Occultation event with (48438) 89WJ2, event index number 4574
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/06 01:48:31 UTC
J2000 position of star is 06:55:05.3 +20:59:33
Equinox of date position of star is 06:56:41.2 +20:57:23
Star is 83 degrees from the moon. Moon is 10% illuminated.
Stellar brightness G=10.2, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 53.0 per integration for unocculted signal
Expected flux drop is 100% with SNR of 52.8 for the occulted depth (per occulted point)
Apparent velocity is 7.6 km/sec on the sky relative to the star, or, 8.4 arcsec/hr.
Position angle of asteroid motion is 149.3 degrees
The recommended exposure time corresponds to 0.9 km per image.
The 1-sigma error in the time of the event is 2.4 seconds.
The 1-sigma cross-track error in the shadow position is 28.4 km.
The sky-plane scale is 3273.8 km/arcsec.
Diameter estimates:
40.2 km assuming a 5% albedo, maximum of 5.3 sec for a central chord
16.4 km assuming a 30% albedo, maximum of 2.2 sec for a central chord
Cross-track diameter of 36.1 km used for deployment plan.
Star training set for 48438_89WJ2, (2026/11/06 01:49UT) Object RA Dec mag sep mel Pollux 07:46:57.4 +27:57:33 1.1 13.40 73 Alhena 06:39:15.8 +16:22:26 1.9 6.17 87 36 Gem 06:53:09.5 +21:43:37 5.3 1.13 84 PPM 096714 06:55:57.4 +21:07:30 7.8 0.24 83 48438_89WJ2 06:56:41.2 +20:57:23 16.1 83 Positions are for equinox of date
Star training set for 48438_89WJ2, (2026/11/06 01:49UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 13.40 73 Alhena 06:37:42.8 +16:23:56 1.9 6.17 87 36 Gem 06:51:33.0 +21:45:39 5.3 1.13 84 PPM 096714 06:54:21.4 +21:09:38 7.8 0.24 83 48438_89WJ2 06:55:05.3 +20:59:33 16.1 83 Positions are for J2000