Occultation event with (11554) Asios, event index number 4415
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/10/16 07:45:20 UTC
J2000 position of star is 05:28:27.4 +10:40:02
Equinox of date position of star is 05:29:56.5 +10:41:14
Star is 162 degrees from the moon. Moon is 29% illuminated.
Stellar brightness G=16.9, apparent brightess of occulting body is G=16.2
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 3.3 per integration for unocculted signal
Expected flux drop is 34% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 5.1 km/sec on the sky relative to the star, or, 5.0 arcsec/hr.
Position angle of asteroid motion is 44.1 degrees
The recommended exposure time corresponds to 10.3 km per image.
The 1-sigma error in the time of the event is 6.0 seconds.
The 1-sigma cross-track error in the shadow position is 18.6 km.
The sky-plane scale is 3669.0 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, maximum of 9.4 sec for a central chord
19.6 km assuming a 30% albedo, maximum of 3.8 sec for a central chord
Cross-track diameter of 41.6 km used for deployment plan.
Star training set for 11554_Asios, (2026/10/16 07:45UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.4 +07:24:35 0.4 7.36 159 Bellatrix 05:26:34.2 +06:22:18 1.6 4.40 158 PPM 121138 05:36:42.0 +10:15:20 5.7 1.72 162 PPM 121036 05:32:22.5 +10:10:53 7.1 0.78 162 PPM 121003 05:30:29.1 +10:30:56 9.0 0.22 162 PPM 121005 05:30:35.0 +10:40:37 11.1 0.16 162 11554_Asios 05:29:56.5 +10:41:14 16.2 162 Positions are for equinox of date
Star training set for 11554_Asios, (2026/10/16 07:45UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 7.36 159 Bellatrix 05:25:07.8 +06:20:58 1.6 4.40 158 PPM 121138 05:35:13.2 +10:14:24 5.7 1.72 162 PPM 121036 05:30:53.7 +10:09:46 7.1 0.78 162 PPM 121003 05:29:00.2 +10:29:45 9.0 0.22 162 PPM 121005 05:29:05.9 +10:39:26 11.1 0.16 162 11554_Asios 05:28:27.4 +10:40:02 16.2 162 Positions are for J2000