Occultation event with (17172) 99NZ41, event index number 4622
Regions able to see the event: Australia
Geocentric closest approach at 2026/11/09 16:26:50 UTC
J2000 position of star is 06:32:21.0 -01:36:29
Equinox of date position of star is 06:33:42.6 -01:37:47
Star is 125 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=16.2
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 40% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 8.5 km/sec on the sky relative to the star, or, 9.1 arcsec/hr.
Position angle of asteroid motion is 61.1 degrees
The recommended exposure time corresponds to 9.8 km per image.
The 1-sigma error in the time of the event is 3.9 seconds.
The 1-sigma cross-track error in the shadow position is 28.4 km.
The sky-plane scale is 3345.2 km/arcsec.
Diameter estimates:
40.9 km assuming a 5% albedo, maximum of 4.8 sec for a central chord
16.7 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 34.5 km used for deployment plan.
Star training set for 17172_99NZ41, (2026/11/09 16:27UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.6 +07:24:35 0.4 12.93 138 Saiph 05:49:01.9 -09:39:44 2.1 13.71 130 PPM 176316 06:34:59.7 -01:14:34 5.1 0.50 125 PPM 176283 06:29:57.5 -01:36:30 7.8 0.94 126 PPM 176310 06:34:26.4 -01:43:19 8.8 0.20 125 17172_99NZ41 06:33:42.6 -01:37:47 16.2 125 Positions are for equinox of date
Star training set for 17172_99NZ41, (2026/11/09 16:27UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.93 138 Saiph 05:47:45.4 -09:40:11 2.1 13.71 130 PPM 176316 06:33:37.9 -01:13:13 5.1 0.50 125 PPM 176283 06:28:35.9 -01:35:22 7.8 0.94 126 PPM 176310 06:33:04.9 -01:42:00 8.8 0.20 125 17172_99NZ41 06:32:21.0 -01:36:29 16.2 125 Positions are for J2000