Occultation event with (3564) Talthybius, event index number 831
Regions able to see the event: Australia
Geocentric closest approach at 2025/03/20 10:03:22 UTC
J2000 position of star is 08:14:02.2 +37:06:26
Equinox of date position of star is 08:15:40.9 +37:01:45
Star is 129 degrees from the moon. Moon is 70% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=14.9
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
Expected flux drop is 72% with SNR of 6.9 per integration
Apparent velocity is 7.9 km/sec on the sky relative to the star, or, 8.4 arcsec/hr.
The recommended exposure time corresponds to 15.8 km per image.
The 1-sigma error in the time of the event is 2.7 seconds.
The 1-sigma cross-track error in the shadow position is 40.0 km.
The sky-plane scale is 3408.4 km/arcsec.
Diameter estimates:
76.6 km assuming a 5% albedo, aximum of 9.7 sec for a central chord
31.3 km assuming a 30% albedo, maximum of 4.0 sec for a central chord
Cross-track diameter of 76.6 km used for deployment plan.
Star training set for 3564_Talthybius, (2025/03/20 10:03UT) Object RA Dec mag sep mel Pollux 07:46:51.3 +27:57:47 1.1 10.91 134 PPM 073770 08:32:57.7 +37:10:41 6.0 3.45 126 PPM 073474 08:12:10.6 +37:16:20 8.4 0.74 130 PPM 073514 08:15:06.2 +37:06:49 9.7 0.14 129 3564_Talthybiu 08:15:40.9 +37:01:45 14.9 129 Positions are for equinox of date
Star training set for 3564_Talthybius, (2025/03/20 10:03UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 10.91 134 PPM 073770 08:31:20.0 +37:15:52 6.0 3.45 126 PPM 073474 08:10:31.5 +37:20:54 8.4 0.74 130 PPM 073514 08:13:27.4 +37:11:29 9.7 0.14 129 3564_Talthybiu 08:14:02.2 +37:06:26 14.9 129 Positions are for J2000