Occultation event with (4543) Phoinix, event index number 816
Regions able to see the event: Australia
Geocentric closest approach at 2025/03/15 17:59:53 UTC
J2000 position of star is 11:29:56.2 -06:48:03
Equinox of date position of star is 11:31:13.2 -06:56:24
Star is 17 degrees from the moon. Moon is 98% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
Expected flux drop is 36% with SNR of 9.4 per integration
Apparent velocity is 18.0 km/sec on the sky relative to the star, or, 20.2 arcsec/hr.
The recommended exposure time corresponds to 5.4 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 26.9 km.
The sky-plane scale is 3203.7 km/arcsec.
Diameter estimates:
66.4 km assuming a 5% albedo, aximum of 3.7 sec for a central chord
27.1 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 66.4 km used for deployment plan.
Star training set for 4543_Phoinix, (2025/03/15 18:00UT) Object RA Dec mag sep mel Regulus 10:09:42.7 +11:50:35 1.3 27.63 42 4Gam Crv 12:17:06.4 -17:40:54 2.6 15.51 13 PPM 194572 11:34:04.5 -07:58:01 5.8 1.25 17 PPM 194544 11:32:08.1 -06:51:30 8.0 0.24 17 PPM 194533 11:31:20.1 -06:58:25 8.9 0.04 17 4543_Phoinix 11:31:13.2 -06:56:24 14.7 17 Positions are for equinox of date
Star training set for 4543_Phoinix, (2025/03/15 18:00UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 27.63 42 4Gam Crv 12:15:48.1 -17:32:30 2.6 15.51 13 PPM 194572 11:32:47.5 -07:49:39 5.8 1.25 17 PPM 194544 11:30:51.1 -06:43:08 8.0 0.24 17 PPM 194533 11:30:03.1 -06:50:04 8.9 0.04 17 4543_Phoinix 11:29:56.2 -06:48:03 14.7 17 Positions are for J2000