Occultation event with (4543) Phoinix, event index number 741
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/03/01 08:08:04 UTC
J2000 position of star is 11:37:26.1 -07:12:26
Equinox of date position of star is 11:38:43.1 -07:20:48
Star is 171 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=14.8
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
Expected flux drop is 67% with SNR of 5.6 per integration
Apparent velocity is 17.0 km/sec on the sky relative to the star, or, 19.0 arcsec/hr.
The recommended exposure time corresponds to 16.2 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 26.7 km.
The sky-plane scale is 3225.0 km/arcsec.
Diameter estimates:
66.4 km assuming a 5% albedo, aximum of 3.9 sec for a central chord
27.1 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 66.4 km used for deployment plan.
Star training set for 4543_Phoinix, (2025/03/01 08:08UT) Object RA Dec mag sep mel Spica 13:26:31.3 -11:17:31 1.0 26.87 155 4Gam Crv 12:17:06.2 -17:40:53 2.6 13.94 161 PPM 194572 11:34:04.4 -07:58:00 5.8 1.31 170 PPM 194671 11:40:06.3 -07:44:22 8.4 0.52 171 PPM 194646 11:38:03.6 -07:31:58 9.6 0.25 171 4543_Phoinix 11:38:43.1 -07:20:48 14.8 171 Positions are for equinox of date
Star training set for 4543_Phoinix, (2025/03/01 08:08UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 26.87 155 4Gam Crv 12:15:48.1 -17:32:30 2.6 13.94 161 PPM 194572 11:32:47.5 -07:49:39 5.8 1.31 170 PPM 194671 11:38:49.4 -07:36:00 8.4 0.52 171 PPM 194646 11:36:46.6 -07:23:36 9.6 0.25 171 4543_Phoinix 11:37:26.1 -07:12:26 14.8 171 Positions are for J2000