Occultation event with (76867) 00YM5, event index number 1148
Regions able to see the event: Australia
Geocentric closest approach at 2025/07/18 19:44:06 UTC
J2000 position of star is 02:35:44.8 +09:31:48
Equinox of date position of star is 02:37:07.0 +09:38:25
Star is 10 degrees from the moon. Moon is 41% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.85 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 43% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 18.5 km/sec on the sky relative to the star, or, 17.7 arcsec/hr.
The recommended exposure time corresponds to 15.8 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 32.2 km.
The sky-plane scale is 3767.3 km/arcsec.
Diameter estimates:
48.3 km assuming a 5% albedo, aximum of 2.6 sec for a central chord
19.7 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 48.3 km used for deployment plan.
Star training set for 76867_00YM5, (2025/07/18 19:44UT) Object RA Dec mag sep mel Aldebaran 04:37:23.4 +16:33:31 0.8 30.05 34 Menkar 03:03:37.1 +04:11:18 2.5 8.54 18 PPM 145637 02:30:57.4 +09:40:43 6.5 1.52 9 PPM 145710 02:35:35.1 +09:05:59 7.8 0.66 10 PPM 145759 02:38:47.6 +09:40:16 9.0 0.41 10 PPM 145724 02:36:20.4 +09:57:22 10.2 0.37 9 76867_00YM5 02:37:07.0 +09:38:25 16.1 10 Positions are for equinox of date
Star training set for 76867_00YM5, (2025/07/18 19:44UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 30.05 34 Menkar 03:02:16.8 +04:05:21 2.5 8.54 18 PPM 145637 02:29:35.3 +09:33:57 6.5 1.52 9 PPM 145710 02:34:13.2 +08:59:19 7.8 0.66 10 PPM 145759 02:37:25.4 +09:33:41 9.0 0.41 10 PPM 145724 02:34:58.1 +09:50:44 10.2 0.37 9 76867_00YM5 02:35:44.8 +09:31:48 16.1 10 Positions are for J2000