Occultation event with (2759) Idomeneus, event index number 1061
Regions able to see the event: Australia
Geocentric closest approach at 2025/06/15 10:39:13 UTC
J2000 position of star is 09:43:55.9 +07:47:29
Equinox of date position of star is 09:45:16.7 +07:40:25
Star is 164 degrees from the moon. Moon is 83% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 3.7 per integration for unocculted signal
Expected flux drop is 48% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 27.6 km/sec on the sky relative to the star, or, 26.0 arcsec/hr.
Position angle of asteroid motion is 352.8 degrees
The recommended exposure time corresponds to 13.8 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 7.1 km.
The sky-plane scale is 3831.3 km/arcsec.
Diameter estimates:
58.6 km assuming a 5% albedo, aximum of 2.1 sec for a central chord
23.9 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 58.6 km used for deployment plan.
Star training set for 2759_Idomeneus, (2025/06/15 10:39UT) Object RA Dec mag sep mel Regulus 10:09:43.5 +11:50:31 1.3 7.32 163 PPM 156172 09:47:30.5 +06:35:24 5.8 1.22 163 PPM 156131 09:45:04.8 +07:50:06 8.1 0.17 165 2759_Idomeneus 09:45:16.7 +07:40:25 15.6 164 Positions are for equinox of date
Star training set for 2759_Idomeneus, (2025/06/15 10:39UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 7.32 163 PPM 156172 09:46:10.1 +06:42:30 5.8 1.22 163 PPM 156131 09:43:43.9 +07:57:09 8.1 0.17 165 2759_Idomeneus 09:43:55.9 +07:47:29 15.6 164 Positions are for J2000