Occultation event with (2759) Idomeneus, event index number 968
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/05/12 22:32:40 UTC
J2000 position of star is 09:24:59.5 +07:34:25
Equinox of date position of star is 09:26:20.3 +07:27:48
Star is 93 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.8, apparent brightess of occulting body is G=15.4
Use an exposure time of 1.60 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 23% with SNR of 0.7 for the occulted depth (per occulted point)
Apparent velocity is 15.2 km/sec on the sky relative to the star, or, 15.8 arcsec/hr.
Position angle of asteroid motion is 10.8 degrees
The recommended exposure time corresponds to 24.4 km per image.
The 1-sigma error in the time of the event is 3.4 seconds.
The 1-sigma cross-track error in the shadow position is 9.9 km.
The sky-plane scale is 3479.6 km/arcsec.
Diameter estimates:
58.6 km assuming a 5% albedo, aximum of 3.8 sec for a central chord
23.9 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 58.6 km used for deployment plan.
Star training set for 2759_Idomeneus, (2025/05/12 22:33UT) Object RA Dec mag sep mel Regulus 10:09:43.2 +11:50:32 1.3 11.55 85 2Ome Leo 09:29:48.8 +08:56:42 6.0 1.71 93 PPM 155862 09:29:04.1 +07:15:22 8.3 0.71 93 PPM 155840 09:27:55.2 +07:34:01 8.7 0.41 93 PPM 155812 09:26:19.1 +07:20:27 10.6 0.12 93 2759_Idomeneus 09:26:20.3 +07:27:48 15.4 93 Positions are for equinox of date
Star training set for 2759_Idomeneus, (2025/05/12 22:33UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 11.55 85 2Ome Leo 09:28:27.5 +09:03:24 6.0 1.71 93 PPM 155862 09:27:43.4 +07:22:03 8.3 0.71 93 PPM 155840 09:26:34.4 +07:40:41 8.7 0.41 93 PPM 155812 09:24:58.4 +07:27:05 10.6 0.12 93 2759_Idomeneus 09:24:59.5 +07:34:25 15.4 93 Positions are for J2000