Occultation event with (30705) Idaios, event index number 1673
Regions able to see the event: Australia
Geocentric closest approach at 2025/12/12 16:26:26 UTC
J2000 position of star is 00:59:09.9 +07:31:41
Equinox of date position of star is 01:00:30.9 +07:40:04
Star is 164 degrees from the moon. Moon is 42% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.6
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 4.5 per integration for unocculted signal
Expected flux drop is 30% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 4.2 km/sec on the sky relative to the star, or, 4.8 arcsec/hr.
Position angle of asteroid motion is 154.1 degrees
The recommended exposure time corresponds to 8.4 km per image.
The 1-sigma error in the time of the event is 2.5 seconds.
The 1-sigma cross-track error in the shadow position is 26.9 km.
The sky-plane scale is 3173.7 km/arcsec.
Diameter estimates:
48.8 km assuming a 5% albedo, aximum of 11.6 sec for a central chord
19.9 km assuming a 30% albedo, maximum of 4.7 sec for a central chord
Cross-track diameter of 44.5 km used for deployment plan.
Star training set for 30705_Idaios, (2025/12/12 16:26UT) Object RA Dec mag sep mel Algenib 00:14:34.5 +15:19:40 2.8 13.61 166 71Eps Psc 01:04:17.6 +08:01:45 4.3 1.00 163 PPM 144111 00:59:40.4 +06:59:02 7.9 0.71 164 PPM 144122 01:00:19.7 +07:51:32 8.8 0.20 164 30705_Idaios 01:00:30.9 +07:40:04 15.6 163 Positions are for equinox of date
Star training set for 30705_Idaios, (2025/12/12 16:26UT) Object RA Dec mag sep mel Algenib 00:13:14.2 +15:11:00 2.8 13.61 166 71Eps Psc 01:02:56.5 +07:53:25 4.3 1.00 163 PPM 144111 00:58:19.5 +06:50:39 7.9 0.71 164 PPM 144122 00:58:58.7 +07:43:10 8.8 0.20 164 30705_Idaios 00:59:09.9 +07:31:41 15.6 164 Positions are for J2000