Occultation event with (4867) Polites, event index number 1208
Regions able to see the event: Australia
Geocentric closest approach at 2025/08/05 19:37:31 UTC
J2000 position of star is 02:37:59.3 +41:13:47
Equinox of date position of star is 02:39:37.2 +41:20:21
Star is 136 degrees from the moon. Moon is 87% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 4.3 per integration for unocculted signal
Expected flux drop is 47% with SNR of 2.0 for the occulted depth (per occulted point)
Apparent velocity is 21.0 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
Position angle of asteroid motion is 29.7 degrees
The recommended exposure time corresponds to 13.6 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 1.7 km.
The sky-plane scale is 3818.7 km/arcsec.
Diameter estimates:
62.5 km assuming a 5% albedo, aximum of 3.0 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, (2025/08/05 19:38UT) Object RA Dec mag sep mel Aldebaran 04:37:23.5 +16:33:31 0.8 35.42 156 Algol 03:09:50.7 +41:03:09 2.1 5.69 142 PPM 067541 02:38:57.9 +40:00:21 6.3 1.34 136 PPM 045242 02:37:25.1 +40:48:23 8.1 0.68 136 PPM 045299 02:40:38.2 +41:25:56 9.4 0.21 136 PPM 045282 02:39:37.3 +41:09:11 10.8 0.19 136 4867_Polites 02:39:37.2 +41:20:21 15.6 136 Positions are for equinox of date
Star training set for 4867_Polites, (2025/08/05 19:38UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 35.42 156 Algol 03:08:10.1 +40:57:20 2.1 5.69 142 PPM 067541 02:37:20.9 +39:53:46 6.3 1.34 136 PPM 045242 02:35:47.8 +40:41:45 8.1 0.68 136 PPM 045299 02:39:00.2 +41:19:23 9.4 0.21 136 PPM 045282 02:37:59.6 +41:02:36 10.8 0.19 136 4867_Polites 02:37:59.3 +41:13:47 15.6 136 Positions are for J2000