Occultation event with (12929) Periboea, event index number 4262
Regions able to see the event: Australia
Geocentric closest approach at 2026/09/18 18:51:16 UTC
J2000 position of star is 05:57:43.0 -14:47:44
Equinox of date position of star is 05:58:55.7 -14:47:40
Star is 137 degrees from the moon. Moon is 49% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.8
Use an exposure time of 1.00 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 35% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 25.5 km/sec on the sky relative to the star, or, 23.9 arcsec/hr.
Position angle of asteroid motion is 147.5 degrees
The recommended exposure time corresponds to 25.5 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 8.4 km.
The sky-plane scale is 3830.0 km/arcsec.
Diameter estimates:
58.9 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
24.0 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 54.1 km used for deployment plan.
Star training set for 12929_Periboea, (2026/09/18 18:51UT) Object RA Dec mag sep mel Sirius 06:46:19.5 -16:45:15 -1.5 11.57 132 Saiph 05:49:01.5 -09:39:44 2.1 5.67 142 16Eta Lep 05:57:37.4 -14:09:53 3.7 0.70 138 PPM 216550 06:00:55.3 -14:42:34 8.5 0.49 137 12929_Periboea 05:58:55.7 -14:47:40 15.8 137 Positions are for equinox of date
Star training set for 12929_Periboea, (2026/09/18 18:51UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:29 -1.5 11.57 132 Saiph 05:47:45.4 -09:40:11 2.1 5.67 142 16Eta Lep 05:56:24.2 -14:10:00 3.7 0.70 138 PPM 216550 05:59:42.5 -14:42:33 8.5 0.49 137 12929_Periboea 05:57:43.0 -14:47:44 15.8 137 Positions are for J2000