Occultation event with (48438) 89WJ2, event index number 1623
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/12/02 00:00:21 UTC
J2000 position of star is 04:31:21.1 +01:20:32
Equinox of date position of star is 04:32:41.5 +01:23:47
Star is 44 degrees from the moon. Moon is 87% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 36% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 19.4 km/sec on the sky relative to the star, or, 23.5 arcsec/hr.
Position angle of asteroid motion is 101.4 degrees
The recommended exposure time corresponds to 14.5 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 29.9 km.
The sky-plane scale is 2965.9 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 0.8 sec for a central chord
Cross-track diameter of 36.1 km used for deployment plan.
Star training set for 48438_89WJ2, (2025/12/02 00:00UT) Object RA Dec mag sep mel Rigel 05:15:47.1 -08:10:25 0.1 14.39 58 67Bet Eri 05:09:07.5 -05:03:18 2.8 11.15 55 PPM 147584 04:29:52.6 +01:26:11 5.5 0.70 44 PPM 147660 04:33:44.7 +01:02:00 7.2 0.45 45 PPM 147658 04:33:37.8 +01:34:49 9.4 0.30 45 PPM 147635 04:32:41.2 +01:18:04 11.2 0.10 44 48438_89WJ2 04:32:41.5 +01:23:47 15.6 45 Positions are for equinox of date
Star training set for 48438_89WJ2, (2025/12/02 00:00UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 14.39 58 67Bet Eri 05:07:50.8 -05:05:13 2.8 11.15 55 PPM 147584 04:28:32.1 +01:22:50 5.5 0.70 44 PPM 147660 04:32:24.4 +00:58:48 7.2 0.45 45 PPM 147658 04:32:17.2 +01:31:36 9.4 0.30 45 PPM 147635 04:31:20.8 +01:14:50 11.2 0.10 44 48438_89WJ2 04:31:21.1 +01:20:32 15.6 44 Positions are for J2000