Occultation event with (4708) Polydoros, event index number 4988
Regions able to see the event: US,NMexico,SMexico
Geocentric closest approach at 2026/12/02 05:53:17 UTC
J2000 position of star is 02:57:48.8 +23:36:23
Equinox of date position of star is 02:59:22.6 +23:42:47
Star is 123 degrees from the moon. Moon is 40% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 56% with SNR of 5.6 for the occulted depth (per occulted point)
Apparent velocity is 14.6 km/sec on the sky relative to the star, or, 18.0 arcsec/hr.
Position angle of asteroid motion is 64.6 degrees
The recommended exposure time corresponds to 8.0 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 28.7 km.
The sky-plane scale is 2915.3 km/arcsec.
Diameter estimates:
58.6 km assuming a 5% albedo, maximum of 4.0 sec for a central chord
23.9 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 55.0 km used for deployment plan.
Star training set for 4708_Polydoros, (2026/12/02 05:53UT) Object RA Dec mag sep mel Aldebaran 04:37:28.1 +16:33:40 0.8 24.07 102 Hamal 02:08:41.8 +23:35:18 2.0 11.60 134 48Eps Ari 03:00:45.4 +21:26:47 5.6 2.29 124 PPM 092115 03:00:10.1 +24:14:25 8.3 0.56 123 PPM 092113 03:00:05.0 +23:33:56 10.9 0.22 123 4708_Polydoros 02:59:22.6 +23:42:47 14.7 123 Positions are for equinox of date
This table contains the target star visibility for registered US sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 0.0 % chance of getting at least one chord. There is a 0.0% chance of 2 or more chords assuming clear weather for all.
| Site Name | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time | Xtrack (km) |
Prob |
|---|---|---|---|---|---|---|---|---|---|---|
Star training set for 4708_Polydoros, (2026/12/02 05:53UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 24.07 102 Hamal 02:07:10.8 +23:27:41 2.0 11.60 134 48Eps Ari 02:59:12.6 +21:20:25 5.6 2.29 124 PPM 092115 02:58:35.9 +24:08:02 8.3 0.56 123 PPM 092113 02:58:31.2 +23:27:33 10.9 0.22 123 4708_Polydoros 02:57:48.8 +23:36:23 14.7 123 Positions are for J2000