Occultation event with (11554) Asios, event index number 4438
Regions able to see the event: NZ
Geocentric closest approach at 2026/10/19 13:04:34 UTC
J2000 position of star is 05:28:05.3 +10:35:25
Equinox of date position of star is 05:29:34.3 +10:36:38
Star is 134 degrees from the moon. Moon is 58% illuminated.
Stellar brightness G=12.4, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 16.9 per integration for unocculted signal
Expected flux drop is 97% with SNR of 16.4 for the occulted depth (per occulted point)
Apparent velocity is 6.2 km/sec on the sky relative to the star, or, 6.1 arcsec/hr.
Position angle of asteroid motion is 54.3 degrees
The recommended exposure time corresponds to 0.7 km per image.
The 1-sigma error in the time of the event is 4.2 seconds.
The 1-sigma cross-track error in the shadow position is 23.1 km.
The sky-plane scale is 3638.4 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, maximum of 7.8 sec for a central chord
19.6 km assuming a 30% albedo, maximum of 3.2 sec for a central chord
Cross-track diameter of 41.6 km used for deployment plan.
Star training set for 11554_Asios, (2026/10/19 13:05UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.4 +07:24:35 0.4 7.41 139 Bellatrix 05:26:34.2 +06:22:18 1.6 4.30 132 PPM 121138 05:36:42.0 +10:15:20 5.7 1.79 136 PPM 121036 05:32:22.5 +10:10:53 7.1 0.81 135 PPM 121003 05:30:29.2 +10:30:56 9.0 0.24 134 11554_Asios 05:29:34.3 +10:36:38 16.1 135 Positions are for equinox of date
Star training set for 11554_Asios, (2026/10/19 13:05UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 7.41 139 Bellatrix 05:25:07.8 +06:20:58 1.6 4.30 132 PPM 121138 05:35:13.2 +10:14:24 5.7 1.79 136 PPM 121036 05:30:53.7 +10:09:46 7.1 0.81 135 PPM 121003 05:29:00.2 +10:29:45 9.0 0.24 134 11554_Asios 05:28:05.3 +10:35:25 16.1 134 Positions are for J2000