Occultation event with (4867) Polites, event index number 4045
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/19 07:40:36 UTC
J2000 position of star is 05:23:21.5 +48:27:08
Equinox of date position of star is 05:25:23.1 +48:28:31
Star is 140 degrees from the moon. Moon is 42% illuminated.
Stellar brightness G=13.6, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.19 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 87% with SNR of 8.5 for the occulted depth (per occulted point)
Apparent velocity is 27.4 km/sec on the sky relative to the star, or, 24.3 arcsec/hr.
Position angle of asteroid motion is 65.8 degrees
The recommended exposure time corresponds to 5.2 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 29.6 km.
The sky-plane scale is 4065.9 km/arcsec.
Diameter estimates:
62.5 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
25.5 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 57.3 km used for deployment plan.
Star training set for 4867_Polites, (2026/08/19 07:41UT) Object RA Dec mag sep mel Aldebaran 04:37:27.1 +16:33:38 0.8 33.39 155 34Bet Aur 06:01:29.0 +44:56:50 1.9 7.12 136 PPM 048270 05:38:16.8 +47:43:48 6.1 2.28 139 PPM 048133 05:29:59.9 +48:24:03 7.8 0.77 140 PPM 048076 05:26:09.8 +48:19:40 9.2 0.20 140 PPM 048059 05:25:03.7 +48:36:57 10.6 0.15 140 4867_Polites 05:25:23.1 +48:28:31 15.7 140 Positions are for equinox of date
Star training set for 4867_Polites, (2026/08/19 07:41UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 33.39 155 34Bet Aur 05:59:31.6 +44:56:51 1.9 7.12 136 PPM 048270 05:36:16.0 +47:42:55 6.1 2.28 139 PPM 048133 05:27:58.3 +48:22:51 7.8 0.77 140 PPM 048076 05:24:08.5 +48:18:19 9.2 0.20 140 PPM 048059 05:23:02.0 +48:35:34 10.6 0.15 140 4867_Polites 05:23:21.5 +48:27:08 15.7 140 Positions are for J2000