Occultation event with (4708) Polydoros, event index number 4235
Regions able to see the event: Europe,SAfrica
Geocentric closest approach at 2026/09/14 00:26:56 UTC
J2000 position of star is 03:29:29.9 +25:34:45
Equinox of date position of star is 03:31:05.6 +25:40:10
Star is 150 degrees from the moon. Moon is 9% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.2
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 6.8 per integration for unocculted signal
Expected flux drop is 34% with SNR of 2.3 for the occulted depth (per occulted point)
Apparent velocity is 1.9 km/sec on the sky relative to the star, or, 2.1 arcsec/hr.
Position angle of asteroid motion is 8.5 degrees
The recommended exposure time corresponds to 3.8 km per image.
The 1-sigma error in the time of the event is 18.5 seconds.
The 1-sigma cross-track error in the shadow position is 0.7 km.
The sky-plane scale is 3215.9 km/arcsec.
Diameter estimates:
58.6 km assuming a 5% albedo, maximum of 30.8 sec for a central chord
23.9 km assuming a 30% albedo, maximum of 12.6 sec for a central chord
Cross-track diameter of 55.0 km used for deployment plan.
Star training set for 4708_Polydoros, (2026/09/14 00:27UT) Object RA Dec mag sep mel Aldebaran 04:37:27.4 +16:33:39 0.8 17.93 136 44Zet Per 03:55:49.0 +31:57:38 2.8 8.30 143 64 Ari 03:25:53.5 +24:49:00 5.5 1.45 152 PPM 092532 03:29:57.3 +26:21:40 8.5 0.74 150 PPM 092544 03:31:01.2 +25:44:32 9.7 0.07 150 4708_Polydoros 03:31:05.6 +25:40:10 15.2 150 Positions are for equinox of date
Star training set for 4708_Polydoros, (2026/09/14 00:27UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 17.93 136 44Zet Per 03:54:07.9 +31:53:01 2.8 8.30 143 64 Ari 03:24:18.5 +24:43:25 5.5 1.45 152 PPM 092532 03:28:21.2 +26:16:13 8.5 0.74 150 PPM 092544 03:29:25.5 +25:39:07 9.7 0.07 150 4708_Polydoros 03:29:29.9 +25:34:45 15.2 150 Positions are for J2000