Occultation event with (30705) Idaios, event index number 4541
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/01 21:39:05 UTC
J2000 position of star is 03:36:23.5 +32:46:31
Equinox of date position of star is 03:38:04.8 +32:51:44
Star is 71 degrees from the moon. Moon is 50% illuminated.
Stellar brightness G=12.4, 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 16.1 per integration for unocculted signal
Expected flux drop is 93% with SNR of 14.9 for the occulted depth (per occulted point)
Apparent velocity is 16.4 km/sec on the sky relative to the star, or, 20.1 arcsec/hr.
Position angle of asteroid motion is 97.6 degrees
The recommended exposure time corresponds to 2.0 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 28.0 km.
The sky-plane scale is 2935.4 km/arcsec.
Diameter estimates:
48.8 km assuming a 5% albedo, maximum of 3.0 sec for a central chord
19.9 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 44.5 km used for deployment plan.
Star training set for 30705_Idaios, (2026/11/01 21:39UT) Object RA Dec mag sep mel Aldebaran 04:37:27.8 +16:33:40 0.8 21.10 61 44Zet Per 03:55:49.6 +31:57:40 2.8 3.85 67 40 Per 03:44:05.2 +34:02:56 4.8 1.73 69 PPM 068593 03:36:42.0 +32:06:16 7.2 0.81 71 PPM 068655 03:41:04.3 +32:38:31 9.8 0.67 70 PPM 068627 03:38:32.0 +33:11:48 10.7 0.35 71 30705_Idaios 03:38:04.8 +32:51:44 15.2 70 Positions are for equinox of date
Star training set for 30705_Idaios, (2026/11/01 21:39UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 21.10 61 44Zet Per 03:54:07.9 +31:53:01 2.8 3.85 67 40 Per 03:42:22.6 +33:57:54 4.8 1.73 69 PPM 068593 03:35:01.3 +32:00:59 7.2 0.81 71 PPM 068655 03:39:23.0 +32:33:23 9.8 0.67 70 PPM 068627 03:36:50.5 +33:06:35 10.7 0.35 71 30705_Idaios 03:36:23.5 +32:46:31 15.2 71 Positions are for J2000