Occultation event with (2759) Idomeneus, event index number 3915
Regions able to see the event: Australia
Geocentric closest approach at 2026/07/31 09:01:05 UTC
J2000 position of star is 12:21:41.9 +05:52:16
Equinox of date position of star is 12:23:03.3 +05:43:25
Star is 145 degrees from the moon. Moon is 97% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 9.1 per integration for unocculted signal
Expected flux drop is 82% with SNR of 7.4 for the occulted depth (per occulted point)
Apparent velocity is 29.9 km/sec on the sky relative to the star, or, 27.6 arcsec/hr.
Position angle of asteroid motion is 109.7 degrees
The recommended exposure time corresponds to 7.5 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 31.4 km.
The sky-plane scale is 3896.0 km/arcsec.
Diameter estimates:
58.9 km assuming a 5% albedo, maximum of 2.0 sec for a central chord
24.0 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 53.7 km used for deployment plan.
Star training set for 2759_Idomeneus, (2026/07/31 09:01UT) Object RA Dec mag sep mel Spica 13:26:35.8 -11:17:57 1.0 23.23 124 Vindemiatrix 13:03:30.0 +10:49:01 2.8 11.22 136 11 Vir 12:11:24.7 +05:39:33 5.7 2.90 148 PPM 158730 12:21:08.8 +05:53:36 8.5 0.50 145 PPM 158754 12:22:34.3 +05:20:35 9.9 0.40 145 PPM 158763 12:23:15.0 +05:22:02 10.3 0.36 145 2759_Idomeneus 12:23:03.3 +05:43:25 15.6 145 Positions are for equinox of date
Star training set for 2759_Idomeneus, (2026/07/31 09:01UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 23.23 124 Vindemiatrix 13:02:10.1 +10:57:33 2.8 11.22 136 11 Vir 12:10:03.2 +05:48:25 5.7 2.90 148 PPM 158730 12:19:47.4 +06:02:27 8.5 0.50 145 PPM 158754 12:21:12.9 +05:29:25 9.9 0.40 145 PPM 158763 12:21:53.6 +05:30:52 10.3 0.36 145 2759_Idomeneus 12:21:41.9 +05:52:16 15.6 145 Positions are for J2000