Occultation event with (6997) Laomedon, event index number 1694
Regions able to see the event: SMexico
Geocentric closest approach at 2025/12/18 03:00:06 UTC
J2000 position of star is 02:37:58.2 +03:25:40
Equinox of date position of star is 02:39:19.4 +03:32:20
Star is 149 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=16.2
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 38% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 8.9 km/sec on the sky relative to the star, or, 8.9 arcsec/hr.
Position angle of asteroid motion is 76.9 degrees
The recommended exposure time corresponds to 12.0 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 31.3 km.
The sky-plane scale is 3579.9 km/arcsec.
Diameter estimates:
45.5 km assuming a 5% albedo, maximum of 5.1 sec for a central chord
18.6 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 37.5 km used for deployment plan.
Star training set for 6997_Laomedon, (2025/12/18 03:00UT) Object RA Dec mag sep mel Aldebaran 04:37:24.8 +16:33:34 0.8 31.78 169 Menkar 03:03:38.4 +04:11:24 2.5 6.10 153 78Nu Cet 02:37:14.4 +05:42:19 4.9 2.23 150 PPM 145770 02:39:58.0 +03:33:15 7.1 0.16 149 PPM 145763 02:39:01.3 +03:35:37 10.0 0.09 149 6997_Laomedon 02:39:19.4 +03:32:20 16.2 149 Positions are for equinox of date
Star training set for 6997_Laomedon, (2025/12/18 03:00UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 31.78 169 Menkar 03:02:16.8 +04:05:21 2.5 6.10 153 78Nu Cet 02:35:52.4 +05:35:35 4.9 2.23 150 PPM 145770 02:38:36.8 +03:26:35 7.1 0.16 149 PPM 145763 02:37:40.1 +03:28:56 10.0 0.09 149 6997_Laomedon 02:37:58.2 +03:25:40 16.2 149 Positions are for J2000