Occultation event with (5144) Achates, event index number 4633
Regions able to see the event: US
Geocentric closest approach at 2026/11/10 13:03:43 UTC
J2000 position of star is 05:20:26.9 +32:39:00
Equinox of date position of star is 05:22:12.2 +32:40:30
Star is 160 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=15.0
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 46% with SNR of 4.6 for the occulted depth (per occulted point)
Apparent velocity is 14.9 km/sec on the sky relative to the star, or, 14.1 arcsec/hr.
Position angle of asteroid motion is 93.1 degrees
The recommended exposure time corresponds to 18.6 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 29.4 km.
The sky-plane scale is 3809.7 km/arcsec.
Diameter estimates:
87.5 km assuming a 5% albedo, maximum of 5.9 sec for a central chord
35.7 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 81.0 km used for deployment plan.
Star training set for 5144_Achates, (2026/11/10 13:04UT) Object RA Dec mag sep mel Aldebaran 04:37:27.9 +16:33:40 0.8 19.02 167 Alnath 05:27:59.5 +28:37:39 1.6 4.23 160 14 Aur 05:17:09.5 +32:42:57 5.2 1.06 161 PPM 070208 05:21:46.1 +32:48:38 7.8 0.16 160 5144_Achates 05:22:12.2 +32:40:30 15.0 160 Positions are for equinox of date
Star training set for 5144_Achates, (2026/11/10 13:04UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 19.02 167 Alnath 05:26:17.6 +28:36:22 1.6 4.23 160 14 Aur 05:15:24.3 +32:41:15 5.2 1.06 161 PPM 070208 05:20:00.7 +32:47:07 7.8 0.16 160 5144_Achates 05:20:26.9 +32:39:00 15.0 160 Positions are for J2000