Occultation event with (48438) 89WJ2, event index number 1327
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/10/01 00:10:45 UTC
J2000 position of star is 04:55:59.7 +01:34:31
Equinox of date position of star is 04:57:19.8 +01:36:52
Star is 136 degrees from the moon. Moon is 60% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=16.1
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 6.9 per integration for unocculted signal
Expected flux drop is 52% with SNR of 3.6 for the occulted depth (per occulted point)
Apparent velocity is 3.3 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
Position angle of asteroid motion is 19.5 degrees
The recommended exposure time corresponds to 6.5 km per image.
The 1-sigma error in the time of the event is 9.4 seconds.
The 1-sigma cross-track error in the shadow position is 8.8 km.
The sky-plane scale is 3290.6 km/arcsec.
Diameter estimates:
40.2 km assuming a 5% albedo, aximum of 12.4 sec for a central chord
16.4 km assuming a 30% albedo, maximum of 5.0 sec for a central chord
Cross-track diameter of 36.1 km used for deployment plan.
Star training set for 48438_89WJ2, (2025/10/01 00:11UT) Object RA Dec mag sep mel Rigel 05:15:46.6 -08:10:26 0.1 10.81 133 67Bet Eri 05:09:07.0 -05:03:18 2.8 7.29 134 10Pi 6Ori 04:59:53.0 +01:45:06 6.0 0.65 136 PPM 148186 04:57:21.1 +01:39:52 6.9 0.05 136 48438_89WJ2 04:57:19.8 +01:36:52 16.1 136 Positions are for equinox of date
Star training set for 48438_89WJ2, (2025/10/01 00:11UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 10.81 133 67Bet Eri 05:07:50.8 -05:05:13 2.8 7.29 134 10Pi 6Ori 04:58:32.8 +01:42:51 6.0 0.65 136 PPM 148186 04:56:01.0 +01:37:32 6.9 0.05 136 48438_89WJ2 04:55:59.7 +01:34:31 16.1 136 Positions are for J2000