Occultation event with (3794) Sthenelos, event index number 1045
Regions able to see the event: Australia
Geocentric closest approach at 2025/06/10 09:56:59 UTC
J2000 position of star is 10:19:13.5 +10:31:47
Equinox of date position of star is 10:20:34.3 +10:24:05
Star is 97 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=16.7
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 58% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 19.9 km/sec on the sky relative to the star, or, 16.5 arcsec/hr.
Position angle of asteroid motion is 333.2 degrees
The recommended exposure time corresponds to 15.9 km per image.
The 1-sigma error in the time of the event is 2.7 seconds.
The 1-sigma cross-track error in the shadow position is 37.2 km.
The sky-plane scale is 4337.2 km/arcsec.
Diameter estimates:
46.8 km assuming a 5% albedo, aximum of 2.4 sec for a central chord
19.1 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 46.8 km used for deployment plan.
Star training set for 3794_Sthenelos, (2025/06/10 09:57UT) Object RA Dec mag sep mel Regulus 10:09:43.5 +11:50:31 1.3 3.03 100 45 Leo 10:28:59.5 +09:37:55 5.8 2.21 95 PPM 127336 10:23:13.7 +10:34:14 8.0 0.67 96 PPM 127290 10:19:43.6 +10:42:29 9.1 0.37 97 PPM 127307 10:20:49.2 +10:28:15 10.1 0.09 97 3794_Sthenelos 10:20:34.3 +10:24:05 16.7 96 Positions are for equinox of date
Star training set for 3794_Sthenelos, (2025/06/10 09:57UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 3.03 100 45 Leo 10:27:39.0 +09:45:44 5.8 2.21 95 PPM 127336 10:21:52.8 +10:41:58 8.0 0.67 96 PPM 127290 10:18:22.6 +10:50:10 9.1 0.37 97 PPM 127307 10:19:28.3 +10:35:57 10.1 0.09 97 3794_Sthenelos 10:19:13.5 +10:31:47 16.7 97 Positions are for J2000