Occultation event with (4060) Deipylos, event index number 1041
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/06/08 22:55:43 UTC
J2000 position of star is 09:12:34.9 +10:49:05
Equinox of date position of star is 09:13:57.4 +10:42:44
Star is 94 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=14.6
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 6.0 per integration for unocculted signal
Expected flux drop is 37% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 29.9 km/sec on the sky relative to the star, or, 30.1 arcsec/hr.
Position angle of asteroid motion is 350.7 degrees
The recommended exposure time corresponds to 19.4 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 7.9 km.
The sky-plane scale is 3573.3 km/arcsec.
Diameter estimates:
79.1 km assuming a 5% albedo, aximum of 2.6 sec for a central chord
32.3 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 79.1 km used for deployment plan.
Star training set for 4060_Deipylos, (2025/06/08 22:56UT) Object RA Dec mag sep mel Regulus 10:09:43.4 +11:50:31 1.3 13.72 82 76Kap Cnc 09:09:07.3 +10:33:52 5.2 1.20 95 PPM 126216 09:14:18.9 +10:33:49 8.0 0.17 94 4060_Deipylos 09:13:57.4 +10:42:44 14.6 94 Positions are for equinox of date
Star training set for 4060_Deipylos, (2025/06/08 22:56UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 13.72 82 76Kap Cnc 09:07:44.8 +10:40:05 5.2 1.20 95 PPM 126216 09:12:56.5 +10:40:10 8.0 0.17 94 4060_Deipylos 09:12:34.9 +10:49:05 14.6 94 Positions are for J2000