Occultation event with (5119) Imbrius, event index number 1239
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/08/17 08:24:01 UTC
J2000 position of star is 03:23:16.4 +35:14:06
Equinox of date position of star is 03:24:54.1 +35:19:29
Star is 16 degrees from the moon. Moon is 37% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=15.8
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 30% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 16.2 km/sec on the sky relative to the star, or, 16.4 arcsec/hr.
Position angle of asteroid motion is 47.3 degrees
The recommended exposure time corresponds to 21.8 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 17.9 km.
The sky-plane scale is 3559.6 km/arcsec.
Diameter estimates:
51.8 km assuming a 5% albedo, aximum of 3.2 sec for a central chord
21.1 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 49.3 km used for deployment plan.
Star training set for 5119_Imbrius, (2025/08/17 08:24UT) Object RA Dec mag sep mel Aldebaran 04:37:23.7 +16:33:31 0.8 24.76 11 Algol 03:09:50.8 +41:03:09 2.1 6.44 22 PPM 068330 03:20:20.5 +34:18:53 5.9 1.38 17 PPM 068328 03:20:14.5 +35:38:26 8.4 1.00 17 PPM 068418 03:25:37.8 +34:58:37 9.7 0.38 16 PPM 068396 03:24:21.9 +35:03:09 11.8 0.29 16 5119_Imbrius 03:24:54.1 +35:19:29 15.8 16 Positions are for equinox of date
Star training set for 5119_Imbrius, (2025/08/17 08:24UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 24.76 11 Algol 03:08:10.1 +40:57:20 2.1 6.44 22 PPM 068330 03:18:43.9 +34:13:22 5.9 1.38 17 PPM 068328 03:18:37.0 +35:32:55 8.4 1.00 17 PPM 068418 03:24:00.3 +34:53:15 9.7 0.38 16 PPM 068396 03:22:44.5 +34:57:45 11.8 0.29 16 5119_Imbrius 03:23:16.4 +35:14:06 15.8 16 Positions are for J2000