Occultation event with (11554) Asios, event index number 4377
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/10/10 10:02:34 UTC
J2000 position of star is 05:28:48.2 +10:48:37
Equinox of date position of star is 05:30:17.3 +10:49:48
Star is 111 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=16.4, 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 5.2 per integration for unocculted signal
Expected flux drop is 46% with SNR of 2.4 for the occulted depth (per occulted point)
Apparent velocity is 3.9 km/sec on the sky relative to the star, or, 3.7 arcsec/hr.
Position angle of asteroid motion is 12.5 degrees
The recommended exposure time corresponds to 7.7 km per image.
The 1-sigma error in the time of the event is 9.2 seconds.
The 1-sigma cross-track error in the shadow position is 0.7 km.
The sky-plane scale is 3727.6 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, maximum of 12.4 sec for a central chord
19.6 km assuming a 30% albedo, maximum of 5.1 sec for a central chord
Cross-track diameter of 41.6 km used for deployment plan.
Star training set for 11554_Asios, (2026/10/10 10:03UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.3 +07:24:35 0.4 7.34 104 Bellatrix 05:26:34.1 +06:22:18 1.6 4.55 111 PPM 121138 05:36:41.9 +10:15:20 5.7 1.68 109 PPM 121036 05:32:22.4 +10:10:52 7.1 0.83 110 PPM 121003 05:30:29.1 +10:30:56 9.0 0.32 111 PPM 121005 05:30:34.9 +10:40:37 11.1 0.17 111 11554_Asios 05:30:17.3 +10:49:48 16.2 110 Positions are for equinox of date
Star training set for 11554_Asios, (2026/10/10 10:03UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 7.34 104 Bellatrix 05:25:07.8 +06:20:58 1.6 4.55 111 PPM 121138 05:35:13.2 +10:14:24 5.7 1.68 109 PPM 121036 05:30:53.7 +10:09:46 7.1 0.83 110 PPM 121003 05:29:00.2 +10:29:45 9.0 0.32 111 PPM 121005 05:29:05.9 +10:39:26 11.1 0.17 111 11554_Asios 05:28:48.2 +10:48:37 16.2 111 Positions are for J2000