Occultation event with (4867) Polites, event index number 1251
Regions able to see the event: Australia
Geocentric closest approach at 2025/08/24 17:25:53 UTC
J2000 position of star is 02:42:06.4 +43:18:39
Equinox of date position of star is 02:43:46.4 +43:25:08
Star is 114 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 31% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 15.9 km/sec on the sky relative to the star, or, 15.8 arcsec/hr.
Position angle of asteroid motion is 7.7 degrees
The recommended exposure time corresponds to 14.3 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 8.5 km.
The sky-plane scale is 3629.7 km/arcsec.
Diameter estimates:
62.5 km assuming a 5% albedo, aximum of 3.9 sec for a central chord
25.5 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 57.3 km used for deployment plan.
Star training set for 4867_Polites, (2025/08/24 17:26UT) Object RA Dec mag sep mel Aldebaran 04:37:23.7 +16:33:31 0.8 36.07 99 Algol 03:09:50.9 +41:03:09 2.1 5.37 111 PPM 067541 02:38:58.1 +40:00:22 6.3 3.53 117 PPM 045419 02:45:15.9 +43:38:43 6.7 0.35 114 PPM 045354 02:43:21.1 +43:15:08 8.6 0.18 114 4867_Polites 02:43:46.4 +43:25:08 15.5 114 Positions are for equinox of date
Star training set for 4867_Polites, (2025/08/24 17:26UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 36.07 99 Algol 03:08:10.1 +40:57:20 2.1 5.37 111 PPM 067541 02:37:20.9 +39:53:46 6.3 3.53 117 PPM 045419 02:43:35.6 +43:32:15 6.7 0.35 114 PPM 045354 02:41:41.2 +43:08:38 8.6 0.18 114 4867_Polites 02:42:06.4 +43:18:39 15.5 114 Positions are for J2000