Occultation event with (2357) Phereclos, event index number 4489
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/10/26 04:18:09 UTC
J2000 position of star is 05:22:46.7 +20:12:28
Equinox of date position of star is 05:24:22.2 +20:13:53
Star is 49 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=14.4
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 11% with SNR of 0.3 for the occulted depth (per occulted point)
Apparent velocity is 7.8 km/sec on the sky relative to the star, or, 8.2 arcsec/hr.
Position angle of asteroid motion is 77.4 degrees
The recommended exposure time corresponds to 15.6 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 33.2 km.
The sky-plane scale is 3453.1 km/arcsec.
Diameter estimates:
95.9 km assuming a 5% albedo, maximum of 12.3 sec for a central chord
39.2 km assuming a 30% albedo, maximum of 5.0 sec for a central chord
Cross-track diameter of 94.6 km used for deployment plan.
Star training set for 2357_Phereclos, (2026/10/26 04:18UT) Object RA Dec mag sep mel Aldebaran 04:37:27.8 +16:33:40 0.8 11.71 38 Alnath 05:27:59.4 +28:37:39 1.6 8.44 50 PPM 120839 05:21:53.3 +19:36:12 6.5 0.86 48 PPM 120910 05:25:32.4 +20:01:18 8.4 0.35 49 PPM 094329 05:25:30.4 +20:25:15 9.9 0.33 49 2357_Phereclos 05:24:22.2 +20:13:53 14.4 49 Positions are for equinox of date
Star training set for 2357_Phereclos, (2026/10/26 04:18UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.71 38 Alnath 05:26:17.6 +28:36:22 1.6 8.44 50 PPM 120839 05:20:18.3 +19:34:41 6.5 0.86 48 PPM 120910 05:23:57.1 +19:59:56 8.4 0.35 49 PPM 094329 05:23:54.8 +20:23:52 9.9 0.33 49 2357_Phereclos 05:22:46.7 +20:12:28 14.4 49 Positions are for J2000