Occultation event with (39264) 00YQ139, event index number 3401
Regions able to see the event: Australia
Geocentric closest approach at 2026/03/11 12:36:33 UTC
J2000 position of star is 12:15:25.4 -11:04:17
Equinox of date position of star is 12:16:46.4 -11:13:01
Star is 74 degrees from the moon. Moon is 49% illuminated.
Stellar brightness G=12.7, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 13.9 per integration for unocculted signal
Expected flux drop is 95% with SNR of 13.2 for the occulted depth (per occulted point)
Apparent velocity is 16.8 km/sec on the sky relative to the star, or, 18.4 arcsec/hr.
Position angle of asteroid motion is 121.5 degrees
The recommended exposure time corresponds to 2.0 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 33.5 km.
The sky-plane scale is 3282.7 km/arcsec.
Diameter estimates:
41.5 km assuming a 5% albedo, maximum of 2.5 sec for a central chord
16.9 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 35.9 km used for deployment plan.
Star training set for 39264_00YQ139, (2026/03/11 12:37UT) Object RA Dec mag sep mel Spica 13:26:34.6 -11:17:50 1.0 17.11 58 4Gam Crv 12:17:09.4 -17:41:14 2.6 6.47 71 PPM 225575 12:16:31.6 -10:27:55 6.1 0.75 74 PPM 225578 12:16:34.8 -11:08:38 9.5 0.09 74 39264_00YQ139 12:16:46.4 -11:13:01 15.9 73 Positions are for equinox of date
Star training set for 39264_00YQ139, (2026/03/11 12:37UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 17.11 58 4Gam Crv 12:15:48.1 -17:32:30 2.6 6.47 71 PPM 225575 12:15:10.6 -10:19:11 6.1 0.75 74 PPM 225578 12:15:13.8 -10:59:54 9.5 0.09 74 39264_00YQ139 12:15:25.4 -11:04:17 15.9 74 Positions are for J2000