Occultation event with (30705) Idaios, event index number 4518
Regions able to see the event: Europe
Geocentric closest approach at 2026/10/29 19:31:38 UTC
J2000 position of star is 03:38:18.2 +32:42:50
Equinox of date position of star is 03:39:59.6 +32:48:00
Star is 27 degrees from the moon. Moon is 82% illuminated.
Stellar brightness G=12.9, apparent brightess of occulting body is G=15.2
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 11.6 per integration for unocculted signal
Expected flux drop is 89% with SNR of 10.4 for the occulted depth (per occulted point)
Apparent velocity is 15.9 km/sec on the sky relative to the star, or, 19.4 arcsec/hr.
Position angle of asteroid motion is 99.7 degrees
The recommended exposure time corresponds to 1.9 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 28.8 km.
The sky-plane scale is 2946.9 km/arcsec.
Diameter estimates:
48.8 km assuming a 5% albedo, maximum of 3.1 sec for a central chord
19.9 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 44.5 km used for deployment plan.
Star training set for 30705_Idaios, (2026/10/29 19:32UT) Object RA Dec mag sep mel Aldebaran 04:37:27.8 +16:33:40 0.8 20.79 19 44Zet Per 03:55:49.5 +31:57:40 2.8 3.45 24 38Omi Per 03:46:00.5 +32:22:16 3.7 1.34 26 PPM 068708 03:44:09.4 +33:01:20 7.3 0.90 26 PPM 068655 03:41:04.3 +32:38:31 9.8 0.28 27 PPM 068654 03:41:02.7 +32:49:06 10.5 0.22 27 30705_Idaios 03:39:59.6 +32:48:00 15.2 27 Positions are for equinox of date
Star training set for 30705_Idaios, (2026/10/29 19:32UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 20.79 19 44Zet Per 03:54:07.9 +31:53:01 2.8 3.45 24 38Omi Per 03:44:19.1 +32:17:17 3.7 1.34 26 PPM 068708 03:42:27.7 +32:56:18 7.3 0.90 26 PPM 068655 03:39:23.0 +32:33:23 9.8 0.28 27 PPM 068654 03:39:21.3 +32:43:58 10.5 0.22 27 30705_Idaios 03:38:18.2 +32:42:50 15.2 27 Positions are for J2000