Occultation event with (2223) Sarpedon, event index number 4778
Regions able to see the event: SAmericaN,Senegal
Geocentric closest approach at 2026/11/20 03:29:35 UTC
J2000 position of star is 05:33:17.2 +11:20:13
Equinox of date position of star is 05:34:47.0 +11:21:14
Star is 85 degrees from the moon. Moon is 76% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=14.2
Use an exposure time of 1.30 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 12% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 15.7 km/sec on the sky relative to the star, or, 17.5 arcsec/hr.
Position angle of asteroid motion is 67.9 degrees
The recommended exposure time corresponds to 20.4 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 45.1 km.
The sky-plane scale is 3231.4 km/arcsec.
Diameter estimates:
90.4 km assuming a 5% albedo, maximum of 5.8 sec for a central chord
36.9 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 77.5 km used for deployment plan.
Star training set for 2223_Sarpedon, (2026/11/20 03:30UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.7 +07:24:35 0.4 6.68 91 Bellatrix 05:26:34.5 +06:22:18 1.6 5.38 83 PPM 121138 05:36:42.3 +10:15:20 5.7 1.20 86 PPM 121146 05:36:54.6 +10:31:59 7.9 0.97 86 PPM 121093 05:34:40.5 +11:13:09 8.6 0.14 85 2223_Sarpedon 05:34:47.0 +11:21:14 14.2 86 Positions are for equinox of date
Star training set for 2223_Sarpedon, (2026/11/20 03:30UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 6.68 91 Bellatrix 05:25:07.8 +06:20:58 1.6 5.38 83 PPM 121138 05:35:13.2 +10:14:24 5.7 1.20 86 PPM 121146 05:35:25.3 +10:31:03 7.9 0.97 86 PPM 121093 05:33:10.7 +11:12:08 8.6 0.14 85 2223_Sarpedon 05:33:17.2 +11:20:13 14.2 85 Positions are for J2000