Occultation event with (3709) Polypoites, event index number 466
Regions able to see the event: Senegal,Australia
Geocentric closest approach at 2025/01/20 20:52:41 UTC
J2000 position of star is 08:34:58.8 -02:40:15
Equinox of date position of star is 08:36:14.6 -02:45:30
Star is 69 degrees from the moon. Moon is 59% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=14.0
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
Expected flux drop is 67% with SNR of 9.8 per integration
Apparent velocity is 16.4 km/sec on the sky relative to the star, or, 19.9 arcsec/hr.
The recommended exposure time corresponds to 15.6 km per image.
The 1-sigma error in the time of the event is 3.1 seconds.
The 1-sigma cross-track error in the shadow position is 16.1 km.
The sky-plane scale is 2967.8 km/arcsec.
Diameter estimates:
85.5 km assuming a 5% albedo, aximum of 5.2 sec for a central chord
34.9 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 85.5 km used for deployment plan.
Star training set for 3709_Polypoites, (2025/01/20 20:53UT) Object RA Dec mag sep mel Regulus 10:09:42.2 +11:50:38 1.3 27.43 51 Alphard 09:28:49.1 -08:46:06 2.0 14.39 55 PPM 177501 08:35:17.6 -02:14:19 6.4 0.57 70 PPM 177507 08:35:53.3 -02:50:32 8.2 0.12 69 PPM 177510 08:36:26.8 -02:44:39 9.8 0.05 69 3709_Polypoite 08:36:14.6 -02:45:30 14.0 69 Positions are for equinox of date
Star training set for 3709_Polypoites, (2025/01/20 20:53UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 27.43 51 Alphard 09:27:35.2 -08:39:30 2.0 14.39 55 PPM 177501 08:34:01.6 -02:09:06 6.4 0.57 70 PPM 177507 08:34:37.5 -02:45:17 8.2 0.12 69 PPM 177510 08:35:11.0 -02:39:23 9.8 0.05 69 3709_Polypoite 08:34:58.8 -02:40:15 14.0 69 Positions are for J2000