Occultation event with (2357) Phereclos, event index number 4876
Regions able to see the event: SMexico
Geocentric closest approach at 2026/11/25 09:22:42 UTC
J2000 position of star is 05:10:59.3 +19:48:14
Equinox of date position of star is 05:12:34.6 +19:50:07
Star is 9 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=14.0
Use an exposure time of 1.40 seconds with the standard RECON-QHY system.
SNR of 9.2 per integration for unocculted signal
Expected flux drop is 27% with SNR of 2.5 for the occulted depth (per occulted point)
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 18.4 arcsec/hr.
Position angle of asteroid motion is 83.3 degrees
The recommended exposure time corresponds to 23.4 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 34.5 km.
The sky-plane scale is 3271.4 km/arcsec.
Diameter estimates:
95.9 km assuming a 5% albedo, maximum of 5.7 sec for a central chord
39.2 km assuming a 30% albedo, maximum of 2.3 sec for a central chord
Cross-track diameter of 94.6 km used for deployment plan.
Star training set for 2357_Phereclos, (2026/11/25 09:23UT) Object RA Dec mag sep mel Aldebaran 04:37:28.0 +16:33:40 0.8 8.96 11 Alnath 05:27:59.7 +28:37:39 1.6 9.47 9 104 Tau 05:09:02.5 +18:40:44 5.6 1.43 10 PPM 120643 05:10:25.8 +19:53:33 7.4 0.51 9 PPM 120677 05:12:23.4 +19:42:41 9.6 0.13 9 2357_Phereclos 05:12:34.6 +19:50:07 14.0 9 Positions are for equinox of date
Star training set for 2357_Phereclos, (2026/11/25 09:23UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 8.96 11 Alnath 05:26:17.6 +28:36:22 1.6 9.47 9 104 Tau 05:07:27.9 +18:38:44 5.6 1.43 10 PPM 120643 05:08:50.4 +19:51:35 7.4 0.51 9 PPM 120677 05:10:48.1 +19:40:48 9.6 0.13 9 2357_Phereclos 05:10:59.3 +19:48:14 14.0 9 Positions are for J2000