Occultation event with (4060) Deipylos, event index number 893
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/04/10 00:59:11 UTC
J2000 position of star is 08:39:59.6 +10:02:01
Equinox of date position of star is 08:41:21.8 +09:56:35
Star is 39 degrees from the moon. Moon is 92% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=14.2
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 3.6 per integration for unocculted signal
Expected flux drop is 11% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 8.3 km/sec on the sky relative to the star, or, 10.2 arcsec/hr.
The recommended exposure time corresponds to 16.6 km per image.
The 1-sigma error in the time of the event is 4.0 seconds.
The 1-sigma cross-track error in the shadow position is 28.5 km.
The sky-plane scale is 2921.3 km/arcsec.
Diameter estimates:
79.1 km assuming a 5% albedo, aximum of 9.5 sec for a central chord
32.3 km assuming a 30% albedo, maximum of 3.9 sec for a central chord
Cross-track diameter of 79.1 km used for deployment plan.
Star training set for 4060_Deipylos, (2025/04/10 00:59UT) Object RA Dec mag sep mel Regulus 10:09:42.9 +11:50:34 1.3 21.77 18 36 Cnc 08:38:27.8 +09:33:58 5.9 0.81 40 PPM 154840 08:42:14.2 +09:43:59 7.7 0.30 39 PPM 154820 08:41:16.3 +09:46:23 10.0 0.17 39 4060_Deipylos 08:41:21.8 +09:56:35 14.2 39 Positions are for equinox of date
Star training set for 4060_Deipylos, (2025/04/10 00:59UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 21.77 18 36 Cnc 08:37:05.7 +09:39:20 5.9 0.81 40 PPM 154840 08:40:52.1 +09:49:27 7.7 0.30 39 PPM 154820 08:39:54.2 +09:51:49 10.0 0.17 39 4060_Deipylos 08:39:59.6 +10:02:01 14.2 39 Positions are for J2000