Occultation event with (5652) Amphimachus, event index number 3604
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/04/09 07:00:20 UTC
J2000 position of star is 11:45:05.5 -00:49:49
Equinox of date position of star is 11:46:26.3 -00:58:34
Star is 102 degrees from the moon. Moon is 59% illuminated.
Stellar brightness G=13.5, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.17 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 85% with SNR of 8.3 for the occulted depth (per occulted point)
Apparent velocity is 15.5 km/sec on the sky relative to the star, or, 16.7 arcsec/hr.
Position angle of asteroid motion is 114.6 degrees
The recommended exposure time corresponds to 2.6 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 23.0 km.
The sky-plane scale is 3345.4 km/arcsec.
Diameter estimates:
54.7 km assuming a 5% albedo, maximum of 3.5 sec for a central chord
22.3 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 53.9 km used for deployment plan.
Star training set for 5652_Amphimachus, (2026/04/09 07:00UT) Object RA Dec mag sep mel Spica 13:26:34.9 -11:17:51 1.0 26.91 75 Denebola 11:50:23.9 +14:25:30 2.1 15.43 108 91Ups Leo 11:38:17.7 -00:58:09 4.3 2.04 104 PPM 178587 11:46:22.1 -00:39:52 7.6 0.31 102 PPM 178585 11:46:19.1 -00:57:40 9.8 0.03 102 5652_Amphimach 11:46:26.3 -00:58:34 15.4 102 Positions are for equinox of date
Star training set for 5652_Amphimachus, (2026/04/09 07:00UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 26.91 75 Denebola 11:49:02.7 +14:34:16 2.1 15.43 108 91Ups Leo 11:36:56.9 -00:49:25 4.3 2.04 104 PPM 178587 11:45:01.3 -00:31:07 7.6 0.31 102 PPM 178585 11:44:58.4 -00:48:54 9.8 0.03 102 5652_Amphimach 11:45:05.5 -00:49:49 15.4 102 Positions are for J2000