Occultation event with (4708) Polydoros, event index number 5018
Regions able to see the event: Europe
Geocentric closest approach at 2026/12/03 23:47:08 UTC
J2000 position of star is 02:56:59.9 +23:30:58
Equinox of date position of star is 02:58:33.7 +23:37:23
Star is 146 degrees from the moon. Moon is 23% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=14.8
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 8.8 per integration for unocculted signal
Expected flux drop is 43% with SNR of 3.8 for the occulted depth (per occulted point)
Apparent velocity is 14.3 km/sec on the sky relative to the star, or, 17.6 arcsec/hr.
Position angle of asteroid motion is 63.9 degrees
The recommended exposure time corresponds to 13.5 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 28.2 km.
The sky-plane scale is 2923.1 km/arcsec.
Diameter estimates:
58.6 km assuming a 5% albedo, maximum of 4.1 sec for a central chord
23.9 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 55.0 km used for deployment plan.
Star training set for 4708_Polydoros, (2026/12/03 23:47UT) Object RA Dec mag sep mel Aldebaran 04:37:28.1 +16:33:40 0.8 24.23 124 Hamal 02:08:41.8 +23:35:19 2.0 11.42 157 48Eps Ari 03:00:45.4 +21:26:47 5.6 2.23 146 PPM 092115 03:00:10.1 +24:14:25 8.3 0.72 146 PPM 092057 02:56:01.3 +23:57:19 9.7 0.67 147 PPM 092113 03:00:05.0 +23:33:56 10.9 0.35 146 4708_Polydoros 02:58:33.7 +23:37:23 14.8 146 Positions are for equinox of date
Star training set for 4708_Polydoros, (2026/12/03 23:47UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 24.23 124 Hamal 02:07:10.8 +23:27:41 2.0 11.42 157 48Eps Ari 02:59:12.6 +21:20:25 5.6 2.23 146 PPM 092115 02:58:35.9 +24:08:02 8.3 0.72 146 PPM 092057 02:54:27.5 +23:50:49 9.7 0.67 147 PPM 092113 02:58:31.2 +23:27:33 10.9 0.35 146 4708_Polydoros 02:56:59.9 +23:30:58 14.8 146 Positions are for J2000