Occultation event with (4543) Phoinix, event index number 1120
Regions able to see the event: Australia
Geocentric closest approach at 2025/07/09 10:13:11 UTC
J2000 position of star is 11:24:58.7 -05:51:16
Equinox of date position of star is 11:26:16.7 -05:59:42
Star is 96 degrees from the moon. Moon is 98% illuminated.
Stellar brightness G=13.8, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
SNR of 8.7 per integration for unocculted signal
Expected flux drop is 85% with SNR of 7.4 for the occulted depth (per occulted point)
Apparent velocity is 23.4 km/sec on the sky relative to the star, or, 20.1 arcsec/hr.
The recommended exposure time corresponds to 4.7 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 36.6 km.
The sky-plane scale is 4189.3 km/arcsec.
Diameter estimates:
66.7 km assuming a 5% albedo, aximum of 2.8 sec for a central chord
27.2 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 66.7 km used for deployment plan.
Star training set for 4543_Phoinix, (2025/07/09 10:13UT) Object RA Dec mag sep mel Regulus 10:09:43.7 +11:50:29 1.3 26.09 121 4Gam Crv 12:17:07.3 -17:41:01 2.6 17.05 79 PPM 194312 11:18:15.8 -07:16:27 6.1 2.37 97 PPM 194426 11:25:39.6 -06:03:04 7.3 0.16 96 PPM 194443 11:26:32.9 -06:00:34 8.9 0.07 95 4543_Phoinix 11:26:16.7 -05:59:42 15.7 95 Positions are for equinox of date
Star training set for 4543_Phoinix, (2025/07/09 10:13UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 26.09 121 4Gam Crv 12:15:48.1 -17:32:30 2.6 17.05 79 PPM 194312 11:16:58.2 -07:08:05 6.1 2.37 97 PPM 194426 11:24:21.6 -05:54:39 7.3 0.16 96 PPM 194443 11:25:14.9 -05:52:08 8.9 0.07 95 4543_Phoinix 11:24:58.7 -05:51:16 15.7 96 Positions are for J2000