Occultation event with (4792) Lykaon, event index number 3310
Regions able to see the event: Europe
Geocentric closest approach at 2026/02/25 21:11:50 UTC
J2000 position of star is 02:20:00.0 +11:31:12
Equinox of date position of star is 02:21:24.5 +11:38:21
Star is 49 degrees from the moon. Moon is 65% illuminated.
Stellar brightness G=11.9, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 23.0 per integration for unocculted signal
Expected flux drop is 97% with SNR of 22.4 for the occulted depth (per occulted point)
Apparent velocity is 28.5 km/sec on the sky relative to the star, or, 26.2 arcsec/hr.
Position angle of asteroid motion is 64.7 degrees
The recommended exposure time corresponds to 3.4 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 20.3 km.
The sky-plane scale is 3915.9 km/arcsec.
Diameter estimates:
55.2 km assuming a 5% albedo, maximum of 1.9 sec for a central chord
22.5 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 50.9 km used for deployment plan.
Star training set for 4792_Lykaon, (2026/02/25 21:12UT) Object RA Dec mag sep mel Aldebaran 04:37:25.5 +16:33:35 0.8 33.30 19 6Bet Ari 01:56:05.4 +20:56:05 2.6 11.10 51 24Xi Ari 02:26:13.4 +10:43:40 5.5 1.49 49 PPM 118174 02:24:38.4 +10:57:16 8.4 1.05 49 PPM 118146 02:22:40.4 +11:50:39 9.9 0.37 49 PPM 118116 02:20:10.9 +11:40:11 10.6 0.30 49 4792_Lykaon 02:21:24.5 +11:38:21 15.8 49 Positions are for equinox of date
Star training set for 4792_Lykaon, (2026/02/25 21:12UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 33.30 19 6Bet Ari 01:54:38.6 +20:48:26 2.6 11.10 51 24Xi Ari 02:24:49.1 +10:36:38 5.5 1.49 49 PPM 118174 02:23:14.1 +10:50:12 8.4 1.05 49 PPM 118146 02:21:15.8 +11:43:32 9.9 0.37 49 PPM 118116 02:18:46.3 +11:33:01 10.6 0.30 49 4792_Lykaon 02:20:00.0 +11:31:12 15.8 49 Positions are for J2000