Occultation event with (3794) Sthenelos, event index number 3178
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/01/28 09:11:18 UTC
J2000 position of star is 12:18:14.0 -03:48:01
Equinox of date position of star is 12:19:34.4 -03:56:42
Star is 118 degrees from the moon. Moon is 74% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 81% with SNR of 7.9 for the occulted depth (per occulted point)
Apparent velocity is 5.2 km/sec on the sky relative to the star, or, 4.9 arcsec/hr.
Position angle of asteroid motion is 92.5 degrees
The recommended exposure time corresponds to 3.7 km per image.
The 1-sigma error in the time of the event is 3.7 seconds.
The 1-sigma cross-track error in the shadow position is 31.5 km.
The sky-plane scale is 3854.1 km/arcsec.
Diameter estimates:
47.2 km assuming a 5% albedo, maximum of 9.0 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 3.7 sec for a central chord
Cross-track diameter of 34.5 km used for deployment plan.
Star training set for 3794_Sthenelos, (2026/01/28 09:11UT) Object RA Dec mag sep mel Spica 13:26:34.2 -11:17:48 1.0 18.14 136 4Gam Crv 12:17:09.1 -17:41:12 2.6 13.75 124 PPM 195518 12:29:12.0 -04:45:33 6.2 2.53 121 PPM 195364 12:20:33.8 -03:27:53 8.1 0.54 118 PPM 195349 12:19:25.6 -03:58:23 9.4 0.05 118 3794_Sthenelos 12:19:34.4 -03:56:42 16.4 119 Positions are for equinox of date
Star training set for 3794_Sthenelos, (2026/01/28 09:11UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 18.14 136 4Gam Crv 12:15:48.1 -17:32:30 2.6 13.75 124 PPM 195518 12:27:51.4 -04:36:55 6.2 2.53 121 PPM 195364 12:19:13.4 -03:19:13 8.1 0.54 118 PPM 195349 12:18:05.3 -03:49:42 9.4 0.05 118 3794_Sthenelos 12:18:14.0 -03:48:01 16.4 118 Positions are for J2000