Occultation event with (11397) 98XX93, event index number 1734
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/12/30 04:21:01 UTC
J2000 position of star is 13:15:19.3 -27:34:26
Equinox of date position of star is 13:16:45.1 -27:42:39
Star is 162 degrees from the moon. Moon is 76% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 45% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 22.8 km/sec on the sky relative to the star, or, 19.7 arcsec/hr.
Position angle of asteroid motion is 129.2 degrees
The recommended exposure time corresponds to 20.5 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 22.4 km.
The sky-plane scale is 4179.5 km/arcsec.
Diameter estimates:
54.5 km assuming a 5% albedo, aximum of 2.4 sec for a central chord
22.2 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 45.4 km used for deployment plan.
Star training set for 11397_98XX93, (2025/12/30 04:21UT) Object RA Dec mag sep mel Spica 13:26:34.0 -11:17:46 1.0 16.58 164 Iot Cen 13:22:04.1 -36:50:55 2.8 9.21 157 PPM 261317 13:13:04.4 -26:41:21 6.5 1.31 162 PPM 261523 13:21:56.0 -27:32:45 7.8 1.16 163 PPM 261411 13:16:55.8 -27:34:58 9.1 0.13 162 11397_98XX93 13:16:45.1 -27:42:39 16.2 162 Positions are for equinox of date
Star training set for 11397_98XX93, (2025/12/30 04:21UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 16.58 164 Iot Cen 13:20:35.1 -36:42:46 2.8 9.21 157 PPM 261317 13:11:39.1 -26:33:06 6.5 1.31 162 PPM 261523 13:20:29.8 -27:24:36 7.8 1.16 163 PPM 261411 13:15:30.0 -27:26:46 9.1 0.13 162 11397_98XX93 13:15:19.3 -27:34:26 16.2 162 Positions are for J2000