Occultation event with (15398) 97UZ23, event index number 1659
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/12/09 06:25:35 UTC
J2000 position of star is 11:58:54.8 -09:24:01
Equinox of date position of star is 12:00:14.5 -09:32:41
Star is 49 degrees from the moon. Moon is 76% illuminated.
Stellar brightness G=14.1, apparent brightess of occulting body is G=16.5
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 9.5 per integration for unocculted signal
Expected flux drop is 90% with SNR of 8.5 for the occulted depth (per occulted point)
Apparent velocity is 20.0 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
Position angle of asteroid motion is 107.8 degrees
The recommended exposure time corresponds to 6.0 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 33.3 km.
The sky-plane scale is 3766.8 km/arcsec.
Diameter estimates:
39.8 km assuming a 5% albedo, aximum of 2.0 sec for a central chord
16.2 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 35.5 km used for deployment plan.
Star training set for 15398_97UZ23, (2025/12/09 06:26UT) Object RA Dec mag sep mel Spica 13:26:33.8 -11:17:45 1.0 21.29 68 4Gam Crv 12:17:08.6 -17:41:09 2.6 9.12 57 PPM 225208 12:00:29.1 -10:37:12 6.4 1.08 49 PPM 225173 11:59:07.3 -10:18:07 7.6 0.81 49 PPM 195043 12:01:05.4 -09:43:05 9.5 0.27 49 15398_97UZ23 12:00:14.5 -09:32:41 16.5 49 Positions are for equinox of date
Star training set for 15398_97UZ23, (2025/12/09 06:26UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 21.29 68 4Gam Crv 12:15:48.1 -17:32:30 2.6 9.12 57 PPM 225208 11:59:09.3 -10:28:33 6.4 1.08 49 PPM 225173 11:57:47.6 -10:09:27 7.6 0.81 49 PPM 195043 11:59:45.6 -09:34:25 9.5 0.27 49 15398_97UZ23 11:58:54.8 -09:24:01 16.5 49 Positions are for J2000