Occultation event with (4867) Polites, event index number 1413
Regions able to see the event: Europe
Geocentric closest approach at 2025/10/25 21:11:37 UTC
J2000 position of star is 02:17:05.5 +46:59:08
Equinox of date position of star is 02:18:45.9 +47:06:15
Star is 141 degrees from the moon. Moon is 16% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 5.6 per integration for unocculted signal
Expected flux drop is 39% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 17.1 km/sec on the sky relative to the star, or, 19.3 arcsec/hr.
Position angle of asteroid motion is 87.0 degrees
The recommended exposure time corresponds to 13.7 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 24.0 km.
The sky-plane scale is 3197.3 km/arcsec.
Diameter estimates:
62.5 km assuming a 5% albedo, aximum of 3.7 sec for a central chord
25.5 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 57.3 km used for deployment plan.
Star training set for 4867_Polites, (2025/10/25 21:12UT) Object RA Dec mag sep mel Aldebaran 04:37:24.3 +16:33:33 0.8 41.80 165 57Gam1And 02:05:29.8 +42:27:08 2.3 5.21 139 62 And 02:20:57.6 +47:29:51 5.3 0.54 141 PPM 044913 02:16:26.4 +46:48:24 6.7 0.50 140 PPM 044974 02:20:05.1 +46:56:04 9.3 0.28 141 4867_Polites 02:18:45.9 +47:06:15 15.0 141 Positions are for equinox of date
Star training set for 4867_Polites, (2025/10/25 21:12UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 41.80 165 57Gam1And 02:03:54.1 +42:19:46 2.3 5.21 139 62 And 02:19:16.6 +47:22:48 5.3 0.54 141 PPM 044913 02:14:46.5 +46:41:14 6.7 0.50 140 PPM 044974 02:18:24.7 +46:48:59 9.3 0.28 141 4867_Polites 02:17:05.5 +46:59:08 15.0 141 Positions are for J2000