Occultation event with (12929) Periboea, event index number 3858
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/07/18 10:19:40 UTC
J2000 position of star is 05:18:58.4 -08:27:29
Equinox of date position of star is 05:20:14.8 -08:25:56
Star is 90 degrees from the moon. Moon is 21% illuminated.
Stellar brightness G=14.9, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 5.5 per integration for unocculted signal
Expected flux drop is 71% with SNR of 3.9 for the occulted depth (per occulted point)
Apparent velocity is 37.8 km/sec on the sky relative to the star, or, 31.6 arcsec/hr.
Position angle of asteroid motion is 107.3 degrees
The recommended exposure time corresponds to 13.2 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 22.6 km.
The sky-plane scale is 4309.4 km/arcsec.
Diameter estimates:
58.9 km assuming a 5% albedo, maximum of 1.6 sec for a central chord
24.0 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 54.1 km used for deployment plan.
Star training set for 12929_Periboea, (2026/07/18 10:20UT) Object RA Dec mag sep mel Rigel 05:15:48.9 -08:10:23 0.1 1.13 92 67Bet Eri 05:09:09.4 -05:03:15 2.8 4.36 93 PPM 188005 05:24:35.0 -08:23:34 6.1 1.07 89 PPM 187910 05:19:17.6 -08:12:06 7.6 0.33 91 12929_Periboea 05:20:14.8 -08:25:56 15.9 90 Positions are for equinox of date
Star training set for 12929_Periboea, (2026/07/18 10:20UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 1.13 92 67Bet Eri 05:07:50.8 -05:05:13 2.8 4.36 93 PPM 188005 05:23:18.6 -08:24:58 6.1 1.07 89 PPM 187910 05:18:01.0 -08:13:41 7.6 0.33 91 12929_Periboea 05:18:58.4 -08:27:29 15.9 90 Positions are for J2000