Occultation event with (30705) Idaios, event index number 4302
Regions able to see the event: Europe
Geocentric closest approach at 2026/09/25 03:42:46 UTC
J2000 position of star is 03:51:50.4 +31:15:05
Equinox of date position of star is 03:53:31.1 +31:19:48
Star is 79 degrees from the moon. Moon is 97% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=15.6
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 4.2 per integration for unocculted signal
Expected flux drop is 36% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 8.7 km/sec on the sky relative to the star, or, 9.8 arcsec/hr.
Position angle of asteroid motion is 153.8 degrees
The recommended exposure time corresponds to 10.9 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 24.9 km.
The sky-plane scale is 3189.2 km/arcsec.
Diameter estimates:
48.8 km assuming a 5% albedo, maximum of 5.6 sec for a central chord
19.9 km assuming a 30% albedo, maximum of 2.3 sec for a central chord
Cross-track diameter of 44.5 km used for deployment plan.
Star training set for 30705_Idaios, (2026/09/25 03:43UT) Object RA Dec mag sep mel Aldebaran 04:37:27.5 +16:33:39 0.8 17.83 87 44Zet Per 03:55:49.2 +31:57:39 2.8 0.80 80 PPM 068850 03:53:45.0 +31:14:48 6.3 0.10 79 30705_Idaios 03:53:31.1 +31:19:48 15.6 80 Positions are for equinox of date
Star training set for 30705_Idaios, (2026/09/25 03:43UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 17.83 87 44Zet Per 03:54:07.9 +31:53:01 2.8 0.80 80 PPM 068850 03:52:04.4 +31:10:06 6.3 0.10 79 30705_Idaios 03:51:50.4 +31:15:05 15.6 79 Positions are for J2000