Occultation event with (1143) Odysseus, event index number 3724
Regions able to see the event: US,SAmericaN
Geocentric closest approach at 2026/05/07 04:13:07 UTC
J2000 position of star is 11:04:47.2 +03:10:30
Equinox of date position of star is 11:06:08.7 +03:01:57
Star is 120 degrees from the moon. Moon is 75% illuminated.
Stellar brightness G=11.7, apparent brightess of occulting body is G=13.6
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 24.5 per integration for unocculted signal
Expected flux drop is 86% with SNR of 21.0 for the occulted depth (per occulted point)
Apparent velocity is 2.3 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
Position angle of asteroid motion is 155.1 degrees
The recommended exposure time corresponds to 0.3 km per image.
The 1-sigma error in the time of the event is 19.0 seconds.
The 1-sigma cross-track error in the shadow position is 3.1 km.
The sky-plane scale is 3262.6 km/arcsec.
Diameter estimates:
126.5 km assuming a 5% albedo, maximum of 55.5 sec for a central chord
51.6 km assuming a 30% albedo, maximum of 22.7 sec for a central chord
Cross-track diameter of 114.6 km used for deployment plan.
Star training set for 1143_Odysseus, (2026/05/07 04:13UT) Object RA Dec mag sep mel Regulus 10:09:46.4 +11:50:15 1.3 16.50 136 Denebola 11:50:24.1 +14:25:29 2.1 15.78 115 58 Leo 11:01:55.2 +03:28:32 4.8 1.14 121 PPM 157469 11:05:20.5 +03:29:47 7.3 0.51 120 PPM 157478 11:05:45.6 +03:01:15 9.4 0.10 120 1143_Odysseus 11:06:08.7 +03:01:57 13.6 120 Positions are for equinox of date
This table contains the target star visibility for registered US sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 0.0 % chance of getting at least one chord. There is a 0.0% chance of 2 or more chords assuming clear weather for all.
| Site Name | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time | Xtrack (km) |
Prob |
|---|---|---|---|---|---|---|---|---|---|---|
| NSmith | 04:23:53 | -35.4 | Dark | Down | 41.7 | 237.9 | Up | 04:25:06-04:31:06 | 133.1 | 0.000 |
Star training set for 1143_Odysseus, (2026/05/07 04:13UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 16.50 136 Denebola 11:49:02.7 +14:34:16 2.1 15.78 115 58 Leo 11:00:33.7 +03:37:02 4.8 1.14 121 PPM 157469 11:03:58.9 +03:38:19 7.3 0.51 120 PPM 157478 11:04:24.1 +03:09:47 9.4 0.10 120 1143_Odysseus 11:04:47.2 +03:10:30 13.6 120 Positions are for J2000