Occultation event with (4867) Polites, event index number 4061
Regions able to see the event: Europe
Geocentric closest approach at 2026/08/21 01:42:04 UTC
J2000 position of star is 05:24:54.2 +48:34:06
Equinox of date position of star is 05:26:56.0 +48:35:25
Star is 155 degrees from the moon. Moon is 59% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 43% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 26.8 km/sec on the sky relative to the star, or, 23.9 arcsec/hr.
Position angle of asteroid motion is 65.2 degrees
The recommended exposure time corresponds to 16.1 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 28.9 km.
The sky-plane scale is 4050.0 km/arcsec.
Diameter estimates:
62.5 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
25.5 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 57.3 km used for deployment plan.
Star training set for 4867_Polites, (2026/08/21 01:42UT) Object RA Dec mag sep mel Aldebaran 04:37:27.1 +16:33:38 0.8 33.59 169 34Bet Aur 06:01:29.0 +44:56:50 1.9 6.94 154 PPM 048270 05:38:16.8 +47:43:48 6.1 2.08 155 PPM 048133 05:29:59.9 +48:24:03 7.8 0.54 155 PPM 048087 05:26:46.9 +48:47:26 9.8 0.20 155 4867_Polites 05:26:56.0 +48:35:25 15.7 155 Positions are for equinox of date
Star training set for 4867_Polites, (2026/08/21 01:42UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 33.59 169 34Bet Aur 05:59:31.6 +44:56:51 1.9 6.94 154 PPM 048270 05:36:16.0 +47:42:55 6.1 2.08 155 PPM 048133 05:27:58.3 +48:22:51 7.8 0.54 155 PPM 048087 05:24:44.8 +48:46:07 9.8 0.20 155 4867_Polites 05:24:54.2 +48:34:06 15.7 155 Positions are for J2000