Occultation event with (34642) 00WN2, event index number 3946
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/06 06:33:38 UTC
J2000 position of star is 04:42:22.0 +28:09:55
Equinox of date position of star is 04:44:01.8 +28:12:51
Star is 27 degrees from the moon. Moon is 48% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=16.7
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 4.0 per integration for unocculted signal
Expected flux drop is 80% with SNR of 3.2 for the occulted depth (per occulted point)
Apparent velocity is 26.7 km/sec on the sky relative to the star, or, 22.9 arcsec/hr.
Position angle of asteroid motion is 68.3 degrees
The recommended exposure time corresponds to 8.0 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 22.7 km.
The sky-plane scale is 4189.2 km/arcsec.
Diameter estimates:
41.1 km assuming a 5% albedo, maximum of 1.5 sec for a central chord
16.8 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 33.3 km used for deployment plan.
Star training set for 34642_00WN2, (2026/08/06 06:34UT) Object RA Dec mag sep mel Aldebaran 04:37:27.0 +16:33:38 0.8 11.75 26 3Iot Aur 04:58:43.8 +33:12:20 2.7 5.91 31 PPM 093690 04:42:59.9 +28:39:51 5.8 0.50 26 PPM 093744 04:47:30.3 +28:42:26 8.0 0.91 27 PPM 093708 04:43:53.0 +28:38:57 9.9 0.44 27 PPM 093685 04:42:42.2 +27:53:36 11.1 0.43 26 34642_00WN2 04:44:01.8 +28:12:51 16.7 27 Positions are for equinox of date
Star training set for 34642_00WN2, (2026/08/06 06:34UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.75 26 3Iot Aur 04:56:59.6 +33:09:57 2.7 5.91 31 PPM 093690 04:41:19.8 +28:36:53 5.8 0.50 26 PPM 093744 04:45:50.1 +28:39:38 8.0 0.91 27 PPM 093708 04:42:12.9 +28:36:02 9.9 0.44 27 PPM 093685 04:41:02.7 +27:50:38 11.1 0.43 26 34642_00WN2 04:42:22.0 +28:09:55 16.7 27 Positions are for J2000