Occultation event with (9799) Thronium, event index number 3337
Regions able to see the event: Australia,NZ
Geocentric closest approach at 2026/03/03 10:14:57 UTC
J2000 position of star is 10:21:56.7 -29:44:36
Equinox of date position of star is 10:23:08.9 -29:52:34
Star is 37 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 3.6 per integration for unocculted signal
Expected flux drop is 24% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 17.3 km/sec on the sky relative to the star, or, 18.8 arcsec/hr.
Position angle of asteroid motion is 108.3 degrees
The recommended exposure time corresponds to 16.5 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 25.1 km.
The sky-plane scale is 3326.9 km/arcsec.
Diameter estimates:
71.1 km assuming a 5% albedo, maximum of 4.1 sec for a central chord
29.0 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 68.0 km used for deployment plan.
Star training set for 9799_Thronium, (2026/03/03 10:15UT) Object RA Dec mag sep mel Bet Cru 12:49:16.1 -59:49:53 1.3 38.67 70 Lam Vel 09:08:57.6 -43:32:21 2.2 20.11 56 PPM 257470 10:19:19.8 -29:07:25 5.3 1.12 37 PPM 257579 10:23:34.1 -29:41:18 7.9 0.21 37 9799_Thronium 10:23:08.9 -29:52:34 14.9 37 Positions are for equinox of date
Star training set for 9799_Thronium, (2026/03/03 10:15UT) Object RA Dec mag sep mel Bet Cru 12:47:43.1 -59:41:20 1.3 38.67 70 Lam Vel 09:07:59.7 -43:25:57 2.2 20.11 56 PPM 257470 10:18:07.6 -28:59:31 5.3 1.12 37 PPM 257579 10:22:21.8 -29:33:20 7.9 0.21 37 9799_Thronium 10:21:56.7 -29:44:36 14.9 37 Positions are for J2000