Occultation event with (4792) Lykaon, event index number 3856
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/07/18 03:58:40 UTC
J2000 position of star is 04:23:15.2 +21:08:52
Equinox of date position of star is 04:24:49.4 +21:12:28
Star is 99 degrees from the moon. Moon is 18% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 46% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 32.6 km/sec on the sky relative to the star, or, 28.5 arcsec/hr.
Position angle of asteroid motion is 77.1 degrees
The recommended exposure time corresponds to 19.6 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 31.1 km.
The sky-plane scale is 4127.5 km/arcsec.
Diameter estimates:
55.2 km assuming a 5% albedo, maximum of 1.7 sec for a central chord
22.5 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 50.9 km used for deployment plan.
Star training set for 4792_Lykaon, (2026/07/18 03:59UT) Object RA Dec mag sep mel Aldebaran 04:37:26.8 +16:33:38 0.8 5.52 96 44Zet Per 03:55:48.4 +31:57:37 2.8 12.55 103 PPM 093481 04:25:06.5 +21:02:29 5.9 0.18 98 PPM 093455 04:23:56.7 +20:52:55 7.6 0.39 99 PPM 093474 04:24:56.6 +21:14:37 8.9 0.05 98 4792_Lykaon 04:24:49.4 +21:12:28 15.9 98 Positions are for equinox of date
Star training set for 4792_Lykaon, (2026/07/18 03:59UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 5.52 96 44Zet Per 03:54:07.9 +31:53:01 2.8 12.55 103 PPM 093481 04:23:32.4 +20:58:54 5.9 0.18 98 PPM 093455 04:22:22.8 +20:49:16 7.6 0.39 99 PPM 093474 04:23:22.4 +21:11:00 8.9 0.05 98 4792_Lykaon 04:23:15.2 +21:08:52 15.9 99 Positions are for J2000