Occultation event with (4867) Polites, event index number 1105
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/06/30 04:48:46 UTC
J2000 position of star is 02:18:09.4 +36:54:04
Equinox of date position of star is 02:19:42.4 +37:01:04
Star is 112 degrees from the moon. Moon is 25% illuminated.
Stellar brightness G=12.7, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 13.6 per integration for unocculted signal
Expected flux drop is 94% with SNR of 12.8 for the occulted depth (per occulted point)
Apparent velocity is 31.9 km/sec on the sky relative to the star, or, 27.6 arcsec/hr.
The recommended exposure time corresponds to 3.8 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 32.3 km.
The sky-plane scale is 4162.0 km/arcsec.
Diameter estimates:
62.5 km assuming a 5% albedo, aximum of 2.0 sec for a central chord
25.5 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 62.5 km used for deployment plan.
Star training set for 4867_Polites, (2025/06/30 04:49UT) Object RA Dec mag sep mel Aldebaran 04:37:23.2 +16:33:30 0.8 36.59 89 57Gam1And 02:05:28.6 +42:27:03 2.3 6.08 111 58 And 02:10:02.2 +37:58:43 4.8 2.15 113 PPM 067132 02:17:27.0 +36:53:16 7.8 0.47 112 PPM 067194 02:20:09.1 +37:11:01 9.2 0.19 112 PPM 067176 02:19:05.1 +37:04:18 10.8 0.14 112 4867_Polites 02:19:42.4 +37:01:04 15.7 112 Positions are for equinox of date
Star training set for 4867_Polites, (2025/06/30 04:49UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 36.59 89 57Gam1And 02:03:54.1 +42:19:46 2.3 6.08 111 58 And 02:08:29.6 +37:51:32 4.8 2.15 113 PPM 067132 02:15:54.3 +36:46:13 7.8 0.47 112 PPM 067194 02:18:36.0 +37:04:02 9.2 0.19 112 PPM 067176 02:17:32.1 +36:57:17 10.8 0.14 112 4867_Polites 02:18:09.4 +36:54:04 15.7 112 Positions are for J2000