Occultation event with (2759) Idomeneus, event index number 1646
Regions able to see the event: NZ
Geocentric closest approach at 2025/12/06 15:39:28 UTC
J2000 position of star is 12:09:52.9 -00:56:29
Equinox of date position of star is 12:11:12.7 -01:05:09
Star is 84 degrees from the moon. Moon is 96% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 4.5 per integration for unocculted signal
Expected flux drop is 49% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 22.6 km/sec on the sky relative to the star, or, 22.1 arcsec/hr.
Position angle of asteroid motion is 99.9 degrees
The recommended exposure time corresponds to 12.4 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 32.8 km.
The sky-plane scale is 3679.8 km/arcsec.
Diameter estimates:
58.9 km assuming a 5% albedo, aximum of 2.6 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 53.7 km used for deployment plan.
Star training set for 2759_Idomeneus, (2025/12/06 15:39UT) Object RA Dec mag sep mel Spica 13:26:33.8 -11:17:45 1.0 21.31 105 Denebola 11:50:22.9 +14:25:37 2.1 16.35 72 13 Vir 12:20:00.1 -00:55:52 5.9 2.20 86 PPM 158596 12:12:45.1 +00:02:58 8.5 1.20 84 PPM 178701 12:11:08.5 -01:09:03 9.6 0.07 84 2759_Idomeneus 12:11:12.7 -01:05:09 15.5 84 Positions are for equinox of date
Star training set for 2759_Idomeneus, (2025/12/06 15:39UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 21.31 105 Denebola 11:49:02.7 +14:34:16 2.1 16.35 72 13 Vir 12:18:40.4 -00:47:14 5.9 2.20 86 PPM 158596 12:11:25.4 +00:11:37 8.5 1.20 84 PPM 178701 12:09:48.7 -01:00:23 9.6 0.07 84 2759_Idomeneus 12:09:52.9 -00:56:29 15.5 84 Positions are for J2000