Occultation event with (11429) Demodokus, event index number 1735
Regions able to see the event: Australia
Geocentric closest approach at 2025/12/30 18:48:46 UTC
J2000 position of star is 10:50:15.8 +21:04:08
Equinox of date position of star is 10:51:39.7 +20:55:51
Star is 106 degrees from the moon. Moon is 82% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.7
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 7.5 per integration for unocculted signal
Expected flux drop is 45% with SNR of 3.4 for the occulted depth (per occulted point)
Apparent velocity is 4.4 km/sec on the sky relative to the star, or, 4.9 arcsec/hr.
Position angle of asteroid motion is 140.6 degrees
The recommended exposure time corresponds to 8.8 km per image.
The 1-sigma error in the time of the event is 7.5 seconds.
The 1-sigma cross-track error in the shadow position is 1.0 km.
The sky-plane scale is 3261.8 km/arcsec.
Diameter estimates:
48.3 km assuming a 5% albedo, maximum of 11.0 sec for a central chord
19.7 km assuming a 30% albedo, maximum of 4.5 sec for a central chord
Cross-track diameter of 37.6 km used for deployment plan.
Star training set for 11429_Demodokus, (2025/12/30 18:49UT) Object RA Dec mag sep mel Regulus 10:09:45.2 +11:50:21 1.3 13.54 101 68Del Leo 11:15:29.2 +20:22:51 2.6 5.60 111 PPM 100766 10:57:40.6 +22:12:45 6.1 1.90 106 PPM 100701 10:52:51.3 +20:08:09 8.3 0.84 106 PPM 100695 10:52:33.8 +20:41:20 9.7 0.32 106 11429_Demodoku 10:51:39.7 +20:55:51 15.7 106 Positions are for equinox of date
Star training set for 11429_Demodokus, (2025/12/30 18:49UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 13.54 101 68Del Leo 11:14:06.7 +20:31:22 2.6 5.60 111 PPM 100766 10:56:16.8 +22:21:07 6.1 1.90 106 PPM 100701 10:51:27.6 +20:16:27 8.3 0.84 106 PPM 100695 10:51:10.0 +20:49:39 9.7 0.32 106 11429_Demodoku 10:50:15.8 +21:04:08 15.7 106 Positions are for J2000