Occultation event with (1404) Ajax, event index number 698
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/02/23 00:53:02 UTC
J2000 position of star is 09:17:31.9 +21:35:10
Equinox of date position of star is 09:18:57.8 +21:28:46
Star is 136 degrees from the moon. Moon is 28% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=14.3
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
Expected flux drop is 43% with SNR of 9.2 per integration
Apparent velocity is 17.0 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
The recommended exposure time corresponds to 5.1 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 23.6 km.
The sky-plane scale is 3201.3 km/arcsec.
Diameter estimates:
82.4 km assuming a 5% albedo, aximum of 4.8 sec for a central chord
33.7 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 82.4 km used for deployment plan.
Star training set for 1404_Ajax, (2025/02/23 00:53UT) Object RA Dec mag sep mel Regulus 10:09:42.5 +11:50:36 1.3 15.49 121 PPM 099404 09:15:03.2 +21:10:42 6.1 0.96 137 PPM 099465 09:19:15.8 +21:40:30 9.1 0.21 136 1404_Ajax 09:18:57.8 +21:28:46 14.3 136 Positions are for equinox of date
Star training set for 1404_Ajax, (2025/02/23 00:53UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 15.49 121 PPM 099404 09:13:37.2 +21:16:59 6.1 0.96 137 PPM 099465 09:17:49.8 +21:46:54 9.1 0.21 136 1404_Ajax 09:17:31.9 +21:35:10 14.3 136 Positions are for J2000