Occultation event with (5652) Amphimachus, event index number 3308
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/02/25 10:47:59 UTC
J2000 position of star is 12:04:17.3 -02:51:55
Equinox of date position of star is 12:05:37.8 -03:00:39
Star is 103 degrees from the moon. Moon is 61% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.50 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 24% with SNR of 0.7 for the occulted depth (per occulted point)
Apparent velocity is 14.8 km/sec on the sky relative to the star, or, 15.9 arcsec/hr.
Position angle of asteroid motion is 111.2 degrees
The recommended exposure time corresponds to 22.2 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 24.7 km.
The sky-plane scale is 3358.6 km/arcsec.
Diameter estimates:
54.7 km assuming a 5% albedo, maximum of 3.7 sec for a central chord
22.3 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 53.9 km used for deployment plan.
Star training set for 5652_Amphimachus, (2026/02/25 10:48UT) Object RA Dec mag sep mel Spica 13:26:34.5 -11:17:49 1.0 21.70 125 4Gam Crv 12:17:09.3 -17:41:13 2.6 14.95 112 PPM 178683 12:07:20.2 -03:16:38 6.4 0.50 104 PPM 178671 12:04:52.2 -02:35:33 7.9 0.46 103 PPM 178673 12:05:35.5 -02:58:34 9.8 0.04 103 5652_Amphimach 12:05:37.8 -03:00:39 15.5 104 Positions are for equinox of date
Star training set for 5652_Amphimachus, (2026/02/25 10:48UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 21.70 125 4Gam Crv 12:15:48.1 -17:32:30 2.6 14.95 112 PPM 178683 12:05:59.8 -03:07:54 6.4 0.50 104 PPM 178671 12:03:31.8 -02:26:49 7.9 0.46 103 PPM 178673 12:04:15.0 -02:49:50 9.8 0.04 103 5652_Amphimach 12:04:17.3 -02:51:55 15.5 103 Positions are for J2000