Occultation event with (48438) 89WJ2, event index number 1592
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/11/26 07:19:57 UTC
J2000 position of star is 04:34:50.6 +01:11:24
Equinox of date position of star is 04:36:11.0 +01:14:31
Star is 113 degrees from the moon. Moon is 30% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 47% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 19.0 km/sec on the sky relative to the star, or, 23.1 arcsec/hr.
Position angle of asteroid motion is 98.5 degrees
The recommended exposure time corresponds to 8.6 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 29.1 km.
The sky-plane scale is 2965.5 km/arcsec.
Diameter estimates:
40.2 km assuming a 5% albedo, maximum 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, (2025/11/26 07:20UT) Object RA Dec mag sep mel Rigel 05:15:47.0 -08:10:25 0.1 13.64 118 67Bet Eri 05:09:07.5 -05:03:18 2.8 10.36 118 PPM 147738 04:38:33.9 +01:02:56 5.3 0.63 114 PPM 147660 04:33:44.7 +01:02:00 7.2 0.64 113 PPM 147708 04:37:04.4 +01:29:46 8.8 0.34 114 48438_89WJ2 04:36:11.0 +01:14:31 15.6 114 Positions are for equinox of date
Star training set for 48438_89WJ2, (2025/11/26 07:20UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 13.64 118 67Bet Eri 05:07:50.8 -05:05:13 2.8 10.36 118 PPM 147738 04:37:13.7 +00:59:54 5.3 0.63 114 PPM 147660 04:32:24.4 +00:58:48 7.2 0.64 113 PPM 147708 04:35:43.9 +01:26:41 8.8 0.34 114 48438_89WJ2 04:34:50.6 +01:11:24 15.6 113 Positions are for J2000