Occultation event with (4543) Phoinix, event index number 883
Regions able to see the event: US
Geocentric closest approach at 2025/04/05 00:16:39 UTC
J2000 position of star is 11:19:56.3 -06:02:20
Equinox of date position of star is 11:21:13.3 -06:10:39
Star is 70 degrees from the moon. Moon is 49% illuminated.
Stellar brightness G=13.9, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
Expected flux drop is 29% with SNR of 9.0 per integration
Apparent velocity is 15.7 km/sec on the sky relative to the star, or, 17.4 arcsec/hr.
The recommended exposure time corresponds to 3.9 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 29.2 km.
The sky-plane scale is 3251.5 km/arcsec.
Diameter estimates:
66.4 km assuming a 5% albedo, aximum of 4.2 sec for a central chord
27.1 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 66.4 km used for deployment plan.
Star training set for 4543_Phoinix, (2025/04/05 00:17UT) Object RA Dec mag sep mel Regulus 10:09:42.9 +11:50:34 1.3 25.32 46 4Gam Crv 12:17:06.5 -17:40:55 2.6 17.85 88 PPM 194312 11:18:15.1 -07:16:22 6.1 1.32 70 PPM 194335 11:19:42.0 -06:02:05 8.3 0.40 70 PPM 194344 11:20:38.8 -06:04:40 9.1 0.17 70 4543_Phoinix 11:21:13.3 -06:10:39 14.9 70 Positions are for equinox of date
Star training set for 4543_Phoinix, (2025/04/05 00:17UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 25.32 46 4Gam Crv 12:15:48.1 -17:32:30 2.6 17.85 88 PPM 194312 11:16:58.2 -07:08:05 6.1 1.32 70 PPM 194335 11:18:24.9 -05:53:47 8.3 0.40 70 PPM 194344 11:19:21.7 -05:56:22 9.1 0.17 70 4543_Phoinix 11:19:56.3 -06:02:20 14.9 70 Positions are for J2000