Occultation event with (15398) 97UZ23, event index number 3633
Regions able to see the event: Europe
Geocentric closest approach at 2026/04/15 00:03:22 UTC
J2000 position of star is 11:42:28.6 -03:10:52
Equinox of date position of star is 11:43:49.3 -03:19:37
Star is 174 degrees from the moon. Moon is 8% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 4.1 per integration for unocculted signal
Expected flux drop is 53% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 16.5 km/sec on the sky relative to the star, or, 19.9 arcsec/hr.
Position angle of asteroid motion is 139.9 degrees
The recommended exposure time corresponds to 8.2 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 24.5 km.
The sky-plane scale is 2982.0 km/arcsec.
Diameter estimates:
39.8 km assuming a 5% albedo, maximum of 2.4 sec for a central chord
16.2 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 35.5 km used for deployment plan.
Star training set for 15398_97UZ23, (2026/04/15 00:03UT) Object RA Dec mag sep mel Spica 13:26:34.9 -11:17:52 1.0 26.67 148 4Gam Crv 12:17:09.7 -17:41:16 2.6 16.52 157 PPM 194612 11:36:19.4 -04:30:26 6.4 2.21 173 PPM 194752 11:44:10.5 -03:41:29 8.0 0.37 173 PPM 194735 11:43:34.7 -03:20:03 9.4 0.06 174 15398_97UZ23 11:43:49.3 -03:19:37 15.7 173 Positions are for equinox of date
Star training set for 15398_97UZ23, (2026/04/15 00:03UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 26.67 148 4Gam Crv 12:15:48.1 -17:32:30 2.6 16.52 157 PPM 194612 11:34:58.8 -04:21:42 6.4 2.21 173 PPM 194752 11:42:49.8 -03:32:44 8.0 0.37 173 PPM 194735 11:42:14.0 -03:11:18 9.4 0.06 174 15398_97UZ23 11:42:28.6 -03:10:52 15.7 174 Positions are for J2000