Occultation event with (4867) Polites, event index number 3139
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/01/13 00:52:44 UTC
J2000 position of star is 01:48:01.1 +42:02:38
Equinox of date position of star is 01:49:35.5 +42:10:22
Star is 155 degrees from the moon. Moon is 28% illuminated.
Stellar brightness G=9.8, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 61.1 per integration for unocculted signal
Expected flux drop is 99% with SNR of 60.8 for the occulted depth (per occulted point)
Apparent velocity is 11.6 km/sec on the sky relative to the star, or, 11.7 arcsec/hr.
Position angle of asteroid motion is 142.5 degrees
The recommended exposure time corresponds to 1.4 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 27.3 km.
The sky-plane scale is 3553.8 km/arcsec.
Diameter estimates:
62.5 km assuming a 5% albedo, maximum of 5.4 sec for a central chord
25.5 km assuming a 30% albedo, maximum of 2.2 sec for a central chord
Cross-track diameter of 57.3 km used for deployment plan.
Star training set for 4867_Polites, (2026/01/13 00:53UT) Object RA Dec mag sep mel Aldebaran 04:37:25.1 +16:33:34 0.8 43.98 157 57Gam1And 02:05:30.6 +42:27:12 2.3 2.96 157 PPM 044319 01:43:23.0 +42:44:35 5.6 1.28 154 PPM 044524 01:54:20.1 +41:58:08 8.2 0.90 156 PPM 044466 01:50:49.2 +42:07:03 8.8 0.23 155 4867_Polites 01:49:35.5 +42:10:22 15.4 155 Positions are for equinox of date
Star training set for 4867_Polites, (2026/01/13 00:53UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 43.98 157 57Gam1And 02:03:54.1 +42:19:46 2.3 2.96 157 PPM 044319 01:41:49.0 +42:36:44 5.6 1.28 154 PPM 044524 01:52:45.2 +41:50:29 8.2 0.90 156 PPM 044466 01:49:14.7 +41:59:20 8.8 0.23 155 4867_Polites 01:48:01.1 +42:02:38 15.4 155 Positions are for J2000