Occultation event with (76867) 00YM5, event index number 3900
Regions able to see the event: SMexico
Geocentric closest approach at 2026/07/28 10:25:36 UTC
J2000 position of star is 04:12:19.4 +30:16:42
Equinox of date position of star is 04:13:59.7 +30:20:41
Star is 134 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 6.3 per integration for unocculted signal
Expected flux drop is 79% with SNR of 5.0 for the occulted depth (per occulted point)
Apparent velocity is 28.6 km/sec on the sky relative to the star, or, 25.4 arcsec/hr.
Position angle of asteroid motion is 59.8 degrees
The recommended exposure time corresponds to 10.0 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 13.2 km.
The sky-plane scale is 4048.8 km/arcsec.
Diameter estimates:
48.3 km assuming a 5% albedo, maximum of 1.7 sec for a central chord
19.7 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 42.8 km used for deployment plan.
Star training set for 76867_00YM5, (2026/07/28 10:26UT) Object RA Dec mag sep mel Aldebaran 04:37:26.9 +16:33:38 0.8 14.79 137 44Zet Per 03:55:48.6 +31:57:37 2.8 4.21 131 PPM 069071 04:06:24.7 +32:38:31 6.5 2.81 133 PPM 093364 04:16:50.7 +29:57:56 8.2 0.72 135 PPM 093315 04:13:18.2 +29:53:47 9.1 0.47 134 76867_00YM5 04:13:59.7 +30:20:41 16.2 135 Positions are for equinox of date
Star training set for 76867_00YM5, (2026/07/28 10:26UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 14.79 137 44Zet Per 03:54:07.9 +31:53:01 2.8 4.21 131 PPM 069071 04:04:43.1 +32:34:16 6.5 2.81 133 PPM 093364 04:15:10.7 +29:54:03 8.2 0.72 135 PPM 093315 04:11:38.3 +29:49:46 9.1 0.47 134 76867_00YM5 04:12:19.4 +30:16:42 16.2 134 Positions are for J2000