Occultation event with (4543) Phoinix, event index number 3590
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/04/07 04:08:36 UTC
J2000 position of star is 13:11:20.1 -24:09:23
Equinox of date position of star is 13:12:45.8 -24:17:43
Star is 49 degrees from the moon. Moon is 77% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=14.9
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 18% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 17.6 km/sec on the sky relative to the star, or, 18.9 arcsec/hr.
Position angle of asteroid motion is 104.0 degrees
The recommended exposure time corresponds to 23.8 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 24.1 km.
The sky-plane scale is 3353.7 km/arcsec.
Diameter estimates:
67.3 km assuming a 5% albedo, maximum of 3.8 sec for a central chord
27.5 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 63.8 km used for deployment plan.
Star training set for 4543_Phoinix, (2026/04/07 04:09UT) Object RA Dec mag sep mel Spica 13:26:34.8 -11:17:51 1.0 13.41 50 9Bet Crv 12:35:46.3 -23:32:30 2.6 8.49 57 45Psi Hya 13:10:28.5 -23:15:28 4.9 1.16 49 PPM 261298 13:12:11.7 -24:19:07 8.0 0.13 49 4543_Phoinix 13:12:45.8 -24:17:43 14.9 48 Positions are for equinox of date
Star training set for 4543_Phoinix, (2026/04/07 04:09UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 13.41 50 9Bet Crv 12:34:23.2 -23:23:50 2.6 8.49 57 45Psi Hya 13:09:03.2 -23:07:06 4.9 1.16 49 PPM 261298 13:10:46.0 -24:10:46 8.0 0.13 49 4543_Phoinix 13:11:20.1 -24:09:23 14.9 49 Positions are for J2000