Occultation event with (76867) 00YM5, event index number 4231
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2026/09/13 06:48:40 UTC
J2000 position of star is 04:33:33.0 +34:15:10
Equinox of date position of star is 04:35:17.8 +34:18:25
Star is 125 degrees from the moon. Moon is 5% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 75% with SNR of 7.2 for the occulted depth (per occulted point)
Apparent velocity is 13.5 km/sec on the sky relative to the star, or, 13.7 arcsec/hr.
Position angle of asteroid motion is 22.5 degrees
The recommended exposure time corresponds to 8.8 km per image.
The 1-sigma error in the time of the event is 2.3 seconds.
The 1-sigma cross-track error in the shadow position is 5.8 km.
The sky-plane scale is 3554.5 km/arcsec.
Diameter estimates:
48.3 km assuming a 5% albedo, maximum of 3.6 sec for a central chord
19.7 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 42.8 km used for deployment plan.
Star training set for 76867_00YM5, (2026/09/13 06:49UT) Object RA Dec mag sep mel Aldebaran 04:37:27.4 +16:33:39 0.8 17.75 127 3Iot Aur 04:58:44.2 +33:12:21 2.7 4.99 121 56 Per 04:26:21.7 +34:01:08 6.2 1.87 127 PPM 069509 04:35:50.0 +34:51:15 8.5 0.56 125 PPM 069497 04:34:51.9 +34:35:43 9.5 0.30 125 PPM 069512 04:36:15.2 +34:20:06 10.1 0.20 125 76867_00YM5 04:35:17.8 +34:18:25 16.0 125 Positions are for equinox of date
Star training set for 76867_00YM5, (2026/09/13 06:49UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 17.75 127 3Iot Aur 04:56:59.6 +33:09:57 2.7 4.99 121 56 Per 04:24:37.6 +33:57:34 6.2 1.87 127 PPM 069509 04:34:04.8 +34:48:01 8.5 0.56 125 PPM 069497 04:33:06.9 +34:32:27 9.5 0.30 125 PPM 069512 04:34:30.4 +34:16:53 10.1 0.20 125 76867_00YM5 04:33:33.0 +34:15:10 16.0 125 Positions are for J2000