Occultation event with (17172) 99NZ41, event index number 4946
Regions able to see the event: Australia
Geocentric closest approach at 2026/11/29 18:15:36 UTC
J2000 position of star is 06:25:44.4 -01:57:28
Equinox of date position of star is 06:27:06.0 -01:58:30
Star is 47 degrees from the moon. Moon is 66% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 44% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 14.5 km/sec on the sky relative to the star, or, 16.2 arcsec/hr.
Position angle of asteroid motion is 88.0 degrees
The recommended exposure time corresponds to 10.9 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 40.9 km.
The sky-plane scale is 3213.4 km/arcsec.
Diameter estimates:
40.9 km assuming a 5% albedo, maximum of 2.8 sec for a central chord
16.7 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 34.5 km used for deployment plan.
Star training set for 17172_99NZ41, (2026/11/29 18:16UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.8 +07:24:35 0.4 12.08 52 Saiph 05:49:02.0 -09:39:44 2.1 12.19 59 PPM 176266 06:28:01.4 -01:31:31 5.9 0.51 47 PPM 176257 06:27:20.6 -01:49:52 8.5 0.16 47 17172_99NZ41 06:27:06.0 -01:58:30 16.0 47 Positions are for equinox of date
Star training set for 17172_99NZ41, (2026/11/29 18:16UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.08 52 Saiph 05:47:45.4 -09:40:11 2.1 12.19 59 PPM 176266 06:26:39.6 -01:30:27 5.9 0.51 47 PPM 176257 06:25:59.0 -01:48:49 8.5 0.16 47 17172_99NZ41 06:25:44.4 -01:57:28 16.0 47 Positions are for J2000