Occultation event with (2223) Sarpedon, event index number 3919
Regions able to see the event: US
Geocentric closest approach at 2026/08/01 09:40:01 UTC
J2000 position of star is 05:12:24.1 +15:49:15
Equinox of date position of star is 05:13:55.8 +15:51:03
Star is 97 degrees from the moon. Moon is 92% illuminated.
Stellar brightness G=15.0, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 6.8 per integration for unocculted signal
Expected flux drop is 49% with SNR of 3.4 for the occulted depth (per occulted point)
Apparent velocity is 31.4 km/sec on the sky relative to the star, or, 26.3 arcsec/hr.
Position angle of asteroid motion is 95.6 degrees
The recommended exposure time corresponds to 18.8 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 45.2 km.
The sky-plane scale is 4297.6 km/arcsec.
Diameter estimates:
90.4 km assuming a 5% albedo, maximum of 2.9 sec for a central chord
36.9 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 77.5 km used for deployment plan.
Star training set for 2223_Sarpedon, (2026/08/01 09:40UT) Object RA Dec mag sep mel Aldebaran 04:37:26.9 +16:33:38 0.8 8.79 89 Bellatrix 05:26:33.5 +06:22:17 1.6 9.97 100 PPM 120692 05:13:13.3 +16:04:34 5.2 0.28 97 PPM 120671 05:12:11.2 +15:18:37 8.3 0.68 97 PPM 120710 05:13:54.7 +15:56:48 8.8 0.10 97 2223_Sarpedon 05:13:55.8 +15:51:03 15.0 98 Positions are for equinox of date
Star training set for 2223_Sarpedon, (2026/08/01 09:40UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 8.79 89 Bellatrix 05:25:07.8 +06:20:58 1.6 9.97 100 PPM 120692 05:11:41.6 +16:02:45 5.2 0.28 97 PPM 120671 05:10:40.0 +15:16:45 8.3 0.68 97 PPM 120710 05:12:23.0 +15:55:00 8.8 0.10 97 2223_Sarpedon 05:12:24.1 +15:49:15 15.0 97 Positions are for J2000