Occultation event with (30705) Idaios, event index number 4980
Regions able to see the event: Europe
Geocentric closest approach at 2026/12/01 20:13:22 UTC
J2000 position of star is 03:16:20.3 +32:42:45
Equinox of date position of star is 03:18:00.7 +32:48:37
Star is 111 degrees from the moon. Moon is 44% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.1
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 22% with SNR of 0.6 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 81.8 degrees
The recommended exposure time corresponds to 19.6 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 23.1 km.
The sky-plane scale is 2930.4 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, (2026/12/01 20:13UT) Object RA Dec mag sep mel Aldebaran 04:37:28.1 +16:33:40 0.8 24.20 97 44Zet Per 03:55:49.9 +31:57:41 2.8 8.03 104 PPM 068330 03:20:25.4 +34:19:09 5.9 1.59 110 PPM 068267 03:17:27.5 +32:57:18 6.6 0.19 111 PPM 068288 03:18:15.9 +32:44:06 10.9 0.09 111 30705_Idaios 03:18:00.7 +32:48:37 15.1 111 Positions are for equinox of date
Star training set for 30705_Idaios, (2026/12/01 20:13UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 24.20 97 44Zet Per 03:54:07.9 +31:53:01 2.8 8.03 104 PPM 068330 03:18:43.9 +34:13:22 5.9 1.59 110 PPM 068267 03:15:47.1 +32:51:25 6.6 0.19 111 PPM 068288 03:16:35.6 +32:38:14 10.9 0.09 111 30705_Idaios 03:16:20.3 +32:42:45 15.1 111 Positions are for J2000