Occultation event with (12929) Periboea, event index number 4108
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/08/27 08:11:50 UTC
J2000 position of star is 05:47:12.0 -11:59:45
Equinox of date position of star is 05:48:26.4 -11:59:17
Star is 115 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.85 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 39% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 30.2 km/sec on the sky relative to the star, or, 27.0 arcsec/hr.
Position angle of asteroid motion is 129.0 degrees
The recommended exposure time corresponds to 25.6 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 15.8 km.
The sky-plane scale is 4021.3 km/arcsec.
Diameter estimates:
58.9 km assuming a 5% albedo, maximum of 2.0 sec for a central chord
24.0 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 54.1 km used for deployment plan.
Star training set for 12929_Periboea, (2026/08/27 08:12UT) Object RA Dec mag sep mel Rigel 05:15:49.2 -08:10:22 0.1 8.89 109 Saiph 05:49:01.3 -09:39:44 2.1 2.33 116 PPM 216329 05:50:49.3 -14:28:40 5.5 2.56 115 PPM 216248 05:47:23.6 -12:16:09 8.4 0.38 115 12929_Periboea 05:48:26.4 -11:59:17 15.9 115 Positions are for equinox of date
Star training set for 12929_Periboea, (2026/08/27 08:12UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 8.89 109 Saiph 05:47:45.4 -09:40:11 2.1 2.33 116 PPM 216329 05:49:36.5 -14:29:03 5.5 2.56 115 PPM 216248 05:46:09.4 -12:16:40 8.4 0.38 115 12929_Periboea 05:47:12.0 -11:59:45 15.9 115 Positions are for J2000