Occultation event with (2223) Sarpedon, event index number 1228
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/08/14 07:36:45 UTC
J2000 position of star is 03:26:19.5 +18:09:23
Equinox of date position of star is 03:27:47.1 +18:14:41
Star is 27 degrees from the moon. Moon is 71% illuminated.
Stellar brightness G=12.7, apparent brightess of occulting body is G=14.8
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 13.2 per integration for unocculted signal
Expected flux drop is 88% with SNR of 11.6 for the occulted depth (per occulted point)
Apparent velocity is 13.6 km/sec on the sky relative to the star, or, 12.8 arcsec/hr.
Position angle of asteroid motion is 92.0 degrees
The recommended exposure time corresponds to 1.6 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 42.3 km.
The sky-plane scale is 3811.7 km/arcsec.
Diameter estimates:
90.4 km assuming a 5% albedo, aximum of 6.7 sec for a central chord
36.9 km assuming a 30% albedo, maximum of 2.7 sec for a central chord
Cross-track diameter of 77.5 km used for deployment plan.
Star training set for 2223_Sarpedon, (2025/08/14 07:37UT) Object RA Dec mag sep mel Aldebaran 04:37:23.6 +16:33:31 0.8 16.68 44 44Zet Per 03:55:44.9 +31:57:27 2.8 15.09 37 65 Ari 03:25:55.0 +20:53:33 5.9 2.68 27 PPM 119087 03:28:31.2 +18:50:40 6.6 0.62 28 PPM 119092 03:28:40.3 +18:16:19 9.8 0.21 28 2223_Sarpedon 03:27:47.1 +18:14:41 14.8 28 Positions are for equinox of date
Star training set for 2223_Sarpedon, (2025/08/14 07:37UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 16.68 44 44Zet Per 03:54:07.9 +31:53:01 2.8 15.09 37 65 Ari 03:24:26.1 +20:48:12 5.9 2.68 27 PPM 119087 03:27:03.3 +18:45:23 6.6 0.62 28 PPM 119092 03:27:12.6 +18:11:03 9.8 0.21 28 2223_Sarpedon 03:26:19.5 +18:09:23 14.8 27 Positions are for J2000