Occultation event with (48438) 89WJ2, event index number 1295
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/09/18 04:47:17 UTC
J2000 position of star is 04:55:17.2 +01:51:22
Equinox of date position of star is 04:56:37.3 +01:53:44
Star is 64 degrees from the moon. Moon is 13% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=16.3
Use an exposure time of 1.50 seconds with the standard RECON-QHY system.
SNR of 7.0 per integration for unocculted signal
Expected flux drop is 59% with SNR of 4.1 for the occulted depth (per occulted point)
Apparent velocity is 5.8 km/sec on the sky relative to the star, or, 6.1 arcsec/hr.
Position angle of asteroid motion is 120.5 degrees
The recommended exposure time corresponds to 8.7 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 31.9 km.
The sky-plane scale is 3418.5 km/arcsec.
Diameter estimates:
40.2 km assuming a 5% albedo, aximum of 6.9 sec for a central chord
16.4 km assuming a 30% albedo, maximum of 2.8 sec for a central chord
Cross-track diameter of 36.1 km used for deployment plan.
Star training set for 48438_89WJ2, (2025/09/18 04:47UT) Object RA Dec mag sep mel Rigel 05:15:46.5 -08:10:26 0.1 11.14 63 67Bet Eri 05:09:06.9 -05:03:18 2.8 7.62 63 8Pi 5Ori 04:55:35.6 +02:28:51 3.7 0.64 64 PPM 148193 04:57:31.2 +02:04:57 7.6 0.29 63 PPM 148174 04:56:57.9 +01:47:16 9.2 0.14 64 48438_89WJ2 04:56:37.3 +01:53:44 16.3 63 Positions are for equinox of date
Star training set for 48438_89WJ2, (2025/09/18 04:47UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 11.14 63 67Bet Eri 05:07:50.8 -05:05:13 2.8 7.62 63 8Pi 5Ori 04:54:15.1 +02:26:26 3.7 0.64 64 PPM 148193 04:56:10.9 +02:02:37 7.6 0.29 63 PPM 148174 04:55:37.8 +01:44:55 9.2 0.14 64 48438_89WJ2 04:55:17.2 +01:51:22 16.3 64 Positions are for J2000