Occultation event with (48438) 89WJ2, event index number 4783
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/11/20 07:53:59 UTC
J2000 position of star is 06:51:51.9 +21:44:30
Equinox of date position of star is 06:53:28.5 +21:42:27
Star is 101 degrees from the moon. Moon is 77% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 5.8 per integration for unocculted signal
Expected flux drop is 62% with SNR of 3.6 for the occulted depth (per occulted point)
Apparent velocity is 12.5 km/sec on the sky relative to the star, or, 14.2 arcsec/hr.
Position angle of asteroid motion is 126.7 degrees
The recommended exposure time corresponds to 8.7 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 33.1 km.
The sky-plane scale is 3146.6 km/arcsec.
Diameter estimates:
40.2 km assuming a 5% albedo, maximum of 3.2 sec for a central chord
16.4 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 36.1 km used for deployment plan.
Star training set for 48438_89WJ2, (2026/11/20 07:54UT) Object RA Dec mag sep mel Pollux 07:46:57.5 +27:57:32 1.1 13.64 112 Alhena 06:39:15.9 +16:22:26 1.9 6.30 98 36 Gem 06:53:09.6 +21:43:37 5.3 0.08 101 PPM 096714 06:55:57.5 +21:07:30 7.8 0.82 102 36 Gem 06:53:09.6 +21:43:37 5.3 0.08 101 48438_89WJ2 06:53:28.5 +21:42:27 16.0 101 Positions are for equinox of date
Star training set for 48438_89WJ2, (2026/11/20 07:54UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 13.64 112 Alhena 06:37:42.8 +16:23:56 1.9 6.30 98 36 Gem 06:51:33.0 +21:45:39 5.3 0.08 101 PPM 096714 06:54:21.4 +21:09:38 7.8 0.82 102 36 Gem 06:51:33.0 +21:45:39 5.3 0.08 101 48438_89WJ2 06:51:51.9 +21:44:30 16.0 101 Positions are for J2000