Occultation event with (48438) 89WJ2, event index number 1667
Regions able to see the event: Australia
Geocentric closest approach at 2025/12/11 17:13:14 UTC
J2000 position of star is 04:25:27.6 +01:42:41
Equinox of date position of star is 04:26:48.3 +01:46:08
Star is 102 degrees from the moon. Moon is 52% illuminated.
Stellar brightness G=14.1, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 81% with SNR of 7.9 for the occulted depth (per occulted point)
Apparent velocity is 19.2 km/sec on the sky relative to the star, or, 23.2 arcsec/hr.
Position angle of asteroid motion is 106.9 degrees
The recommended exposure time corresponds to 5.8 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 31.2 km.
The sky-plane scale is 2982.9 km/arcsec.
Diameter estimates:
40.2 km assuming a 5% albedo, aximum of 2.1 sec for a central chord
16.4 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 36.1 km used for deployment plan.
Star training set for 48438_89WJ2, (2025/12/11 17:13UT) Object RA Dec mag sep mel Aldebaran 04:37:24.8 +16:33:33 0.8 15.02 98 67Bet Eri 05:09:07.6 -05:03:17 2.8 12.58 92 PPM 147584 04:29:52.7 +01:26:11 5.5 0.84 102 PPM 147528 04:26:46.0 +02:16:31 8.0 0.51 102 PPM 147548 04:27:46.7 +01:44:08 10.3 0.25 102 48438_89WJ2 04:26:48.3 +01:46:08 15.7 102 Positions are for equinox of date
Star training set for 48438_89WJ2, (2025/12/11 17:13UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 15.02 98 67Bet Eri 05:07:50.8 -05:05:13 2.8 12.58 92 PPM 147584 04:28:32.1 +01:22:50 5.5 0.84 102 PPM 147528 04:25:24.9 +02:13:04 8.0 0.51 102 PPM 147548 04:26:25.9 +01:40:42 10.3 0.25 102 48438_89WJ2 04:25:27.6 +01:42:41 15.7 102 Positions are for J2000