Occultation event with (22180) 00YZ, event index number 3880
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/07/23 08:49:36 UTC
J2000 position of star is 04:20:00.9 +26:20:02
Equinox of date position of star is 04:21:38.5 +26:23:46
Star is 164 degrees from the moon. Moon is 68% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 46% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 30.1 km/sec on the sky relative to the star, or, 27.8 arcsec/hr.
Position angle of asteroid motion is 89.8 degrees
The recommended exposure time corresponds to 15.0 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 26.8 km.
The sky-plane scale is 3894.7 km/arcsec.
Diameter estimates:
53.5 km assuming a 5% albedo, maximum of 1.8 sec for a central chord
21.8 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 22180_00YZ, (2026/07/23 08:50UT) Object RA Dec mag sep mel Aldebaran 04:37:26.9 +16:33:38 0.8 10.50 159 44Zet Per 03:55:48.5 +31:57:37 2.8 7.92 167 44 Tau 04:12:27.2 +26:32:53 5.4 2.06 166 PPM 093432 04:22:07.7 +25:53:21 8.0 0.52 164 PPM 093418 04:21:01.9 +26:18:05 8.7 0.17 164 22180_00YZ 04:21:38.5 +26:23:46 15.8 164 Positions are for equinox of date
Star training set for 22180_00YZ, (2026/07/23 08:50UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 10.50 159 44Zet Per 03:54:07.9 +31:53:01 2.8 7.92 167 44 Tau 04:10:49.8 +26:28:50 5.4 2.06 166 PPM 093432 04:20:30.4 +25:49:39 8.0 0.52 164 PPM 093418 04:19:24.3 +26:14:21 8.7 0.17 164 22180_00YZ 04:20:00.9 +26:20:02 15.8 164 Positions are for J2000