Occultation event with (11429) Demodokus, event index number 3762
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/05/27 00:17:15 UTC
J2000 position of star is 10:10:01.9 +19:49:29
Equinox of date position of star is 10:11:28.9 +19:41:39
Star is 51 degrees from the moon. Moon is 83% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 9.5 per integration for unocculted signal
Expected flux drop is 80% with SNR of 7.6 for the occulted depth (per occulted point)
Apparent velocity is 18.0 km/sec on the sky relative to the star, or, 17.3 arcsec/hr.
Position angle of asteroid motion is 134.3 degrees
The recommended exposure time corresponds to 9.0 km per image.
The 1-sigma error in the time of the event is 1.8 seconds.
The 1-sigma cross-track error in the shadow position is 6.0 km.
The sky-plane scale is 3736.5 km/arcsec.
Diameter estimates:
48.3 km assuming a 5% albedo, maximum of 2.7 sec for a central chord
19.7 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 37.6 km used for deployment plan.
Star training set for 11429_Demodokus, (2026/05/27 00:17UT) Object RA Dec mag sep mel Regulus 10:09:46.5 +11:50:14 1.3 7.87 48 PPM 100194 10:15:56.7 +21:02:08 6.5 1.70 51 PPM 100123 10:10:46.8 +20:12:06 7.2 0.53 52 PPM 127181 10:12:41.5 +19:24:29 9.7 0.40 51 PPM 127183 10:12:44.7 +19:38:27 11.1 0.30 51 11429_Demodoku 10:11:28.9 +19:41:39 16.1 51 Positions are for equinox of date
Star training set for 11429_Demodokus, (2026/05/27 00:17UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 7.87 48 PPM 100194 10:14:29.5 +21:10:03 6.5 1.70 51 PPM 100123 10:09:19.6 +20:19:56 7.2 0.53 52 PPM 127181 10:11:14.7 +19:32:21 9.7 0.40 51 PPM 127183 10:11:17.8 +19:46:19 11.1 0.30 51 11429_Demodoku 10:10:01.9 +19:49:29 16.1 51 Positions are for J2000