Occultation event with (21601) 98XO89, event index number 3443
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/03/16 03:20:16 UTC
J2000 position of star is 13:47:17.0 -31:19:31
Equinox of date position of star is 13:48:47.3 -31:27:18
Star is 101 degrees from the moon. Moon is 10% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=15.2
Use an exposure time of 1.30 seconds with the standard RECON-QHY system.
SNR of 7.1 per integration for unocculted signal
Expected flux drop is 41% with SNR of 2.9 for the occulted depth (per occulted point)
Apparent velocity is 10.3 km/sec on the sky relative to the star, or, 11.4 arcsec/hr.
Position angle of asteroid motion is 92.6 degrees
The recommended exposure time corresponds to 13.4 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 35.8 km.
The sky-plane scale is 3259.1 km/arcsec.
Diameter estimates:
60.0 km assuming a 5% albedo, maximum of 5.8 sec for a central chord
24.5 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 54.9 km used for deployment plan.
Star training set for 21601_98XO89, (2026/03/16 03:20UT) Object RA Dec mag sep mel Spica 13:26:34.6 -11:17:50 1.0 20.80 115 5The Cen 14:08:14.1 -36:29:51 2.1 6.45 96 4 Cen 13:54:43.5 -32:03:21 4.4 1.40 100 PPM 291840 13:49:54.0 -30:52:45 8.2 0.62 102 PPM 291852 13:50:30.1 -31:30:43 9.0 0.37 101 PPM 291804 13:48:11.9 -31:39:10 10.1 0.23 102 21601_98XO89 13:48:47.3 -31:27:18 15.2 101 Positions are for equinox of date
Star training set for 21601_98XO89, (2026/03/16 03:20UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 20.80 115 5The Cen 14:06:39.9 -36:22:25 2.1 6.45 96 4 Cen 13:53:12.5 -31:55:39 4.4 1.40 100 PPM 291840 13:48:23.9 -30:44:58 8.2 0.62 102 PPM 291852 13:48:59.6 -31:22:56 9.0 0.37 101 PPM 291804 13:46:41.6 -31:31:21 10.1 0.23 102 21601_98XO89 13:47:17.0 -31:19:31 15.2 101 Positions are for J2000