Occultation event with (4722) Agelaos, event index number 1366
Regions able to see the event: Australia
Geocentric closest approach at 2025/10/12 20:14:17 UTC
J2000 position of star is 02:33:07.6 +09:06:41
Equinox of date position of star is 02:34:30.4 +09:13:26
Star is 60 degrees from the moon. Moon is 60% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=14.5
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 8.2 per integration for unocculted signal
Expected flux drop is 37% with SNR of 3.0 for the occulted depth (per occulted point)
Apparent velocity is 14.0 km/sec on the sky relative to the star, or, 18.8 arcsec/hr.
Position angle of asteroid motion is 76.3 degrees
The recommended exposure time corresponds to 12.6 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 28.0 km.
The sky-plane scale is 2667.5 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, aximum of 4.1 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 50.4 km used for deployment plan.
Star training set for 4722_Agelaos, (2025/10/12 20:14UT) Object RA Dec mag sep mel Aldebaran 04:37:24.2 +16:33:32 0.8 30.79 30 Menkar 03:03:37.8 +04:11:22 2.5 8.81 56 PPM 145637 02:30:58.1 +09:40:46 6.5 0.98 61 PPM 145710 02:35:35.9 +09:06:02 7.8 0.30 60 4722_Agelaos 02:34:30.4 +09:13:26 14.5 60 Positions are for equinox of date
Star training set for 4722_Agelaos, (2025/10/12 20:14UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 30.79 30 Menkar 03:02:16.8 +04:05:21 2.5 8.81 56 PPM 145637 02:29:35.3 +09:33:57 6.5 0.98 61 PPM 145710 02:34:13.2 +08:59:19 7.8 0.30 60 4722_Agelaos 02:33:07.6 +09:06:41 14.5 60 Positions are for J2000