Occultation event with (48438) 89WJ2, event index number 1279
Regions able to see the event: Europe
Geocentric closest approach at 2025/09/13 00:19:02 UTC
J2000 position of star is 04:54:22.8 +01:57:33
Equinox of date position of star is 04:55:43.0 +01:59:58
Star is 28 degrees from the moon. Moon is 66% illuminated.
Stellar brightness G=12.9, apparent brightess of occulting body is G=16.3
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 11.5 per integration for unocculted signal
Expected flux drop is 96% with SNR of 11.0 for the occulted depth (per occulted point)
Apparent velocity is 8.0 km/sec on the sky relative to the star, or, 8.3 arcsec/hr.
Position angle of asteroid motion is 110.2 degrees
The recommended exposure time corresponds to 1.0 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 31.5 km.
The sky-plane scale is 3472.3 km/arcsec.
Diameter estimates:
40.2 km assuming a 5% albedo, aximum of 5.0 sec for a central chord
16.4 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 36.1 km used for deployment plan.
Star training set for 48438_89WJ2, (2025/09/13 00:19UT) Object RA Dec mag sep mel Rigel 05:15:46.4 -08:10:26 0.1 11.34 39 67Bet Eri 05:09:06.9 -05:03:18 2.8 7.81 35 8Pi 5Ori 04:55:35.5 +02:28:51 3.7 0.48 27 PPM 148193 04:57:31.2 +02:04:57 7.6 0.46 28 PPM 148174 04:56:57.8 +01:47:16 9.2 0.38 28 PPM 148145 04:55:24.4 +01:51:18 10.2 0.16 28 48438_89WJ2 04:55:43.0 +01:59:58 16.3 28 Positions are for equinox of date
Star training set for 48438_89WJ2, (2025/09/13 00:19UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 11.34 39 67Bet Eri 05:07:50.8 -05:05:13 2.8 7.81 35 8Pi 5Ori 04:54:15.1 +02:26:26 3.7 0.48 27 PPM 148193 04:56:10.9 +02:02:37 7.6 0.46 28 PPM 148174 04:55:37.8 +01:44:55 9.2 0.38 28 PPM 148145 04:54:04.3 +01:48:53 10.2 0.16 28 48438_89WJ2 04:54:22.8 +01:57:33 16.3 28 Positions are for J2000