Occultation event with (1143) Odysseus, event index number 1190
Regions able to see the event: SMexico
Geocentric closest approach at 2025/04/28 06:01:02 UTC
J2000 position of star is 08:45:50.7 +14:42:05
Equinox of date position of star is 08:47:15.2 +14:36:28
Star is 86 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=13.3, apparent brightess of occulting body is G=13.7
Use an exposure time of 0.16 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 60% with SNR of 5.9 for the occulted depth (per occulted point)
Apparent velocity is 12.4 km/sec on the sky relative to the star, or, 13.1 arcsec/hr.
Position angle of asteroid motion is 358.2 degrees
The recommended exposure time corresponds to 2.0 km per image.
The 1-sigma error in the time of the event is 3.5 seconds.
The 1-sigma cross-track error in the shadow position is 11.8 km.
The sky-plane scale is 3422.3 km/arcsec.
Diameter estimates:
125.3 km assuming a 5% albedo, aximum of 10.1 sec for a central chord
51.2 km assuming a 30% albedo, maximum of 4.1 sec for a central chord
Cross-track diameter of 125.3 km used for deployment plan.
Star training set for 1143_Odysseus, (2025/04/28 06:01UT) Object RA Dec mag sep mel Pollux 07:46:51.7 +27:57:47 1.1 19.36 68 54 Cnc 08:52:25.9 +15:15:18 6.4 1.41 87 PPM 125700 08:46:44.3 +14:57:11 8.1 0.37 85 PPM 125727 08:48:13.7 +14:35:42 9.6 0.24 86 1143_Odysseus 08:47:15.2 +14:36:28 13.7 86 Positions are for equinox of date
Star training set for 1143_Odysseus, (2025/04/28 06:01UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 19.36 68 54 Cnc 08:51:01.3 +15:21:04 6.4 1.41 87 PPM 125700 08:45:19.7 +15:02:48 8.1 0.37 85 PPM 125727 08:46:49.2 +14:41:21 9.6 0.24 86 1143_Odysseus 08:45:50.7 +14:42:05 13.7 86 Positions are for J2000