Occultation event with (1583) Antilochus, event index number 801
Regions able to see the event: Europe,Australia
Geocentric closest approach at 2025/03/11 19:49:11 UTC
J2000 position of star is 10:37:52.0 -21:42:26
Equinox of date position of star is 10:39:04.8 -21:50:19
Star is 40 degrees from the moon. Moon is 94% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=13.6
Use an exposure time of 1.55 seconds with the standard RECON-QHY system.
Expected flux drop is 88% with SNR of 4.8 per integration
Apparent velocity is 18.1 km/sec on the sky relative to the star, or, 20.6 arcsec/hr.
The recommended exposure time corresponds to 28.1 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 25.1 km.
The sky-plane scale is 3164.5 km/arcsec.
Diameter estimates:
114.8 km assuming a 5% albedo, aximum of 6.3 sec for a central chord
46.9 km assuming a 30% albedo, maximum of 2.6 sec for a central chord
Cross-track diameter of 114.8 km used for deployment plan.
Star training set for 1583_Antilochus, (2025/03/11 19:49UT) Object RA Dec mag sep mel Regulus 10:09:42.7 +11:50:35 1.3 34.44 7 Alphard 09:28:49.5 -08:46:08 2.0 21.36 26 PPM 257864 10:36:09.8 -23:18:24 6.2 1.62 41 PPM 257860 10:35:54.5 -22:20:03 7.6 0.89 40 PPM 257915 10:38:25.8 -21:48:34 8.8 0.15 40 1583_Antilochu 10:39:04.8 -21:50:19 13.6 40 Positions are for equinox of date
Star training set for 1583_Antilochus, (2025/03/11 19:49UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 34.44 7 Alphard 09:27:35.2 -08:39:30 2.0 21.36 26 PPM 257864 10:34:57.5 -23:10:33 6.2 1.62 41 PPM 257860 10:34:42.0 -22:12:12 7.6 0.89 40 PPM 257915 10:37:13.1 -21:40:41 8.8 0.15 40 1583_Antilochu 10:37:52.0 -21:42:26 13.6 40 Positions are for J2000