Occultation event with (5119) Imbrius, event index number 1718
Regions able to see the event: Europe
Geocentric closest approach at 2025/12/24 19:21:51 UTC
J2000 position of star is 02:42:58.7 +35:09:22
Equinox of date position of star is 02:44:34.7 +35:15:55
Star is 83 degrees from the moon. Moon is 20% illuminated.
Stellar brightness G=14.9, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 62% with SNR of 6.1 for the occulted depth (per occulted point)
Apparent velocity is 10.8 km/sec on the sky relative to the star, or, 12.4 arcsec/hr.
Position angle of asteroid motion is 32.8 degrees
The recommended exposure time corresponds to 8.7 km per image.
The 1-sigma error in the time of the event is 2.9 seconds.
The 1-sigma cross-track error in the shadow position is 8.0 km.
The sky-plane scale is 3145.5 km/arcsec.
Diameter estimates:
51.8 km assuming a 5% albedo, aximum of 4.8 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, (2025/12/24 19:22UT) Object RA Dec mag sep mel Aldebaran 04:37:24.9 +16:33:34 0.8 31.33 103 Algol 03:09:52.2 +41:03:14 2.1 7.63 90 17 Per 02:53:07.4 +35:09:54 5.8 1.75 85 PPM 067680 02:45:47.5 +35:13:24 7.2 0.25 83 5119_Imbrius 02:44:34.7 +35:15:55 15.4 83 Positions are for equinox of date
Star training set for 5119_Imbrius, (2025/12/24 19:22UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 31.33 103 Algol 03:08:10.1 +40:57:20 2.1 7.63 90 17 Per 02:51:30.9 +35:03:34 5.8 1.75 85 PPM 067680 02:44:11.4 +35:06:53 7.2 0.25 83 5119_Imbrius 02:42:58.7 +35:09:22 15.4 83 Positions are for J2000