Occultation event with (4867) Polites, event index number 1216
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/08/09 05:41:28 UTC
J2000 position of star is 02:39:06.2 +41:37:07
Equinox of date position of star is 02:40:44.5 +41:43:41
Star is 96 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 37% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 20.0 km/sec on the sky relative to the star, or, 19.0 arcsec/hr.
Position angle of asteroid motion is 26.6 degrees
The recommended exposure time corresponds to 14.0 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 0.7 km.
The sky-plane scale is 3784.4 km/arcsec.
Diameter estimates:
62.5 km assuming a 5% albedo, aximum of 3.1 sec for a central chord
25.5 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 57.3 km used for deployment plan.
Star training set for 4867_Polites, (2025/08/09 05:41UT) Object RA Dec mag sep mel Aldebaran 04:37:23.6 +16:33:31 0.8 35.47 114 Algol 03:09:50.7 +41:03:09 2.1 5.50 101 PPM 067541 02:38:57.9 +40:00:21 6.3 1.75 95 PPM 045264 02:38:40.2 +42:10:21 7.3 0.59 96 PPM 045320 02:41:54.7 +41:40:41 9.7 0.22 96 4867_Polites 02:40:44.5 +41:43:41 15.6 96 Positions are for equinox of date
Star training set for 4867_Polites, (2025/08/09 05:41UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 35.47 114 Algol 03:08:10.1 +40:57:20 2.1 5.50 101 PPM 067541 02:37:20.9 +39:53:46 6.3 1.75 95 PPM 045264 02:37:01.8 +42:03:45 7.3 0.59 96 PPM 045320 02:40:16.3 +41:34:10 9.7 0.22 96 4867_Polites 02:39:06.2 +41:37:07 15.6 96 Positions are for J2000