Occultation event with (21595) 98WJ5, event index number 3244
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/02/14 02:26:11 UTC
J2000 position of star is 12:53:53.0 +13:31:33
Equinox of date position of star is 12:55:11.3 +13:23:05
Star is 100 degrees from the moon. Moon is 12% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 85% with SNR of 8.4 for the occulted depth (per occulted point)
Apparent velocity is 14.9 km/sec on the sky relative to the star, or, 14.9 arcsec/hr.
Position angle of asteroid motion is 155.1 degrees
The recommended exposure time corresponds to 7.4 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 11.5 km.
The sky-plane scale is 3600.4 km/arcsec.
Diameter estimates:
42.1 km assuming a 5% albedo, maximum of 2.8 sec for a central chord
17.2 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 35.2 km used for deployment plan.
Star training set for 21595_98WJ5, (2026/02/14 02:26UT) Object RA Dec mag sep mel Arcturus 14:16:51.3 +19:02:52 0.0 20.39 85 Vindemiatrix 13:03:28.6 +10:49:09 2.8 3.27 97 41 Vir 12:55:08.3 +12:16:36 6.1 1.11 99 PPM 129417 12:54:29.0 +12:19:28 8.1 1.07 99 PPM 129419 12:54:39.9 +13:12:09 9.0 0.22 100 21595_98WJ5 12:55:11.3 +13:23:05 16.4 99 Positions are for equinox of date
Star training set for 21595_98WJ5, (2026/02/14 02:26UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 20.39 85 Vindemiatrix 13:02:10.1 +10:57:33 2.8 3.27 97 41 Vir 12:53:49.8 +12:25:05 6.1 1.11 99 PPM 129417 12:53:10.5 +12:27:58 8.1 1.07 99 PPM 129419 12:53:21.5 +13:20:38 9.0 0.22 100 21595_98WJ5 12:53:53.0 +13:31:33 16.4 100 Positions are for J2000