Occultation event with (2223) Sarpedon, event index number 1356
Regions able to see the event: Europe,SAmericaN
Geocentric closest approach at 2025/10/11 03:35:02 UTC
J2000 position of star is 03:27:07.1 +16:32:42
Equinox of date position of star is 03:28:34.5 +16:38:00
Star is 21 degrees from the moon. Moon is 78% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=14.3
Use an exposure time of 1.50 seconds with the standard RECON-QHY system.
SNR of 4.9 per integration for unocculted signal
Expected flux drop is 18% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 12.8 km/sec on the sky relative to the star, or, 14.2 arcsec/hr.
Position angle of asteroid motion is 57.1 degrees
The recommended exposure time corresponds to 19.3 km per image.
The 1-sigma error in the time of the event is 1.8 seconds.
The 1-sigma cross-track error in the shadow position is 36.9 km.
The sky-plane scale is 3246.4 km/arcsec.
Diameter estimates:
90.4 km assuming a 5% albedo, aximum of 7.0 sec for a central chord
36.9 km assuming a 30% albedo, maximum of 2.9 sec for a central chord
Cross-track diameter of 77.5 km used for deployment plan.
Star training set for 2223_Sarpedon, (2025/10/11 03:35UT) Object RA Dec mag sep mel Aldebaran 04:37:24.2 +16:33:32 0.8 16.49 11 Menkar 03:03:37.8 +04:11:21 2.5 13.87 34 PPM 119236 03:39:14.9 +15:30:48 6.4 2.80 20 PPM 119096 03:29:05.6 +16:45:04 8.3 0.17 21 2223_Sarpedon 03:28:34.5 +16:38:00 14.3 21 Positions are for equinox of date
Star training set for 2223_Sarpedon, (2025/10/11 03:35UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 16.49 11 Menkar 03:02:16.8 +04:05:21 2.5 13.87 34 PPM 119236 03:37:47.9 +15:25:49 6.4 2.80 20 PPM 119096 03:27:38.2 +16:39:47 8.3 0.17 21 2223_Sarpedon 03:27:07.1 +16:32:42 14.3 21 Positions are for J2000