Occultation event with (2456) Palamedes, event index number 1084
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/06/22 00:26:45 UTC
J2000 position of star is 10:09:55.0 +07:53:13
Equinox of date position of star is 10:11:15.5 +07:45:40
Star is 108 degrees from the moon. Moon is 16% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 57% with SNR of 5.7 for the occulted depth (per occulted point)
Apparent velocity is 26.7 km/sec on the sky relative to the star, or, 23.8 arcsec/hr.
Position angle of asteroid motion is 338.2 degrees
The recommended exposure time corresponds to 18.7 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 26.4 km.
The sky-plane scale is 4042.3 km/arcsec.
Diameter estimates:
84.3 km assuming a 5% albedo, aximum of 3.2 sec for a central chord
34.4 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 84.3 km used for deployment plan.
Star training set for 2456_Palamedes, (2025/06/22 00:27UT) Object RA Dec mag sep mel Regulus 10:09:43.6 +11:50:30 1.3 4.10 106 31 Leo 10:09:15.2 +09:52:18 6.0 2.17 107 PPM 156513 10:07:39.1 +07:49:09 8.4 0.90 107 PPM 156587 10:12:14.9 +07:34:05 8.6 0.31 108 2456_Palamedes 10:11:15.5 +07:45:40 15.0 108 Positions are for equinox of date
Star training set for 2456_Palamedes, (2025/06/22 00:27UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 4.10 106 31 Leo 10:07:54.1 +09:59:49 6.0 2.17 107 PPM 156513 10:06:18.6 +07:56:39 8.4 0.90 107 PPM 156587 10:10:54.4 +07:41:40 8.6 0.31 108 2456_Palamedes 10:09:55.0 +07:53:13 15.0 108 Positions are for J2000