PPM 118466 02:42:02.4 +17:45:24 8.3 0.49 172 PPM 118480 02:42:55.2 +17:54:15 9.7 0.32 172 PPM 118478 02:42:43.9 +18:11:26 10.1 0.03 172 3240_Laocoon 02:42:39.3 +18:13:12 15.8 172 Positions are for J2000