Occultation event with (1173) Anchises, event index number 3972
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/09 20:24:07 UTC
J2000 position of star is 04:05:23.6 +26:03:45
Equinox of date position of star is 04:07:00.8 +26:07:59
Star is 33 degrees from the moon. Moon is 12% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=14.6
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 17% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 21.1 km/sec on the sky relative to the star, or, 19.6 arcsec/hr.
Position angle of asteroid motion is 75.5 degrees
The recommended exposure time corresponds to 24.3 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 32.5 km.
The sky-plane scale is 3884.6 km/arcsec.
Diameter estimates:
97.7 km assuming a 5% albedo, maximum of 4.6 sec for a central chord
39.9 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 99.5 km used for deployment plan.
Star training set for 1173_Anchises, (2026/08/09 20:24UT) Object RA Dec mag sep mel Aldebaran 04:37:27.0 +16:33:38 0.8 11.90 30 44Zet Per 03:55:48.7 +31:57:37 2.8 6.32 35 44 Tau 04:12:27.4 +26:32:53 5.4 1.29 32 PPM 093246 04:07:41.7 +26:16:54 7.9 0.21 33 PPM 093238 04:07:13.2 +26:09:33 9.6 0.05 33 1173_Anchises 04:07:00.8 +26:07:59 14.6 33 Positions are for equinox of date
Star training set for 1173_Anchises, (2026/08/09 20:24UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.90 30 44Zet Per 03:54:07.9 +31:53:01 2.8 6.32 35 44 Tau 04:10:49.8 +26:28:50 5.4 1.29 32 PPM 093246 04:06:04.5 +26:12:42 7.9 0.21 33 PPM 093238 04:05:36.0 +26:05:19 9.6 0.05 33 1173_Anchises 04:05:23.6 +26:03:45 14.6 33 Positions are for J2000