Occultation event with (5144) Achates, event index number 4888
Regions able to see the event: SMexico
Geocentric closest approach at 2026/11/26 06:13:05 UTC
J2000 position of star is 05:12:25.6 +32:38:30
Equinox of date position of star is 05:14:10.9 +32:40:19
Star is 9 degrees from the moon. Moon is 96% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=14.8
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 4.5 per integration for unocculted signal
Expected flux drop is 26% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 18.5 km/sec on the sky relative to the star, or, 17.8 arcsec/hr.
Position angle of asteroid motion is 86.9 degrees
The recommended exposure time corresponds to 19.4 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 28.5 km.
The sky-plane scale is 3749.1 km/arcsec.
Diameter estimates:
87.5 km assuming a 5% albedo, maximum of 4.7 sec for a central chord
35.7 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 81.0 km used for deployment plan.
Star training set for 5144_Achates, (2026/11/26 06:13UT) Object RA Dec mag sep mel Aldebaran 04:37:28.1 +16:33:40 0.8 18.12 20 3Iot Aur 04:58:45.0 +33:12:22 2.7 3.28 12 14 Aur 05:17:09.7 +32:42:58 5.2 0.63 8 PPM 070028 05:13:55.1 +32:55:32 7.9 0.26 9 5144_Achates 05:14:10.9 +32:40:19 14.8 9 Positions are for equinox of date
Star training set for 5144_Achates, (2026/11/26 06:13UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 18.12 20 3Iot Aur 04:56:59.6 +33:09:57 2.7 3.28 12 14 Aur 05:15:24.3 +32:41:15 5.2 0.63 8 PPM 070028 05:12:09.6 +32:53:42 7.9 0.26 9 5144_Achates 05:12:25.6 +32:38:30 14.8 9 Positions are for J2000