Occultation event with (11554) Asios, event index number 4134
Regions able to see the event: Senegal
Geocentric closest approach at 2026/08/31 05:51:29 UTC
J2000 position of star is 05:20:16.4 +11:38:58
Equinox of date position of star is 05:21:45.7 +11:40:28
Star is 66 degrees from the moon. Moon is 90% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=16.5
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 6.1 per integration for unocculted signal
Expected flux drop is 77% with SNR of 4.7 for the occulted depth (per occulted point)
Apparent velocity is 18.2 km/sec on the sky relative to the star, or, 15.8 arcsec/hr.
Position angle of asteroid motion is 98.0 degrees
The recommended exposure time corresponds to 10.0 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 34.9 km.
The sky-plane scale is 4167.8 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, maximum of 2.6 sec for a central chord
19.6 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 41.6 km used for deployment plan.
Star training set for 11554_Asios, (2026/08/31 05:51UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.0 +07:24:35 0.4 9.59 75 Bellatrix 05:26:33.8 +06:22:18 1.6 5.43 68 18 Ori 05:17:33.1 +11:22:09 5.6 1.08 65 PPM 120858 05:22:40.8 +11:08:01 7.6 0.59 67 PPM 120844 05:21:54.8 +11:38:05 8.9 0.05 66 11554_Asios 05:21:45.7 +11:40:28 16.5 67 Positions are for equinox of date
Star training set for 11554_Asios, (2026/08/31 05:51UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 9.59 75 Bellatrix 05:25:07.8 +06:20:58 1.6 5.43 68 18 Ori 05:16:04.1 +11:20:29 5.6 1.08 65 PPM 120858 05:21:11.9 +11:06:32 7.6 0.59 67 PPM 120844 05:20:25.5 +11:36:35 8.9 0.05 66 11554_Asios 05:20:16.4 +11:38:58 16.5 66 Positions are for J2000