Occultation event with (2357) Phereclos, event index number 4788
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/20 22:07:29 UTC
J2000 position of star is 05:13:14.4 +19:52:02
Equinox of date position of star is 05:14:49.8 +19:53:50
Star is 70 degrees from the moon. Moon is 82% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=14.1
Use an exposure time of 1.45 seconds with the standard RECON-QHY system.
SNR of 4.1 per integration for unocculted signal
Expected flux drop is 14% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 15.9 km/sec on the sky relative to the star, or, 17.4 arcsec/hr.
Position angle of asteroid motion is 83.0 degrees
The recommended exposure time corresponds to 23.1 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 33.5 km.
The sky-plane scale is 3287.1 km/arcsec.
Diameter estimates:
95.9 km assuming a 5% albedo, maximum of 6.0 sec for a central chord
39.2 km assuming a 30% albedo, maximum of 2.5 sec for a central chord
Cross-track diameter of 94.6 km used for deployment plan.
Star training set for 2357_Phereclos, (2026/11/20 22:07UT) Object RA Dec mag sep mel Aldebaran 04:37:28.0 +16:33:40 0.8 9.48 61 Alnath 05:27:59.6 +28:37:39 1.6 9.23 73 PPM 120839 05:21:53.5 +19:36:12 6.5 1.69 72 PPM 094204 05:16:47.3 +20:05:04 8.4 0.50 71 PPM 120699 05:13:37.5 +19:58:55 9.0 0.30 70 PPM 120739 05:15:52.8 +19:54:37 10.1 0.25 70 2357_Phereclos 05:14:49.8 +19:53:50 14.1 71 Positions are for equinox of date
Star training set for 2357_Phereclos, (2026/11/20 22:07UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 9.48 61 Alnath 05:26:17.6 +28:36:22 1.6 9.23 73 PPM 120839 05:20:18.3 +19:34:41 6.5 1.69 72 PPM 094204 05:15:11.7 +20:03:21 8.4 0.50 71 PPM 120699 05:12:02.0 +19:57:05 9.0 0.30 70 PPM 120739 05:14:17.3 +19:52:52 10.1 0.25 70 2357_Phereclos 05:13:14.4 +19:52:02 14.1 70 Positions are for J2000