Occultation event with (1172) Aneas, event index number 1507
Regions able to see the event: Europe
Geocentric closest approach at 2025/11/13 19:31:39 UTC
J2000 position of star is 03:50:34.9 +23:14:30
Equinox of date position of star is 03:52:07.1 +23:19:06
Star is 100 degrees from the moon. Moon is 34% illuminated.
Stellar brightness G=13.9, apparent brightess of occulting body is G=13.1
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 34% with SNR of 3.2 for the occulted depth (per occulted point)
Apparent velocity is 18.2 km/sec on the sky relative to the star, or, 20.2 arcsec/hr.
Position angle of asteroid motion is 67.2 degrees
The recommended exposure time corresponds to 6.4 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 31.0 km.
The sky-plane scale is 3248.7 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, (2025/11/13 19:32UT) Object RA Dec mag sep mel Aldebaran 04:37:24.5 +16:33:33 0.8 12.60 91 44Zet Per 03:55:45.9 +31:57:30 2.8 8.68 97 PPM 092951 03:51:15.9 +23:47:19 6.1 0.51 100 PPM 092979 03:52:35.0 +23:30:17 9.9 0.21 100 PPM 092976 03:52:26.1 +23:13:47 10.6 0.11 100 1172_Aneas 03:52:07.1 +23:19:06 13.1 99 Positions are for equinox of date
Star training set for 1172_Aneas, (2025/11/13 19:32UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 12.60 91 44Zet Per 03:54:07.9 +31:53:01 2.8 8.68 97 PPM 092951 03:49:43.6 +23:42:42 6.1 0.51 100 PPM 092979 03:51:02.7 +23:25:41 9.9 0.21 100 PPM 092976 03:50:54.0 +23:09:12 10.6 0.11 100 1172_Aneas 03:50:34.9 +23:14:30 13.1 100 Positions are for J2000