Occultation event with (4068) Menestheus, event index number 3496
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2026/03/25 05:35:54 UTC
J2000 position of star is 11:03:36.5 +02:39:24
Equinox of date position of star is 11:04:57.6 +02:30:54
Star is 79 degrees from the moon. Moon is 44% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=14.1
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 3.5 per integration for unocculted signal
Expected flux drop is 14% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 15.8 km/sec on the sky relative to the star, or, 20.4 arcsec/hr.
Position angle of asteroid motion is 129.7 degrees
The recommended exposure time corresponds to 16.6 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 31.4 km.
The sky-plane scale is 2788.0 km/arcsec.
Diameter estimates:
71.4 km assuming a 5% albedo, maximum of 4.5 sec for a central chord
29.2 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 67.6 km used for deployment plan.
Star training set for 4068_Menestheus, (2026/03/25 05:36UT) Object RA Dec mag sep mel Regulus 10:09:46.0 +11:50:17 1.3 16.55 63 Denebola 11:50:23.8 +14:25:31 2.1 16.36 84 58 Leo 11:01:54.9 +03:28:34 4.8 1.23 78 PPM 157447 11:03:38.8 +02:02:53 7.8 0.57 79 PPM 157478 11:05:45.2 +03:01:17 9.4 0.54 79 PPM 157462 11:04:59.1 +02:35:32 10.9 0.08 79 4068_Menestheu 11:04:57.6 +02:30:54 14.1 80 Positions are for equinox of date
Star training set for 4068_Menestheus, (2026/03/25 05:36UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 16.55 63 Denebola 11:49:02.7 +14:34:16 2.1 16.36 84 58 Leo 11:00:33.7 +03:37:02 4.8 1.23 78 PPM 157447 11:02:17.8 +02:11:22 7.8 0.57 79 PPM 157478 11:04:24.1 +03:09:47 9.4 0.54 79 PPM 157462 11:03:38.0 +02:44:02 10.9 0.08 79 4068_Menestheu 11:03:36.5 +02:39:24 14.1 79 Positions are for J2000