Occultation event with (4068) Menestheus, event index number 3612
Regions able to see the event: Australia,NZ
Geocentric closest approach at 2026/04/11 12:31:56 UTC
J2000 position of star is 10:57:34.6 +04:02:36
Equinox of date position of star is 10:58:56.0 +03:54:08
Star is 142 degrees from the moon. Moon is 37% illuminated.
Stellar brightness G=14.1, apparent brightess of occulting body is G=14.4
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 9.4 per integration for unocculted signal
Expected flux drop is 56% with SNR of 5.2 for the occulted depth (per occulted point)
Apparent velocity is 11.7 km/sec on the sky relative to the star, or, 14.6 arcsec/hr.
Position angle of asteroid motion is 137.1 degrees
The recommended exposure time corresponds to 4.1 km per image.
The 1-sigma error in the time of the event is 3.0 seconds.
The 1-sigma cross-track error in the shadow position is 26.9 km.
The sky-plane scale is 2879.1 km/arcsec.
Diameter estimates:
71.4 km assuming a 5% albedo, maximum of 6.1 sec for a central chord
29.2 km assuming a 30% albedo, maximum of 2.5 sec for a central chord
Cross-track diameter of 67.6 km used for deployment plan.
Star training set for 4068_Menestheus, (2026/04/11 12:32UT) Object RA Dec mag sep mel Regulus 10:09:46.1 +11:50:16 1.3 14.52 157 58 Leo 11:01:55.0 +03:28:33 4.8 0.86 141 PPM 157418 11:01:58.7 +03:35:52 7.5 0.82 141 PPM 157383 10:59:44.8 +04:24:55 10.0 0.55 142 PPM 157381 10:59:21.6 +03:48:33 10.7 0.14 142 4068_Menestheu 10:58:56.0 +03:54:08 14.4 142 Positions are for equinox of date
Star training set for 4068_Menestheus, (2026/04/11 12:32UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 14.52 157 58 Leo 11:00:33.7 +03:37:02 4.8 0.86 141 PPM 157418 11:00:37.4 +03:44:21 7.5 0.82 141 PPM 157383 10:58:23.3 +04:33:23 10.0 0.55 142 PPM 157381 10:58:00.1 +03:57:01 10.7 0.14 142 4068_Menestheu 10:57:34.6 +04:02:36 14.4 142 Positions are for J2000