Occultation event with (18054) 99SW7, event index number 4672
Regions able to see the event: Australia
Geocentric closest approach at 2026/11/13 17:11:50 UTC
J2000 position of star is 05:53:42.9 +07:16:26
Equinox of date position of star is 05:55:10.1 +07:16:39
Star is 157 degrees from the moon. Moon is 17% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=16.0
Use an exposure time of 1.00 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 39% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 12.0 km/sec on the sky relative to the star, or, 13.1 arcsec/hr.
Position angle of asteroid motion is 82.4 degrees
The recommended exposure time corresponds to 12.0 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 31.8 km.
The sky-plane scale is 3296.9 km/arcsec.
Diameter estimates:
42.9 km assuming a 5% albedo, maximum of 3.6 sec for a central chord
17.5 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 36.2 km used for deployment plan.
Star training set for 18054_99SW7, (2026/11/13 17:12UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.6 +07:24:35 0.4 0.39 157 Bellatrix 05:26:34.4 +06:22:18 1.6 7.16 152 PPM 149639 05:56:21.7 +05:51:49 6.4 1.44 156 PPM 149645 05:56:49.6 +06:43:59 8.5 0.68 157 PPM 149572 05:53:44.3 +07:20:02 8.9 0.36 157 PPM 149616 05:55:28.1 +07:11:47 10.6 0.11 157 18054_99SW7 05:55:10.1 +07:16:39 16.0 157 Positions are for equinox of date
Star training set for 18054_99SW7, (2026/11/13 17:12UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 0.39 157 Bellatrix 05:25:07.8 +06:20:58 1.6 7.16 152 PPM 149639 05:54:55.4 +05:51:39 6.4 1.44 156 PPM 149645 05:55:22.7 +06:43:49 8.5 0.68 157 PPM 149572 05:52:17.0 +07:19:45 8.9 0.36 157 PPM 149616 05:54:01.0 +07:11:34 10.6 0.11 157 18054_99SW7 05:53:42.9 +07:16:26 16.0 157 Positions are for J2000