Occultation event with (4867) Polites, event index number 1205
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/08/04 07:55:13 UTC
J2000 position of star is 02:37:27.5 +41:03:32
Equinox of date position of star is 02:39:05.2 +41:10:07
Star is 151 degrees from the moon. Moon is 76% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 74% with SNR of 7.3 for the occulted depth (per occulted point)
Apparent velocity is 21.4 km/sec on the sky relative to the star, or, 20.1 arcsec/hr.
Position angle of asteroid motion is 31.0 degrees
The recommended exposure time corresponds to 10.7 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 2.3 km.
The sky-plane scale is 3833.7 km/arcsec.
Diameter estimates:
62.5 km assuming a 5% albedo, aximum of 2.9 sec for a central chord
25.5 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 57.3 km used for deployment plan.
Star training set for 4867_Polites, (2025/08/04 07:55UT) Object RA Dec mag sep mel Aldebaran 04:37:23.5 +16:33:31 0.8 35.40 169 Algol 03:09:50.7 +41:03:09 2.1 5.79 156 PPM 067541 02:38:57.9 +40:00:21 6.3 1.16 151 PPM 045242 02:37:25.1 +40:48:23 8.1 0.48 151 PPM 045256 02:38:13.7 +41:13:00 9.2 0.17 151 PPM 045282 02:39:37.3 +41:09:11 10.8 0.10 151 4867_Polites 02:39:05.2 +41:10:07 15.6 151 Positions are for equinox of date
Star training set for 4867_Polites, (2025/08/04 07:55UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 35.40 169 Algol 03:08:10.1 +40:57:20 2.1 5.79 156 PPM 067541 02:37:20.9 +39:53:46 6.3 1.16 151 PPM 045242 02:35:47.8 +40:41:45 8.1 0.48 151 PPM 045256 02:36:36.1 +41:06:24 9.2 0.17 151 PPM 045282 02:37:59.6 +41:02:36 10.8 0.10 151 4867_Polites 02:37:27.5 +41:03:32 15.6 151 Positions are for J2000