Occultation event with (22180) 00YZ, event index number 1221
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/08/11 08:02:02 UTC
J2000 position of star is 01:57:47.5 +34:43:39
Equinox of date position of star is 01:59:18.0 +34:51:05
Star is 58 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.10 seconds with the standard RECON-QHY system.
SNR of 8.9 per integration for unocculted signal
Expected flux drop is 55% with SNR of 4.9 for the occulted depth (per occulted point)
Apparent velocity is 8.7 km/sec on the sky relative to the star, or, 9.5 arcsec/hr.
Position angle of asteroid motion is 39.1 degrees
The recommended exposure time corresponds to 9.6 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 18.1 km.
The sky-plane scale is 3304.2 km/arcsec.
Diameter estimates:
53.5 km assuming a 5% albedo, aximum of 6.1 sec for a central chord
21.8 km assuming a 30% albedo, maximum of 2.5 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 22180_00YZ, (2025/08/11 08:02UT) Object RA Dec mag sep mel Aldebaran 04:37:23.6 +16:33:31 0.8 39.68 85 57Gam1And 02:05:29.0 +42:27:05 2.3 7.69 64 3Eps Tri 02:04:28.1 +33:24:24 5.5 1.80 58 PPM 066875 02:02:36.4 +35:25:47 8.4 0.89 59 PPM 066850 02:00:51.0 +34:39:18 9.9 0.37 58 PPM 066822 01:59:36.7 +34:51:21 10.3 0.06 58 22180_00YZ 01:59:18.0 +34:51:05 15.5 58 Positions are for equinox of date
Star training set for 22180_00YZ, (2025/08/11 08:02UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 39.68 85 57Gam1And 02:03:54.1 +42:19:46 2.3 7.69 64 3Eps Tri 02:02:57.8 +33:17:04 5.5 1.80 58 PPM 066875 02:01:05.3 +35:18:25 8.4 0.89 59 PPM 066850 01:59:20.4 +34:31:54 9.9 0.37 58 PPM 066822 01:58:06.2 +34:43:55 10.3 0.06 58 22180_00YZ 01:57:47.5 +34:43:39 15.5 58 Positions are for J2000