Occultation event with (30705) Idaios, event index number 4229
Regions able to see the event: Europe
Geocentric closest approach at 2026/09/13 02:30:43 UTC
J2000 position of star is 03:52:20.5 +30:29:50
Equinox of date position of star is 03:54:00.5 +30:34:31
Star is 132 degrees from the moon. Moon is 5% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=15.7
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 4.8 per integration for unocculted signal
Expected flux drop is 42% with SNR of 2.0 for the occulted depth (per occulted point)
Apparent velocity is 9.2 km/sec on the sky relative to the star, or, 10.1 arcsec/hr.
Position angle of asteroid motion is 9.5 degrees
The recommended exposure time corresponds to 11.1 km per image.
The 1-sigma error in the time of the event is 3.1 seconds.
The 1-sigma cross-track error in the shadow position is 9.5 km.
The sky-plane scale is 3307.7 km/arcsec.
Diameter estimates:
48.8 km assuming a 5% albedo, maximum of 5.3 sec for a central chord
19.9 km assuming a 30% albedo, maximum of 2.2 sec for a central chord
Cross-track diameter of 44.5 km used for deployment plan.
Star training set for 30705_Idaios, (2026/09/13 02:31UT) Object RA Dec mag sep mel Aldebaran 04:37:27.4 +16:33:39 0.8 17.17 124 44Zet Per 03:55:49.0 +31:57:38 2.8 1.44 132 PPM 068850 03:53:44.9 +31:14:47 6.3 0.67 132 PPM 068828 03:52:32.9 +30:46:12 10.0 0.37 133 PPM 068873 03:54:55.0 +30:35:29 10.6 0.20 132 30705_Idaios 03:54:00.5 +30:34:31 15.7 132 Positions are for equinox of date
Star training set for 30705_Idaios, (2026/09/13 02:31UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 17.17 124 44Zet Per 03:54:07.9 +31:53:01 2.8 1.44 132 PPM 068850 03:52:04.4 +31:10:06 6.3 0.67 132 PPM 068828 03:50:52.8 +30:41:28 10.0 0.37 133 PPM 068873 03:53:14.9 +30:30:49 10.6 0.20 132 30705_Idaios 03:52:20.5 +30:29:50 15.7 132 Positions are for J2000