Occultation event with (4792) Lykaon, event index number 3984
Regions able to see the event: SMexico
Geocentric closest approach at 2026/08/11 09:30:49 UTC
J2000 position of star is 04:40:35.0 +22:03:26
Equinox of date position of star is 04:42:10.4 +22:06:25
Star is 49 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 43% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 24.2 km/sec on the sky relative to the star, or, 22.3 arcsec/hr.
Position angle of asteroid motion is 77.2 degrees
The recommended exposure time corresponds to 15.7 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 30.7 km.
The sky-plane scale is 3911.5 km/arcsec.
Diameter estimates:
55.2 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
22.5 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 50.9 km used for deployment plan.
Star training set for 4792_Lykaon, (2026/08/11 09:31UT) Object RA Dec mag sep mel Aldebaran 04:37:27.0 +16:33:38 0.8 5.66 51 3Iot Aur 04:58:43.9 +33:12:20 2.7 11.69 44 PPM 093646 04:39:50.2 +20:44:09 5.9 1.48 50 PPM 093707 04:43:48.2 +22:59:29 7.2 0.96 48 PPM 093655 04:40:34.5 +22:22:34 10.0 0.46 49 PPM 093663 04:41:13.2 +22:04:53 10.4 0.22 49 4792_Lykaon 04:42:10.4 +22:06:25 15.9 49 Positions are for equinox of date
Star training set for 4792_Lykaon, (2026/08/11 09:31UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 5.66 51 3Iot Aur 04:56:59.6 +33:09:57 2.7 11.69 44 PPM 093646 04:38:15.8 +20:41:05 5.9 1.48 50 PPM 093707 04:42:12.2 +22:56:33 7.2 0.96 48 PPM 093655 04:38:58.9 +22:19:31 10.0 0.46 49 PPM 093663 04:39:37.8 +22:01:52 10.4 0.22 49 4792_Lykaon 04:40:35.0 +22:03:26 15.9 49 Positions are for J2000