Occultation event with (48438) 89WJ2, event index number 1676
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/12/13 07:57:36 UTC
J2000 position of star is 04:24:30.6 +01:47:09
Equinox of date position of star is 04:25:51.4 +01:50:38
Star is 120 degrees from the moon. Moon is 36% illuminated.
Stellar brightness G=14.3, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 78% with SNR of 7.8 for the occulted depth (per occulted point)
Apparent velocity is 19.1 km/sec on the sky relative to the star, or, 23.0 arcsec/hr.
Position angle of asteroid motion is 108.0 degrees
The recommended exposure time corresponds to 7.6 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 30.0 km.
The sky-plane scale is 2987.7 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, (2025/12/13 07:58UT) Object RA Dec mag sep mel Aldebaran 04:37:24.8 +16:33:34 0.8 14.99 118 67Bet Eri 05:09:07.6 -05:03:17 2.8 12.82 109 PPM 147584 04:29:52.7 +01:26:11 5.5 1.08 119 PPM 147528 04:26:46.0 +02:16:31 8.0 0.49 120 PPM 147503 04:25:20.6 +02:01:48 10.3 0.23 121 48438_89WJ2 04:25:51.4 +01:50:38 15.7 120 Positions are for equinox of date
Star training set for 48438_89WJ2, (2025/12/13 07:58UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 14.99 118 67Bet Eri 05:07:50.8 -05:05:13 2.8 12.82 109 PPM 147584 04:28:32.1 +01:22:50 5.5 1.08 119 PPM 147528 04:25:24.9 +02:13:04 8.0 0.49 120 PPM 147503 04:23:59.7 +01:58:18 10.3 0.23 121 48438_89WJ2 04:24:30.6 +01:47:09 15.7 120 Positions are for J2000