Occultation event with (4060) Deipylos, event index number 3897
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2026/07/27 23:24:40 UTC
J2000 position of star is 12:06:44.1 +05:10:38
Equinox of date position of star is 12:08:05.7 +05:01:46
Star is 108 degrees from the moon. Moon is 97% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 25% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 30.4 km/sec on the sky relative to the star, or, 28.1 arcsec/hr.
Position angle of asteroid motion is 110.6 degrees
The recommended exposure time corresponds to 21.3 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 35.6 km.
The sky-plane scale is 3903.7 km/arcsec.
Diameter estimates:
79.8 km assuming a 5% albedo, maximum of 2.6 sec for a central chord
32.6 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 84.0 km used for deployment plan.
Star training set for 4060_Deipylos, (2026/07/27 23:25UT) Object RA Dec mag sep mel Spica 13:26:35.8 -11:17:57 1.0 25.46 83 Denebola 11:50:24.8 +14:25:24 2.1 10.35 115 11 Vir 12:11:24.7 +05:39:33 5.7 1.04 107 PPM 158510 12:07:12.7 +05:12:34 8.0 0.28 108 PPM 158519 12:08:07.5 +05:09:06 9.4 0.12 108 4060_Deipylos 12:08:05.7 +05:01:46 14.9 107 Positions are for equinox of date
Star training set for 4060_Deipylos, (2026/07/27 23:25UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 25.46 83 Denebola 11:49:02.7 +14:34:16 2.1 10.35 115 11 Vir 12:10:03.2 +05:48:25 5.7 1.04 107 PPM 158510 12:05:51.1 +05:21:26 8.0 0.28 108 PPM 158519 12:06:45.9 +05:17:58 9.4 0.12 108 4060_Deipylos 12:06:44.1 +05:10:38 14.9 108 Positions are for J2000