Occultation event with (5119) Imbrius, event index number 4328
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/09/30 03:41:12 UTC
J2000 position of star is 06:11:30.8 +37:09:21
Equinox of date position of star is 06:13:20.1 +37:08:52
Star is 41 degrees from the moon. Moon is 85% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=16.0
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 8.8 per integration for unocculted signal
Expected flux drop is 64% with SNR of 5.7 for the occulted depth (per occulted point)
Apparent velocity is 10.3 km/sec on the sky relative to the star, or, 10.0 arcsec/hr.
Position angle of asteroid motion is 65.5 degrees
The recommended exposure time corresponds to 11.9 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 30.9 km.
The sky-plane scale is 3717.2 km/arcsec.
Diameter estimates:
51.8 km assuming a 5% albedo, maximum of 5.0 sec for a central chord
21.1 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 49.3 km used for deployment plan.
Star training set for 5119_Imbrius, (2026/09/30 03:41UT) Object RA Dec mag sep mel Pollux 07:46:57.0 +27:57:34 1.1 21.68 61 34Bet Aur 06:01:29.5 +44:56:50 1.9 8.11 40 40 Aur 06:08:25.8 +38:28:39 5.4 1.65 40 PPM 071363 06:15:19.8 +37:08:59 6.6 0.40 41 PPM 071295 06:11:42.6 +37:04:41 9.1 0.33 41 5119_Imbrius 06:13:20.1 +37:08:52 16.0 41 Positions are for equinox of date
Star training set for 5119_Imbrius, (2026/09/30 03:41UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 21.68 61 34Bet Aur 05:59:31.6 +44:56:51 1.9 8.11 40 40 Aur 06:06:35.1 +38:28:56 5.4 1.65 40 PPM 071363 06:13:30.5 +37:09:33 6.6 0.40 41 PPM 071295 06:09:53.4 +37:05:06 9.1 0.33 41 5119_Imbrius 06:11:30.8 +37:09:21 16.0 41 Positions are for J2000