Occultation event with (11429) Demodokus, event index number 3518
Regions able to see the event: Australia
Geocentric closest approach at 2026/03/27 12:56:18 UTC
J2000 position of star is 10:10:54.7 +23:06:01
Equinox of date position of star is 10:12:22.2 +22:58:13
Star is 28 degrees from the moon. Moon is 69% illuminated.
Stellar brightness G=13.8, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
SNR of 8.7 per integration for unocculted signal
Expected flux drop is 83% with SNR of 7.2 for the occulted depth (per occulted point)
Apparent velocity is 12.2 km/sec on the sky relative to the star, or, 14.1 arcsec/hr.
Position angle of asteroid motion is 78.2 degrees
The recommended exposure time corresponds to 2.4 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 29.9 km.
The sky-plane scale is 3126.5 km/arcsec.
Diameter estimates:
48.3 km assuming a 5% albedo, maximum of 4.0 sec for a central chord
19.7 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 37.6 km used for deployment plan.
Star training set for 11429_Demodokus, (2026/03/27 12:56UT) Object RA Dec mag sep mel Regulus 10:09:46.0 +11:50:17 1.3 11.15 31 36Zet Leo 10:18:08.7 +23:17:08 3.4 1.36 29 PPM 100140 10:12:04.5 +23:45:05 8.4 0.78 28 PPM 100172 10:14:32.5 +22:44:17 8.6 0.55 29 PPM 100151 10:13:09.7 +22:57:50 11.0 0.18 28 11429_Demodoku 10:12:22.2 +22:58:13 15.5 28 Positions are for equinox of date
Star training set for 11429_Demodokus, (2026/03/27 12:56UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 11.15 31 36Zet Leo 10:16:41.5 +23:25:02 3.4 1.36 29 PPM 100140 10:10:36.7 +23:52:53 8.4 0.78 28 PPM 100172 10:13:05.2 +22:52:08 8.6 0.55 29 PPM 100151 10:11:42.3 +23:05:38 11.0 0.18 28 11429_Demodoku 10:10:54.7 +23:06:01 15.5 28 Positions are for J2000