Occultation event with (4867) Polites, event index number 1240
Regions able to see the event: Australia
Geocentric closest approach at 2025/08/18 20:33:20 UTC
J2000 position of star is 02:41:22.9 +42:41:10
Equinox of date position of star is 02:43:02.3 +42:47:40
Star is 43 degrees from the moon. Moon is 22% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 4.6 per integration for unocculted signal
Expected flux drop is 44% with SNR of 2.0 for the occulted depth (per occulted point)
Apparent velocity is 17.3 km/sec on the sky relative to the star, or, 16.9 arcsec/hr.
Position angle of asteroid motion is 15.9 degrees
The recommended exposure time corresponds to 13.9 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 4.9 km.
The sky-plane scale is 3687.9 km/arcsec.
Diameter estimates:
62.5 km assuming a 5% albedo, aximum of 3.6 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, (2025/08/18 20:33UT) Object RA Dec mag sep mel Aldebaran 04:37:23.7 +16:33:31 0.8 35.78 24 Algol 03:09:50.8 +41:03:09 2.1 5.28 38 PPM 067541 02:38:58.0 +40:00:22 6.3 2.89 44 PPM 045352 02:43:11.2 +42:42:10 8.2 0.10 43 PPM 045345 02:42:56.9 +42:50:02 10.7 0.04 43 4867_Polites 02:43:02.3 +42:47:40 15.6 42 Positions are for equinox of date
Star training set for 4867_Polites, (2025/08/18 20:33UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 35.78 24 Algol 03:08:10.1 +40:57:20 2.1 5.28 38 PPM 067541 02:37:20.9 +39:53:46 6.3 2.89 44 PPM 045352 02:41:31.9 +42:35:40 8.2 0.10 43 PPM 045345 02:41:17.5 +42:43:31 10.7 0.04 43 4867_Polites 02:41:22.9 +42:41:10 15.6 43 Positions are for J2000