Occultation event with (30705) Idaios, event index number 4391
Regions able to see the event: Europe,Japan
Geocentric closest approach at 2026/10/13 20:17:04 UTC
J2000 position of star is 03:46:36.1 +32:12:06
Equinox of date position of star is 03:48:17.4 +32:16:59
Star is 172 degrees from the moon. Moon is 10% illuminated.
Stellar brightness G=16.8, apparent brightess of occulting body is G=15.4
Use an exposure time of 1.55 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 12.4 km/sec on the sky relative to the star, or, 14.7 arcsec/hr.
Position angle of asteroid motion is 115.1 degrees
The recommended exposure time corresponds to 19.2 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 30.6 km.
The sky-plane scale is 3035.4 km/arcsec.
Diameter estimates:
48.8 km assuming a 5% albedo, maximum of 3.9 sec for a central chord
19.9 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 44.5 km used for deployment plan.
Star training set for 30705_Idaios, (2026/10/13 20:17UT) Object RA Dec mag sep mel Aldebaran 04:37:27.6 +16:33:39 0.8 19.26 164 44Zet Per 03:55:49.4 +31:57:39 2.8 1.63 172 38Omi Per 03:46:00.3 +32:22:15 3.7 0.49 172 PPM 068780 03:49:30.3 +32:16:34 6.8 0.26 172 PPM 068758 03:47:29.0 +32:05:53 10.1 0.25 172 30705_Idaios 03:48:17.4 +32:16:59 15.4 172 Positions are for equinox of date
Star training set for 30705_Idaios, (2026/10/13 20:17UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 19.26 164 44Zet Per 03:54:07.9 +31:53:01 2.8 1.63 172 38Omi Per 03:44:19.1 +32:17:17 3.7 0.49 172 PPM 068780 03:47:49.0 +32:11:43 6.8 0.26 172 PPM 068758 03:45:47.9 +32:00:58 10.1 0.25 172 30705_Idaios 03:46:36.1 +32:12:06 15.4 172 Positions are for J2000