Occultation event with (18054) 99SW7, event index number 4725
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/11/16 22:22:44 UTC
J2000 position of star is 05:52:32.2 +07:14:26
Equinox of date position of star is 05:53:59.4 +07:14:42
Star is 128 degrees from the moon. Moon is 45% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.9 per integration for unocculted signal
Expected flux drop is 52% with SNR of 2.0 for the occulted depth (per occulted point)
Apparent velocity is 13.0 km/sec on the sky relative to the star, or, 14.3 arcsec/hr.
Position angle of asteroid motion is 84.5 degrees
The recommended exposure time corresponds to 8.5 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 32.3 km.
The sky-plane scale is 3276.2 km/arcsec.
Diameter estimates:
42.9 km assuming a 5% albedo, maximum of 3.3 sec for a central chord
17.5 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 36.2 km used for deployment plan.
Star training set for 18054_99SW7, (2026/11/16 22:23UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.7 +07:24:35 0.4 0.67 128 Bellatrix 05:26:34.4 +06:22:18 1.6 6.86 121 52 Ori 05:49:26.9 +06:27:41 5.5 1.37 126 PPM 149614 05:55:17.7 +06:33:02 8.5 0.77 128 PPM 149572 05:53:44.3 +07:20:02 8.9 0.11 128 18054_99SW7 05:53:59.4 +07:14:42 16.0 128 Positions are for equinox of date
Star training set for 18054_99SW7, (2026/11/16 22:23UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 0.67 128 Bellatrix 05:25:07.8 +06:20:58 1.6 6.86 121 52 Ori 05:48:00.2 +06:27:15 5.5 1.37 126 PPM 149614 05:53:50.9 +06:32:49 8.5 0.77 128 PPM 149572 05:52:17.0 +07:19:45 8.9 0.11 128 18054_99SW7 05:52:32.2 +07:14:26 16.0 128 Positions are for J2000