Occultation event with (5254) Ulysses, event index number 889
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/04/08 04:05:15 UTC
J2000 position of star is 09:46:19.4 +40:29:09
Equinox of date position of star is 09:47:52.9 +40:22:05
Star is 25 degrees from the moon. Moon is 80% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=14.5
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 38% with SNR of 3.8 for the occulted depth (per occulted point)
Apparent velocity is 8.5 km/sec on the sky relative to the star, or, 9.1 arcsec/hr.
The recommended exposure time corresponds to 10.6 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 39.5 km.
The sky-plane scale is 3352.1 km/arcsec.
Diameter estimates:
86.7 km assuming a 5% albedo, aximum of 10.2 sec for a central chord
35.4 km assuming a 30% albedo, maximum of 4.2 sec for a central chord
Cross-track diameter of 86.7 km used for deployment plan.
Star training set for 5254_Ulysses, (2025/04/08 04:05UT) Object RA Dec mag sep mel Pollux 07:46:51.5 +27:57:47 1.1 27.75 32 Merak 11:03:21.0 +56:14:47 2.4 20.10 43 43 Lyn 09:43:33.7 +39:38:29 5.6 1.10 24 PPM 074746 09:47:38.6 +39:43:14 7.6 0.65 24 PPM 051488 09:49:24.2 +40:08:31 9.7 0.37 24 PPM 051476 09:48:10.3 +40:14:09 10.7 0.14 25 5254_Ulysses 09:47:52.9 +40:22:05 14.5 25 Positions are for equinox of date
Star training set for 5254_Ulysses, (2025/04/08 04:05UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 27.75 32 Merak 11:01:50.7 +56:22:58 2.4 20.10 43 43 Lyn 09:42:00.2 +39:45:27 5.6 1.10 24 PPM 074746 09:46:05.4 +39:50:18 7.6 0.65 24 PPM 051488 09:47:51.0 +40:15:37 9.7 0.37 24 PPM 051476 09:46:37.0 +40:21:13 10.7 0.14 25 5254_Ulysses 09:46:19.4 +40:29:09 14.5 25 Positions are for J2000