Occultation event with (3794) Sthenelos, event index number 3853
Regions able to see the event: Australia
Geocentric closest approach at 2026/07/17 09:38:33 UTC
J2000 position of star is 11:53:56.2 -01:59:39
Equinox of date position of star is 11:55:17.8 -02:08:30
Star is 24 degrees from the moon. Moon is 12% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=16.8
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 4.4 per integration for unocculted signal
Expected flux drop is 81% with SNR of 3.6 for the occulted depth (per occulted point)
Apparent velocity is 23.7 km/sec on the sky relative to the star, or, 18.6 arcsec/hr.
Position angle of asteroid motion is 113.5 degrees
The recommended exposure time corresponds to 8.3 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 22.0 km.
The sky-plane scale is 4579.2 km/arcsec.
Diameter estimates:
47.2 km assuming a 5% albedo, maximum of 2.0 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 34.5 km used for deployment plan.
Star training set for 3794_Sthenelos, (2026/07/17 09:39UT) Object RA Dec mag sep mel Spica 13:26:35.7 -11:17:56 1.0 24.42 48 4Gam Crv 12:17:10.5 -17:41:21 2.6 16.45 37 PPM 178683 12:07:21.4 -03:16:46 6.4 3.22 27 PPM 178629 11:56:13.8 -01:36:06 7.9 0.59 24 PPM 178620 11:54:58.9 -02:09:33 9.8 0.08 24 3794_Sthenelos 11:55:17.8 -02:08:30 16.8 24 Positions are for equinox of date
Star training set for 3794_Sthenelos, (2026/07/17 09:39UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 24.42 48 4Gam Crv 12:15:48.1 -17:32:30 2.6 16.45 37 PPM 178683 12:05:59.8 -03:07:54 6.4 3.22 27 PPM 178629 11:54:52.2 -01:27:14 7.9 0.59 24 PPM 178620 11:53:37.3 -02:00:41 9.8 0.08 24 3794_Sthenelos 11:53:56.2 -01:59:39 16.8 24 Positions are for J2000