Occultation event with (17172) 99NZ41, event index number 4853
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2026/11/24 07:47:15 UTC
J2000 position of star is 06:27:57.4 -01:54:57
Equinox of date position of star is 06:29:18.9 -01:56:04
Star is 49 degrees from the moon. Moon is 100% 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 54% with SNR of 2.1 for the occulted depth (per occulted point)
Apparent velocity is 13.0 km/sec on the sky relative to the star, or, 14.4 arcsec/hr.
Position angle of asteroid motion is 83.0 degrees
The recommended exposure time corresponds to 8.4 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 39.3 km.
The sky-plane scale is 3243.0 km/arcsec.
Diameter estimates:
40.9 km assuming a 5% albedo, maximum of 3.2 sec for a central chord
16.7 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 34.5 km used for deployment plan.
Star training set for 17172_99NZ41, (2026/11/24 07:47UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.7 +07:24:35 0.4 12.40 37 Saiph 05:49:02.0 -09:39:44 2.1 12.65 47 PPM 176266 06:28:01.3 -01:31:31 5.9 0.52 49 PPM 176283 06:29:57.6 -01:36:30 7.8 0.36 49 PPM 176274 06:28:56.0 -02:13:40 8.9 0.31 49 PPM 176282 06:29:49.8 -01:46:50 10.2 0.20 49 17172_99NZ41 06:29:18.9 -01:56:04 16.0 49 Positions are for equinox of date
Star training set for 17172_99NZ41, (2026/11/24 07:47UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.40 37 Saiph 05:47:45.4 -09:40:11 2.1 12.65 47 PPM 176266 06:26:39.6 -01:30:27 5.9 0.52 49 PPM 176283 06:28:35.9 -01:35:22 7.8 0.36 49 PPM 176274 06:27:34.7 -02:12:34 8.9 0.31 49 PPM 176282 06:28:28.2 -01:45:42 10.2 0.20 49 17172_99NZ41 06:27:57.4 -01:54:57 16.0 49 Positions are for J2000