Occultation event with (5144) Achates, event index number 4654
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/12 19:14:53 UTC
J2000 position of star is 05:19:25.1 +32:39:35
Equinox of date position of star is 05:21:10.3 +32:41:07
Star is 170 degrees from the moon. Moon is 11% illuminated.
Stellar brightness G=13.9, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 9.4 per integration for unocculted signal
Expected flux drop is 73% with SNR of 6.8 for the occulted depth (per occulted point)
Apparent velocity is 15.6 km/sec on the sky relative to the star, or, 14.8 arcsec/hr.
Position angle of asteroid motion is 92.1 degrees
The recommended exposure time corresponds to 3.9 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 29.0 km.
The sky-plane scale is 3798.0 km/arcsec.
Diameter estimates:
87.5 km assuming a 5% albedo, maximum of 5.6 sec for a central chord
35.7 km assuming a 30% albedo, maximum of 2.3 sec for a central chord
Cross-track diameter of 81.0 km used for deployment plan.
Star training set for 5144_Achates, (2026/11/12 19:15UT) Object RA Dec mag sep mel Aldebaran 04:37:27.9 +16:33:40 0.8 18.91 158 Alnath 05:27:59.6 +28:37:39 1.6 4.31 173 14 Aur 05:17:09.5 +32:42:57 5.2 0.84 170 PPM 070208 05:21:46.2 +32:48:39 7.8 0.18 170 5144_Achates 05:21:10.3 +32:41:07 14.9 171 Positions are for equinox of date
Star training set for 5144_Achates, (2026/11/12 19:15UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 18.91 158 Alnath 05:26:17.6 +28:36:22 1.6 4.31 173 14 Aur 05:15:24.3 +32:41:15 5.2 0.84 170 PPM 070208 05:20:00.7 +32:47:07 7.8 0.18 170 5144_Achates 05:19:25.1 +32:39:35 14.9 170 Positions are for J2000