Occultation event with (4060) Deipylos, event index number 1103
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/06/29 23:37:35 UTC
J2000 position of star is 09:30:52.0 +10:10:27
Equinox of date position of star is 09:32:14.1 +10:03:40
Star is 16 degrees from the moon. Moon is 24% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 7.2 per integration for unocculted signal
Expected flux drop is 47% with SNR of 3.4 for the occulted depth (per occulted point)
Apparent velocity is 36.0 km/sec on the sky relative to the star, or, 34.5 arcsec/hr.
Position angle of asteroid motion is 348.6 degrees
The recommended exposure time corresponds to 18.0 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 10.2 km.
The sky-plane scale is 3761.7 km/arcsec.
Diameter estimates:
79.1 km assuming a 5% albedo, aximum of 2.2 sec for a central chord
32.3 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 79.1 km used for deployment plan.
Star training set for 4060_Deipylos, (2025/06/29 23:38UT) Object RA Dec mag sep mel Regulus 10:09:43.6 +11:50:30 1.3 9.37 7 5Xi Leo 09:33:19.0 +11:11:08 5.0 1.16 15 PPM 126534 09:32:23.2 +10:02:32 7.6 0.04 16 4060_Deipylos 09:32:14.1 +10:03:40 14.7 15 Positions are for equinox of date
Star training set for 4060_Deipylos, (2025/06/29 23:38UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 9.37 7 5Xi Leo 09:31:56.6 +11:17:57 5.0 1.16 15 PPM 126534 09:31:01.2 +10:09:19 7.6 0.04 16 4060_Deipylos 09:30:52.0 +10:10:27 14.7 16 Positions are for J2000