Occultation event with (5144) Achates, event index number 4703
Regions able to see the event: Australia
Geocentric closest approach at 2026/11/15 13:29:51 UTC
J2000 position of star is 05:18:05.7 +32:40:02
Equinox of date position of star is 05:19:51.0 +32:41:38
Star is 139 degrees from the moon. Moon is 32% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=14.9
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 6.4 per integration for unocculted signal
Expected flux drop is 34% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 16.3 km/sec on the sky relative to the star, or, 15.5 arcsec/hr.
Position angle of asteroid motion is 90.9 degrees
The recommended exposure time corresponds to 19.6 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 29.1 km.
The sky-plane scale is 3784.9 km/arcsec.
Diameter estimates:
87.5 km assuming a 5% albedo, maximum of 5.4 sec for a central chord
35.7 km assuming a 30% albedo, maximum of 2.2 sec for a central chord
Cross-track diameter of 81.0 km used for deployment plan.
Star training set for 5144_Achates, (2026/11/15 13:30UT) Object RA Dec mag sep mel Aldebaran 04:37:28.0 +16:33:40 0.8 18.76 127 Alnath 05:27:59.6 +28:37:39 1.6 4.43 141 14 Aur 05:17:09.6 +32:42:57 5.2 0.57 138 PPM 070208 05:21:46.2 +32:48:39 7.8 0.42 139 PPM 070116 05:18:12.2 +32:36:26 9.5 0.36 138 5144_Achates 05:19:51.0 +32:41:38 14.9 139 Positions are for equinox of date
Star training set for 5144_Achates, (2026/11/15 13:30UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 18.76 127 Alnath 05:26:17.6 +28:36:22 1.6 4.43 141 14 Aur 05:15:24.3 +32:41:15 5.2 0.57 138 PPM 070208 05:20:00.7 +32:47:07 7.8 0.42 139 PPM 070116 05:16:27.1 +32:34:46 9.5 0.36 138 5144_Achates 05:18:05.7 +32:40:02 14.9 139 Positions are for J2000