Occultation event with (4068) Menestheus, event index number 956
Regions able to see the event: Australia
Geocentric closest approach at 2025/05/08 11:37:19 UTC
J2000 position of star is 08:26:20.3 +07:56:09
Equinox of date position of star is 08:27:42.0 +07:51:05
Star is 56 degrees from the moon. Moon is 85% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.85 seconds with the standard RECON-QHY system.
SNR of 6.8 per integration for unocculted signal
Expected flux drop is 42% with SNR of 2.8 for the occulted depth (per occulted point)
Apparent velocity is 20.5 km/sec on the sky relative to the star, or, 21.1 arcsec/hr.
Position angle of asteroid motion is 3.6 degrees
The recommended exposure time corresponds to 17.4 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 3.4 km.
The sky-plane scale is 3502.0 km/arcsec.
Diameter estimates:
71.1 km assuming a 5% albedo, aximum of 3.5 sec for a central chord
29.0 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 71.1 km used for deployment plan.
Star training set for 4068_Menestheus, (2025/05/08 11:37UT) Object RA Dec mag sep mel Pollux 07:46:51.8 +27:57:46 1.1 22.31 69 PPM 154457 08:27:16.3 +07:28:48 5.1 0.39 56 PPM 154469 08:28:05.2 +07:33:58 7.3 0.30 56 PPM 154460 08:27:27.0 +07:55:31 9.1 0.10 56 4068_Menestheu 08:27:42.0 +07:51:05 15.0 56 Positions are for equinox of date
Star training set for 4068_Menestheus, (2025/05/08 11:37UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 22.31 69 PPM 154457 08:25:54.7 +07:33:52 5.1 0.39 56 PPM 154469 08:26:43.6 +07:39:03 7.3 0.30 56 PPM 154460 08:26:05.2 +08:00:35 9.1 0.10 56 4068_Menestheu 08:26:20.3 +07:56:09 15.0 56 Positions are for J2000