Occultation event with (4792) Lykaon, event index number 4432
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/10/18 07:53:14 UTC
J2000 position of star is 04:56:53.4 +23:35:50
Equinox of date position of star is 04:58:30.9 +23:38:14
Star is 144 degrees from the moon. Moon is 47% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.4
Use an exposure time of 1.80 seconds with the standard RECON-QHY system.
SNR of 4.4 per integration for unocculted signal
Expected flux drop is 27% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 6.9 km/sec on the sky relative to the star, or, 7.7 arcsec/hr.
Position angle of asteroid motion is 104.9 degrees
The recommended exposure time corresponds to 12.4 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 35.3 km.
The sky-plane scale is 3218.9 km/arcsec.
Diameter estimates:
55.2 km assuming a 5% albedo, maximum of 8.0 sec for a central chord
22.5 km assuming a 30% albedo, maximum of 3.3 sec for a central chord
Cross-track diameter of 50.9 km used for deployment plan.
Star training set for 4792_Lykaon, (2026/10/18 07:53UT) Object RA Dec mag sep mel Aldebaran 04:37:27.7 +16:33:39 0.8 8.63 138 Alnath 05:27:59.3 +28:37:39 1.6 8.28 151 98 Tau 04:59:48.0 +25:05:21 5.8 1.48 145 PPM 093909 04:58:13.1 +23:20:07 8.5 0.31 144 4792_Lykaon 04:58:30.9 +23:38:14 15.4 145 Positions are for equinox of date
Star training set for 4792_Lykaon, (2026/10/18 07:53UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 8.63 138 Alnath 05:26:17.6 +28:36:22 1.6 8.28 151 98 Tau 04:58:09.4 +25:03:00 5.8 1.48 145 PPM 093909 04:56:35.9 +23:17:42 8.5 0.31 144 4792_Lykaon 04:56:53.4 +23:35:50 15.4 144 Positions are for J2000