Occultation event with (4722) Agelaos, event index number 4062
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/08/21 03:32:56 UTC
J2000 position of star is 05:06:42.5 +23:03:38
Equinox of date position of star is 05:08:19.2 +23:05:39
Star is 170 degrees from the moon. Moon is 60% illuminated.
Stellar brightness G=13.8, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
SNR of 8.8 per integration for unocculted signal
Expected flux drop is 83% with SNR of 7.3 for the occulted depth (per occulted point)
Apparent velocity is 23.4 km/sec on the sky relative to the star, or, 23.2 arcsec/hr.
Position angle of asteroid motion is 79.2 degrees
The recommended exposure time corresponds to 4.7 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 34.1 km.
The sky-plane scale is 3630.9 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum of 2.5 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 50.4 km used for deployment plan.
Star training set for 4722_Agelaos, (2026/08/21 03:33UT) Object RA Dec mag sep mel Aldebaran 04:37:27.1 +16:33:38 0.8 9.76 169 Alnath 05:27:58.7 +28:37:39 1.6 7.08 167 PPM 094053 05:07:14.4 +23:05:44 6.5 0.25 171 4722_Agelaos 05:08:19.2 +23:05:39 15.5 170 Positions are for equinox of date
Star training set for 4722_Agelaos, (2026/08/21 03:33UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 9.76 169 Alnath 05:26:17.6 +28:36:22 1.6 7.08 167 PPM 094053 05:05:37.7 +23:03:40 6.5 0.25 171 4722_Agelaos 05:06:42.5 +23:03:38 15.5 170 Positions are for J2000