Occultation event with (4708) Polydoros, event index number 3917
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/01 05:18:16 UTC
J2000 position of star is 03:16:22.3 +24:12:27
Equinox of date position of star is 03:17:56.2 +24:18:15
Star is 74 degrees from the moon. Moon is 93% illuminated.
Stellar brightness G=15.0, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 7.8 per integration for unocculted signal
Expected flux drop is 63% with SNR of 4.9 for the occulted depth (per occulted point)
Apparent velocity is 20.6 km/sec on the sky relative to the star, or, 20.2 arcsec/hr.
Position angle of asteroid motion is 69.9 degrees
The recommended exposure time corresponds to 13.4 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 30.8 km.
The sky-plane scale is 3685.9 km/arcsec.
Diameter estimates:
58.6 km assuming a 5% albedo, maximum of 2.8 sec for a central chord
23.9 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 55.0 km used for deployment plan.
Star training set for 4708_Polydoros, (2026/08/01 05:18UT) Object RA Dec mag sep mel Aldebaran 04:37:26.9 +16:33:38 0.8 20.14 91 44Zet Per 03:55:48.6 +31:57:37 2.8 11.32 84 64 Ari 03:25:53.0 +24:48:59 5.5 1.88 76 PPM 092328 03:17:14.0 +24:38:25 8.0 0.37 74 PPM 092334 03:17:41.3 +24:27:42 8.9 0.17 74 4708_Polydoros 03:17:56.2 +24:18:15 15.6 75 Positions are for equinox of date
Star training set for 4708_Polydoros, (2026/08/01 05:18UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 20.14 91 44Zet Per 03:54:07.9 +31:53:01 2.8 11.32 84 64 Ari 03:24:18.5 +24:43:25 5.5 1.88 76 PPM 092328 03:15:40.0 +24:32:37 8.0 0.37 74 PPM 092334 03:16:07.4 +24:21:55 8.9 0.17 74 4708_Polydoros 03:16:22.3 +24:12:27 15.6 74 Positions are for J2000