Occultation event with (34642) 00WN2, event index number 3899
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/07/28 07:20:43 UTC
J2000 position of star is 04:36:17.8 +27:39:14
Equinox of date position of star is 04:37:57.0 +27:42:22
Star is 141 degrees from the moon. Moon is 98% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=16.7
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 69% with SNR of 2.1 for the occulted depth (per occulted point)
Apparent velocity is 29.7 km/sec on the sky relative to the star, or, 25.0 arcsec/hr.
Position angle of asteroid motion is 69.8 degrees
The recommended exposure time corresponds to 13.4 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 23.5 km.
The sky-plane scale is 4270.1 km/arcsec.
Diameter estimates:
41.1 km assuming a 5% albedo, maximum of 1.4 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, (2026/07/28 07:21UT) Object RA Dec mag sep mel Aldebaran 04:37:26.9 +16:33:38 0.8 11.15 138 3Iot Aur 04:58:43.7 +33:12:20 2.7 7.09 145 PPM 093607 04:36:18.0 +29:00:52 5.7 1.36 141 PPM 093637 04:38:48.4 +27:58:39 7.3 0.33 141 PPM 093639 04:39:03.5 +27:48:40 11.4 0.27 141 34642_00WN2 04:37:57.0 +27:42:22 16.7 141 Positions are for equinox of date
Star training set for 34642_00WN2, (2026/07/28 07:21UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.15 138 3Iot Aur 04:56:59.6 +33:09:57 2.7 7.09 145 PPM 093607 04:34:38.0 +28:57:40 5.7 1.36 141 PPM 093637 04:37:09.0 +27:55:32 7.3 0.33 141 PPM 093639 04:37:24.3 +27:45:34 11.4 0.27 141 34642_00WN2 04:36:17.8 +27:39:14 16.7 141 Positions are for J2000