Occultation event with (4543) Phoinix, event index number 3539
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/03/29 22:59:14 UTC
J2000 position of star is 13:15:40.7 -24:21:45
Equinox of date position of star is 13:17:06.6 -24:30:02
Star is 56 degrees from the moon. Moon is 90% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 6.1 per integration for unocculted signal
Expected flux drop is 38% with SNR of 2.3 for the occulted depth (per occulted point)
Apparent velocity is 16.8 km/sec on the sky relative to the star, or, 17.9 arcsec/hr.
Position angle of asteroid motion is 99.4 degrees
The recommended exposure time corresponds to 15.9 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 25.8 km.
The sky-plane scale is 3374.1 km/arcsec.
Diameter estimates:
67.3 km assuming a 5% albedo, maximum of 4.0 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, (2026/03/29 22:59UT) Object RA Dec mag sep mel Spica 13:26:34.8 -11:17:51 1.0 13.39 52 9Bet Crv 12:35:46.3 -23:32:29 2.6 9.49 48 46Gam Hya 13:20:21.2 -23:18:33 3.0 1.40 56 PPM 261387 13:15:53.2 -24:25:21 7.1 0.29 56 PPM 261420 13:17:21.7 -24:19:09 9.5 0.19 56 4543_Phoinix 13:17:06.6 -24:30:02 15.0 57 Positions are for equinox of date
Star training set for 4543_Phoinix, (2026/03/29 22:59UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 13.39 52 9Bet Crv 12:34:23.2 -23:23:50 2.6 9.49 48 46Gam Hya 13:18:55.4 -23:10:19 3.0 1.40 56 PPM 261387 13:14:27.4 -24:17:03 7.1 0.29 56 PPM 261420 13:15:55.8 -24:10:53 9.5 0.19 56 4543_Phoinix 13:15:40.7 -24:21:45 15.0 56 Positions are for J2000