Occultation event with (1172) Aneas, event index number 1611
Regions able to see the event: Australia
Geocentric closest approach at 2025/11/29 13:08:52 UTC
J2000 position of star is 03:42:02.9 +22:22:42
Equinox of date position of star is 03:43:34.3 +22:27:35
Star is 65 degrees from the moon. Moon is 64% illuminated.
Stellar brightness G=14.2, apparent brightess of occulting body is G=13.1
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 27% with SNR of 2.7 for the occulted depth (per occulted point)
Apparent velocity is 18.3 km/sec on the sky relative to the star, or, 20.2 arcsec/hr.
Position angle of asteroid motion is 65.1 degrees
The recommended exposure time corresponds to 11.0 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 30.2 km.
The sky-plane scale is 3258.1 km/arcsec.
Diameter estimates:
138.7 km assuming a 5% albedo, aximum of 7.6 sec for a central chord
56.6 km assuming a 30% albedo, maximum of 3.1 sec for a central chord
Cross-track diameter of 118.0 km used for deployment plan.
Star training set for 1172_Aneas, (2025/11/29 13:09UT) Object RA Dec mag sep mel Aldebaran 04:37:24.6 +16:33:33 0.8 13.98 77 44Zet Per 03:55:46.1 +31:57:30 2.8 9.88 70 PPM 092798 03:45:59.1 +21:00:30 6.0 1.56 65 PPM 092708 03:41:04.5 +22:55:21 8.0 0.74 65 PPM 092725 03:41:52.6 +22:33:07 9.1 0.40 65 PPM 092730 03:42:02.1 +22:24:53 10.2 0.36 65 1172_Aneas 03:43:34.3 +22:27:35 13.1 66 Positions are for equinox of date
Star training set for 1172_Aneas, (2025/11/29 13:09UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 13.98 77 44Zet Per 03:54:07.9 +31:53:01 2.8 9.88 70 PPM 092798 03:44:28.3 +20:55:42 6.0 1.56 65 PPM 092708 03:39:32.9 +22:50:24 8.0 0.74 65 PPM 092725 03:40:21.1 +22:28:12 9.1 0.40 65 PPM 092730 03:40:30.7 +22:19:57 10.2 0.36 65 1172_Aneas 03:42:02.9 +22:22:42 13.1 65 Positions are for J2000