Occultation event with (1143) Odysseus, event index number 1025
Regions able to see the event: Europe
Geocentric closest approach at 2025/06/01 19:15:25 UTC
J2000 position of star is 09:04:10.5 +13:47:21
Equinox of date position of star is 09:05:34.4 +13:41:14
Star is 13 degrees from the moon. Moon is 37% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=13.9
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 11% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 26.9 km/sec on the sky relative to the star, or, 25.4 arcsec/hr.
Position angle of asteroid motion is 351.0 degrees
The recommended exposure time corresponds to 30.9 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 15.6 km.
The sky-plane scale is 3805.7 km/arcsec.
Diameter estimates:
125.3 km assuming a 5% albedo, aximum of 4.7 sec for a central chord
51.2 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 125.3 km used for deployment plan.
Star training set for 1143_Odysseus, (2025/06/01 19:15UT) Object RA Dec mag sep mel Regulus 10:09:43.4 +11:50:31 1.3 15.75 4 62Omi1Cnc 08:58:39.8 +15:13:26 5.3 2.27 14 PPM 126082 09:06:21.8 +13:14:28 8.2 0.49 12 PPM 126081 09:06:21.9 +13:39:29 9.0 0.19 12 1143_Odysseus 09:05:34.4 +13:41:14 13.9 12 Positions are for equinox of date
Star training set for 1143_Odysseus, (2025/06/01 19:15UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 15.75 4 62Omi1Cnc 08:57:15.0 +15:19:23 5.3 2.27 14 PPM 126082 09:04:58.1 +13:20:37 8.2 0.49 12 PPM 126081 09:04:58.1 +13:45:38 9.0 0.19 12 1143_Odysseus 09:04:10.5 +13:47:21 13.9 13 Positions are for J2000