Occultation event with (21595) 98WJ5, event index number 3333
Regions able to see the event: Australia
Geocentric closest approach at 2026/03/02 20:06:48 UTC
J2000 position of star is 12:49:34.8 +15:04:44
Equinox of date position of star is 12:50:53.3 +14:56:12
Star is 36 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=12.3, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 17.6 per integration for unocculted signal
Expected flux drop is 97% with SNR of 17.1 for the occulted depth (per occulted point)
Apparent velocity is 18.0 km/sec on the sky relative to the star, or, 18.5 arcsec/hr.
Position angle of asteroid motion is 139.2 degrees
The recommended exposure time corresponds to 2.2 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 20.5 km.
The sky-plane scale is 3506.9 km/arcsec.
Diameter estimates:
42.1 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
17.2 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 35.2 km used for deployment plan.
Star training set for 21595_98WJ5, (2026/03/02 20:07UT) Object RA Dec mag sep mel Arcturus 14:16:51.4 +19:02:51 0.0 20.95 56 Vindemiatrix 13:03:28.8 +10:49:09 2.8 5.13 39 29 Com 12:50:12.8 +13:58:49 5.6 0.97 35 PPM 129330 12:48:29.1 +15:26:56 7.3 0.77 35 PPM 129359 12:50:09.8 +15:16:19 9.0 0.38 35 PPM 129363 12:50:15.2 +15:01:42 10.4 0.18 35 21595_98WJ5 12:50:53.3 +14:56:12 16.2 36 Positions are for equinox of date
Star training set for 21595_98WJ5, (2026/03/02 20:07UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 20.95 56 Vindemiatrix 13:02:10.1 +10:57:33 2.8 5.13 39 29 Com 12:48:54.3 +14:07:21 5.6 0.97 35 PPM 129330 12:47:10.6 +15:35:29 7.3 0.77 35 PPM 129359 12:48:51.4 +15:24:51 9.0 0.38 35 PPM 129363 12:48:56.7 +15:10:15 10.4 0.18 35 21595_98WJ5 12:49:34.8 +15:04:44 16.2 36 Positions are for J2000