Occultation event with (4068) Menestheus, event index number 878
Regions able to see the event: Europe
Geocentric closest approach at 2025/04/02 18:49:49 UTC
J2000 position of star is 08:13:31.6 +06:22:18
Equinox of date position of star is 08:14:52.3 +06:17:38
Star is 54 degrees from the moon. Moon is 25% illuminated.
Stellar brightness G=12.5, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
Expected flux drop is 12% with SNR of 14.9 per integration
Apparent velocity is 9.2 km/sec on the sky relative to the star, or, 10.6 arcsec/hr.
The recommended exposure time corresponds to 1.1 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 47.0 km.
The sky-plane scale is 3119.7 km/arcsec.
Diameter estimates:
70.8 km assuming a 5% albedo, aximum of 7.7 sec for a central chord
28.9 km assuming a 30% albedo, maximum of 3.2 sec for a central chord
Cross-track diameter of 70.8 km used for deployment plan.
Star training set for 4068_Menestheus, (2025/04/02 18:50UT) Object RA Dec mag sep mel Pollux 07:46:51.5 +27:57:47 1.1 22.66 39 PPM 154212 08:18:38.1 +04:08:23 6.5 2.35 55 PPM 154105 08:15:12.6 +06:13:31 7.7 0.11 54 4068_Menestheu 08:14:52.3 +06:17:38 14.7 54 Positions are for equinox of date
Star training set for 4068_Menestheus, (2025/04/02 18:50UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 22.66 39 PPM 154212 08:17:18.4 +04:13:09 6.5 2.35 55 PPM 154105 08:13:51.9 +06:18:12 7.7 0.11 54 4068_Menestheu 08:13:31.6 +06:22:18 14.7 54 Positions are for J2000