Occultation event with (12929) Periboea, event index number 4434
Regions able to see the event: NZ
Geocentric closest approach at 2026/10/18 15:42:29 UTC
J2000 position of star is 06:02:57.7 -18:59:41
Equinox of date position of star is 06:04:07.8 -18:59:49
Star is 130 degrees from the moon. Moon is 50% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 3.6 per integration for unocculted signal
Expected flux drop is 44% with SNR of 1.6 for the occulted depth (per occulted point)
Apparent velocity is 21.1 km/sec on the sky relative to the star, or, 21.2 arcsec/hr.
Position angle of asteroid motion is 1.5 degrees
The recommended exposure time corresponds to 12.7 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 6.9 km.
The sky-plane scale is 3588.9 km/arcsec.
Diameter estimates:
58.9 km assuming a 5% albedo, maximum of 2.8 sec for a central chord
24.0 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 54.1 km used for deployment plan.
Star training set for 12929_Periboea, (2026/10/18 15:42UT) Object RA Dec mag sep mel Sirius 06:46:19.7 -16:45:15 -1.5 10.29 136 2Bet CMa 06:23:52.8 -17:58:16 2.0 4.79 133 19 Lep 06:08:51.6 -19:10:15 4.8 1.13 130 PPM 216669 06:05:31.0 -19:00:23 8.4 0.33 130 PPM 216619 06:03:26.1 -18:56:51 9.6 0.17 130 12929_Periboea 06:04:07.8 -18:59:49 15.6 130 Positions are for equinox of date
Star training set for 12929_Periboea, (2026/10/18 15:42UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:29 -1.5 10.29 136 2Bet CMa 06:22:42.0 -17:57:21 2.0 4.79 133 19 Lep 06:07:41.6 -19:09:55 4.8 1.13 130 PPM 216669 06:04:20.9 -19:00:11 8.4 0.33 130 PPM 216619 06:02:16.0 -18:56:44 9.6 0.17 130 12929_Periboea 06:02:57.7 -18:59:41 15.6 130 Positions are for J2000