Occultation event with (4035) Thestor, event index number 3364
Regions able to see the event: Australia
Geocentric closest approach at 2026/03/06 18:29:22 UTC
J2000 position of star is 10:56:21.4 -07:59:25
Equinox of date position of star is 10:57:40.6 -08:07:50
Star is 37 degrees from the moon. Moon is 89% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=14.4
Use an exposure time of 1.00 seconds with the standard RECON-QHY system.
SNR of 7.3 per integration for unocculted signal
Expected flux drop is 31% with SNR of 2.3 for the occulted depth (per occulted point)
Apparent velocity is 17.1 km/sec on the sky relative to the star, or, 19.7 arcsec/hr.
Position angle of asteroid motion is 115.7 degrees
The recommended exposure time corresponds to 17.1 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 29.8 km.
The sky-plane scale is 3126.1 km/arcsec.
Diameter estimates:
74.5 km assuming a 5% albedo, maximum of 4.4 sec for a central chord
30.4 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 68.7 km used for deployment plan.
Star training set for 4035_Thestor, (2026/03/06 18:29UT) Object RA Dec mag sep mel Regulus 10:09:45.8 +11:50:18 1.3 23.25 55 4Gam Crv 12:17:09.4 -17:41:14 2.6 21.57 18 PPM 193828 10:51:02.2 -09:59:31 5.5 2.48 39 PPM 193925 10:56:04.6 -08:31:08 8.2 0.55 38 PPM 193947 10:57:36.6 -08:24:58 9.5 0.29 37 4035_Thestor 10:57:40.6 -08:07:50 14.4 37 Positions are for equinox of date
Star training set for 4035_Thestor, (2026/03/06 18:29UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 23.25 55 4Gam Crv 12:15:48.1 -17:32:30 2.6 21.57 18 PPM 193828 10:49:43.5 -09:51:10 5.5 2.48 39 PPM 193925 10:54:45.6 -08:22:44 8.2 0.55 38 PPM 193947 10:56:17.5 -08:16:33 9.5 0.29 37 4035_Thestor 10:56:21.4 -07:59:25 14.4 37 Positions are for J2000