Occultation event with (48438) 89WJ2, event index number 4806
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/21 23:03:37 UTC
J2000 position of star is 06:51:18.6 +21:50:05
Equinox of date position of star is 06:52:55.3 +21:48:04
Star is 79 degrees from the moon. Moon is 90% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=16.0
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 35% with SNR of 1.0 for the occulted depth (per occulted point)
Apparent velocity is 13.0 km/sec on the sky relative to the star, or, 14.9 arcsec/hr.
Position angle of asteroid motion is 125.4 degrees
The recommended exposure time corresponds to 15.6 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 33.3 km.
The sky-plane scale is 3133.8 km/arcsec.
Diameter estimates:
40.2 km assuming a 5% albedo, maximum of 3.1 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, (2026/11/21 23:04UT) Object RA Dec mag sep mel Pollux 07:46:57.5 +27:57:32 1.1 13.70 89 Alhena 06:39:15.9 +16:22:26 1.9 6.31 76 36 Gem 06:53:09.7 +21:43:37 5.3 0.09 79 PPM 096547 06:49:24.1 +21:39:35 8.2 0.83 78 36 Gem 06:53:09.7 +21:43:37 5.3 0.09 79 48438_89WJ2 06:52:55.3 +21:48:04 16.0 79 Positions are for equinox of date
Star training set for 48438_89WJ2, (2026/11/21 23:04UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 13.70 89 Alhena 06:37:42.8 +16:23:56 1.9 6.31 76 36 Gem 06:51:33.0 +21:45:39 5.3 0.09 79 PPM 096547 06:47:47.5 +21:41:28 8.2 0.83 78 36 Gem 06:51:33.0 +21:45:39 5.3 0.09 79 48438_89WJ2 06:51:18.6 +21:50:05 16.0 79 Positions are for J2000