Occultation event with (5244) Amphilochos, event index number 1018
Regions able to see the event: Australia
Geocentric closest approach at 2025/05/30 09:49:27 UTC
J2000 position of star is 09:48:11.3 +07:58:31
Equinox of date position of star is 09:49:32.0 +07:51:23
Star is 34 degrees from the moon. Moon is 15% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 4.0 per integration for unocculted signal
Expected flux drop is 63% with SNR of 2.5 for the occulted depth (per occulted point)
Apparent velocity is 18.8 km/sec on the sky relative to the star, or, 17.1 arcsec/hr.
Position angle of asteroid motion is 347.5 degrees
The recommended exposure time corresponds to 11.3 km per image.
The 1-sigma error in the time of the event is 2.8 seconds.
The 1-sigma cross-track error in the shadow position is 19.5 km.
The sky-plane scale is 3954.3 km/arcsec.
Diameter estimates:
45.9 km assuming a 5% albedo, aximum of 2.4 sec for a central chord
18.8 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 45.9 km used for deployment plan.
Star training set for 5244_Amphilochos, (2025/05/30 09:49UT) Object RA Dec mag sep mel Regulus 10:09:43.4 +11:50:31 1.3 6.37 36 PPM 156172 09:47:30.4 +06:35:25 5.8 1.36 34 PPM 156215 09:50:13.7 +08:10:57 7.6 0.37 34 5244_Amphiloch 09:49:32.0 +07:51:23 16.4 34 Positions are for equinox of date
Star training set for 5244_Amphilochos, (2025/05/30 09:49UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 6.37 36 PPM 156172 09:46:10.1 +06:42:30 5.8 1.36 34 PPM 156215 09:48:52.9 +08:18:06 7.6 0.37 34 5244_Amphiloch 09:48:11.3 +07:58:31 16.4 34 Positions are for J2000