Occultation event with (1173) Anchises, event index number 3930
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/03 18:26:21 UTC
J2000 position of star is 04:01:47.8 +25:51:17
Equinox of date position of star is 04:03:24.6 +25:55:38
Star is 51 degrees from the moon. Moon is 75% illuminated.
Stellar brightness G=14.4, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 57% with SNR of 5.5 for the occulted depth (per occulted point)
Apparent velocity is 23.6 km/sec on the sky relative to the star, or, 21.6 arcsec/hr.
Position angle of asteroid motion is 75.7 degrees
The recommended exposure time corresponds to 10.6 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 33.2 km.
The sky-plane scale is 3944.1 km/arcsec.
Diameter estimates:
97.7 km assuming a 5% albedo, maximum of 4.1 sec for a central chord
39.9 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 99.5 km used for deployment plan.
Star training set for 1173_Anchises, (2026/08/03 18:26UT) Object RA Dec mag sep mel Aldebaran 04:37:27.0 +16:33:38 0.8 12.26 58 44Zet Per 03:55:48.6 +31:57:37 2.8 6.26 51 36 Tau 04:05:57.4 +24:10:37 6.1 1.84 52 PPM 093184 04:04:18.7 +25:59:36 8.5 0.21 52 PPM 093183 04:03:54.7 +25:59:29 9.8 0.13 52 PPM 093176 04:03:32.3 +25:59:46 10.4 0.07 51 1173_Anchises 04:03:24.6 +25:55:38 14.7 52 Positions are for equinox of date
Star training set for 1173_Anchises, (2026/08/03 18:26UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 12.26 58 44Zet Per 03:54:07.9 +31:53:01 2.8 6.26 51 36 Tau 04:04:21.7 +24:06:21 6.1 1.84 52 PPM 093184 04:02:41.8 +25:55:17 8.5 0.21 52 PPM 093183 04:02:17.8 +25:55:09 9.8 0.13 52 PPM 093176 04:01:55.4 +25:55:25 10.4 0.07 51 1173_Anchises 04:01:47.8 +25:51:17 14.7 51 Positions are for J2000