Occultation event with (4708) Polydoros, event index number 3945
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/06 06:17:13 UTC
J2000 position of star is 03:19:02.2 +24:25:59
Equinox of date position of star is 03:20:36.3 +24:31:42
Star is 8 degrees from the moon. Moon is 48% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 4.1 per integration for unocculted signal
Expected flux drop is 44% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 18.5 km/sec on the sky relative to the star, or, 18.4 arcsec/hr.
Position angle of asteroid motion is 69.3 degrees
The recommended exposure time corresponds to 13.0 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 30.2 km.
The sky-plane scale is 3631.9 km/arcsec.
Diameter estimates:
58.6 km assuming a 5% albedo, maximum of 3.2 sec for a central chord
23.9 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 55.0 km used for deployment plan.
Star training set for 4708_Polydoros, (2026/08/06 06:17UT) Object RA Dec mag sep mel Aldebaran 04:37:27.0 +16:33:38 0.8 19.65 26 44Zet Per 03:55:48.6 +31:57:37 2.8 10.73 18 64 Ari 03:25:53.1 +24:48:59 5.5 1.23 9 PPM 092371 03:19:53.9 +24:10:38 8.1 0.39 8 PPM 092373 03:19:54.6 +24:25:10 9.8 0.19 8 4708_Polydoros 03:20:36.3 +24:31:42 15.5 8 Positions are for equinox of date
Star training set for 4708_Polydoros, (2026/08/06 06:17UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 19.65 26 44Zet Per 03:54:07.9 +31:53:01 2.8 10.73 18 64 Ari 03:24:18.5 +24:43:25 5.5 1.23 9 PPM 092371 03:18:19.9 +24:04:54 8.1 0.39 8 PPM 092373 03:18:20.5 +24:19:26 9.8 0.19 8 4708_Polydoros 03:19:02.2 +24:25:59 15.5 8 Positions are for J2000