Occultation event with (4060) Deipylos, event index number 1420
Regions able to see the event: Australia
Geocentric closest approach at 2025/10/26 19:15:27 UTC
J2000 position of star is 11:26:12.7 +02:14:58
Equinox of date position of star is 11:27:32.3 +02:06:26
Star is 100 degrees from the moon. Moon is 23% illuminated.
Stellar brightness G=11.7, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 24.6 per integration for unocculted signal
Expected flux drop is 94% with SNR of 23.1 for the occulted depth (per occulted point)
Apparent velocity is 35.8 km/sec on the sky relative to the star, or, 33.6 arcsec/hr.
Position angle of asteroid motion is 107.3 degrees
The recommended exposure time corresponds to 4.3 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 36.3 km.
The sky-plane scale is 3835.3 km/arcsec.
Diameter estimates:
79.8 km assuming a 5% albedo, aximum of 2.2 sec for a central chord
32.6 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 84.0 km used for deployment plan.
Star training set for 4060_Deipylos, (2025/10/26 19:15UT) Object RA Dec mag sep mel Regulus 10:09:44.7 +11:50:24 1.3 21.60 121 Denebola 11:50:22.5 +14:25:40 2.1 13.55 100 83 Leo 11:28:03.7 +02:52:19 6.5 0.78 100 PPM 157821 11:26:04.7 +01:57:16 8.0 0.40 100 PPM 157852 11:27:22.4 +02:18:58 9.4 0.21 100 4060_Deipylos 11:27:32.3 +02:06:26 14.7 99 Positions are for equinox of date
Star training set for 4060_Deipylos, (2025/10/26 19:15UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 21.60 121 Denebola 11:49:02.7 +14:34:16 2.1 13.55 100 83 Leo 11:26:44.1 +03:00:52 6.5 0.78 100 PPM 157821 11:24:45.1 +02:05:48 8.0 0.40 100 PPM 157852 11:26:02.8 +02:27:30 9.4 0.21 100 4060_Deipylos 11:26:12.7 +02:14:58 14.7 100 Positions are for J2000