Occultation event with (5244) Amphilochos, event index number 1021
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/05/31 01:00:52 UTC
J2000 position of star is 09:48:28.6 +07:57:44
Equinox of date position of star is 09:49:49.3 +07:50:35
Star is 26 degrees from the moon. Moon is 20% illuminated.
Stellar brightness G=12.8, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 12.5 per integration for unocculted signal
Expected flux drop is 96% with SNR of 12.1 for the occulted depth (per occulted point)
Apparent velocity is 19.0 km/sec on the sky relative to the star, or, 17.3 arcsec/hr.
Position angle of asteroid motion is 351.6 degrees
The recommended exposure time corresponds to 2.3 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 17.8 km.
The sky-plane scale is 3961.2 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, (2025/05/31 01:01UT) Object RA Dec mag sep mel Regulus 10:09:43.4 +11:50:31 1.3 6.33 27 PPM 156172 09:47:30.4 +06:35:25 5.8 1.38 26 PPM 156215 09:50:13.7 +08:10:57 7.6 0.35 25 5244_Amphiloch 09:49:49.3 +07:50:35 16.4 26 Positions are for equinox of date
Star training set for 5244_Amphilochos, (2025/05/31 01:01UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 6.33 27 PPM 156172 09:46:10.1 +06:42:30 5.8 1.38 26 PPM 156215 09:48:52.9 +08:18:06 7.6 0.35 25 5244_Amphiloch 09:48:28.6 +07:57:44 16.4 26 Positions are for J2000