Occultation event with (30705) Idaios, event index number 1331
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/10/02 08:30:36 UTC
J2000 position of star is 01:29:44.6 +07:41:47
Equinox of date position of star is 01:31:05.6 +07:49:43
Star is 77 degrees from the moon. Moon is 73% illuminated.
Stellar brightness G=14.3, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 9.2 per integration for unocculted signal
Expected flux drop is 64% with SNR of 5.9 for the occulted depth (per occulted point)
Apparent velocity is 16.5 km/sec on the sky relative to the star, or, 21.0 arcsec/hr.
Position angle of asteroid motion is 84.3 degrees
The recommended exposure time corresponds to 6.6 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 20.0 km.
The sky-plane scale is 2831.6 km/arcsec.
Diameter estimates:
48.8 km assuming a 5% albedo, aximum 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, (2025/10/02 08:31UT) Object RA Dec mag sep mel Aldebaran 04:37:24.1 +16:33:32 0.8 46.25 122 6Bet Ari 01:56:04.1 +20:55:58 2.6 14.43 88 PPM 144653 01:30:23.9 +07:25:35 6.4 0.44 76 PPM 144642 01:29:44.2 +08:05:39 7.2 0.43 77 PPM 144696 01:32:29.9 +07:49:41 9.7 0.35 77 PPM 144676 01:31:47.2 +07:56:24 10.9 0.20 77 30705_Idaios 01:31:05.6 +07:49:43 15.0 77 Positions are for equinox of date
Star training set for 30705_Idaios, (2025/10/02 08:31UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 46.25 122 6Bet Ari 01:54:38.6 +20:48:26 2.6 14.43 88 PPM 144653 01:29:03.0 +07:17:37 6.4 0.44 76 PPM 144642 01:28:23.2 +07:57:42 7.2 0.43 77 PPM 144696 01:31:08.9 +07:41:45 9.7 0.35 77 PPM 144676 01:30:26.2 +07:48:28 10.9 0.20 77 30705_Idaios 01:29:44.6 +07:41:47 15.0 77 Positions are for J2000