Occultation event with (30705) Idaios, event index number 1138
Regions able to see the event: NZ
Geocentric closest approach at 2025/07/14 16:56:31 UTC
J2000 position of star is 01:40:34.0 +06:20:35
Equinox of date position of star is 01:41:54.1 +06:28:17
Star is 46 degrees from the moon. Moon is 84% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=15.9
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 33% with SNR of 1.0 for the occulted depth (per occulted point)
Apparent velocity is 14.7 km/sec on the sky relative to the star, or, 15.1 arcsec/hr.
The recommended exposure time corresponds to 17.7 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 27.7 km.
The sky-plane scale is 3501.6 km/arcsec.
Diameter estimates:
48.8 km assuming a 5% albedo, aximum of 3.3 sec for a central chord
19.9 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 48.8 km used for deployment plan.
Star training set for 30705_Idaios, (2025/07/14 16:57UT) Object RA Dec mag sep mel Aldebaran 04:37:23.3 +16:33:31 0.8 44.05 90 68Omi Cet 02:20:38.3 -02:51:47 2.0 13.44 53 106Nu Psc 01:42:45.8 +05:36:57 4.4 0.88 46 PPM 144799 01:38:01.4 +06:50:50 8.0 1.03 45 PPM 144855 01:41:24.0 +06:30:53 9.2 0.13 46 30705_Idaios 01:41:54.1 +06:28:17 15.9 46 Positions are for equinox of date
Star training set for 30705_Idaios, (2025/07/14 16:57UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 44.05 90 68Omi Cet 02:19:20.8 -02:58:46 2.0 13.44 53 106Nu Psc 01:41:25.9 +05:29:15 4.4 0.88 46 PPM 144799 01:36:41.2 +06:43:04 8.0 1.03 45 PPM 144855 01:40:03.9 +06:23:10 9.2 0.13 46 30705_Idaios 01:40:34.0 +06:20:35 15.9 46 Positions are for J2000