Occultation event with (17172) 99NZ41, event index number 3131
Regions able to see the event: Europe
Geocentric closest approach at 2026/01/10 21:04:01 UTC
J2000 position of star is 03:48:37.3 -12:21:48
Equinox of date position of star is 03:49:50.9 -12:17:07
Star is 136 degrees from the moon. Moon is 48% illuminated.
Stellar brightness G=10.2, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 52.5 per integration for unocculted signal
Expected flux drop is 100% with SNR of 52.3 for the occulted depth (per occulted point)
Apparent velocity is 14.4 km/sec on the sky relative to the star, or, 15.6 arcsec/hr.
Position angle of asteroid motion is 155.1 degrees
The recommended exposure time corresponds to 1.7 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 28.3 km.
The sky-plane scale is 3327.4 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, (2026/01/10 21:04UT) Object RA Dec mag sep mel Rigel 05:15:47.4 -08:10:25 0.1 21.53 118 Menkar 03:03:38.6 +04:11:25 2.5 20.08 153 26Pi Eri 03:47:22.4 -12:01:17 4.6 0.66 136 PPM 213468 03:51:48.9 -11:55:06 8.0 0.60 135 PPM 213419 03:49:51.0 -12:17:07 9.9 0.00 136 17172_99NZ41 03:49:50.9 -12:17:07 16.1 135 Positions are for equinox of date
Star training set for 17172_99NZ41, (2026/01/10 21:04UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 21.53 118 Menkar 03:02:16.8 +04:05:21 2.5 20.08 153 26Pi Eri 03:46:08.6 -12:06:04 4.6 0.66 136 PPM 213468 03:50:35.1 -11:59:44 8.0 0.60 135 PPM 213419 03:48:37.3 -12:21:49 9.9 0.00 136 17172_99NZ41 03:48:37.3 -12:21:48 16.1 136 Positions are for J2000