Occultation event with (5119) Imbrius, event index number 4212
Regions able to see the event: Senegal
Geocentric closest approach at 2026/09/10 04:07:59 UTC
J2000 position of star is 06:02:44.0 +36:37:47
Equinox of date position of star is 06:04:32.6 +36:37:39
Star is 65 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 4.2 per integration for unocculted signal
Expected flux drop is 58% with SNR of 2.4 for the occulted depth (per occulted point)
Apparent velocity is 19.0 km/sec on the sky relative to the star, or, 17.4 arcsec/hr.
Position angle of asteroid motion is 77.6 degrees
The recommended exposure time corresponds to 11.4 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 31.4 km.
The sky-plane scale is 3925.8 km/arcsec.
Diameter estimates:
51.8 km assuming a 5% albedo, maximum of 2.7 sec for a central chord
21.1 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 49.3 km used for deployment plan.
Star training set for 5119_Imbrius, (2026/09/10 04:08UT) Object RA Dec mag sep mel Pollux 07:46:56.8 +27:57:34 1.1 23.22 42 34Bet Aur 06:01:29.3 +44:56:50 1.9 8.34 67 40 Aur 06:08:25.5 +38:28:39 5.4 2.00 65 PPM 071084 06:01:35.6 +36:02:41 7.9 0.83 66 PPM 071147 06:04:53.6 +36:31:09 8.8 0.13 65 5119_Imbrius 06:04:32.6 +36:37:39 16.1 65 Positions are for equinox of date
Star training set for 5119_Imbrius, (2026/09/10 04:08UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 23.22 42 34Bet Aur 05:59:31.6 +44:56:51 1.9 8.34 67 40 Aur 06:06:35.1 +38:28:56 5.4 2.00 65 PPM 071084 05:59:47.6 +36:02:43 7.9 0.83 66 PPM 071147 06:03:05.1 +36:31:19 8.8 0.13 65 5119_Imbrius 06:02:44.0 +36:37:47 16.1 65 Positions are for J2000