Occultation event with (4543) Phoinix, event index number 3730
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/05/09 06:39:04 UTC
J2000 position of star is 12:55:36.2 -22:43:19
Equinox of date position of star is 12:57:00.8 -22:51:51
Star is 109 degrees from the moon. Moon is 56% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=15.1
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 3.5 per integration for unocculted signal
Expected flux drop is 26% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 14.8 km/sec on the sky relative to the star, or, 15.6 arcsec/hr.
Position angle of asteroid motion is 120.2 degrees
The recommended exposure time corresponds to 15.5 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 16.0 km.
The sky-plane scale is 3410.8 km/arcsec.
Diameter estimates:
67.3 km assuming a 5% albedo, maximum of 4.6 sec for a central chord
27.5 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 63.8 km used for deployment plan.
Star training set for 4543_Phoinix, (2026/05/09 06:39UT) Object RA Dec mag sep mel Spica 13:26:35.1 -11:17:53 1.0 13.55 108 9Bet Crv 12:35:46.6 -23:32:32 2.6 4.93 112 PPM 261041 12:58:57.8 -22:53:44 6.0 0.45 108 PPM 260993 12:56:49.4 -22:51:25 8.8 0.04 109 4543_Phoinix 12:57:00.8 -22:51:51 15.1 108 Positions are for equinox of date
Star training set for 4543_Phoinix, (2026/05/09 06:39UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 13.55 108 9Bet Crv 12:34:23.2 -23:23:50 2.6 4.93 112 PPM 261041 12:57:33.0 -22:45:13 6.0 0.45 108 PPM 260993 12:55:24.8 -22:42:53 8.8 0.04 109 4543_Phoinix 12:55:36.2 -22:43:19 15.1 109 Positions are for J2000