Occultation event with (3709) Polypoites, event index number 399
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/01/10 03:06:39 UTC
J2000 position of star is 08:40:12.6 -02:59:38
Equinox of date position of star is 08:41:28.2 -03:05:02
Star is 75 degrees from the moon. Moon is 83% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=14.1
Use an exposure time of 1.45 seconds with the standard RECON-QHY system.
Expected flux drop is 89% with SNR of 3.4 per integration
Apparent velocity is 14.6 km/sec on the sky relative to the star, or, 17.5 arcsec/hr.
The recommended exposure time corresponds to 21.2 km per image.
The 1-sigma error in the time of the event is 3.6 seconds.
The 1-sigma cross-track error in the shadow position is 10.2 km.
The sky-plane scale is 3000.8 km/arcsec.
Diameter estimates:
85.5 km assuming a 5% albedo, aximum of 5.9 sec for a central chord
34.9 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 85.5 km used for deployment plan.
Star training set for 3709_Polypoites, (2025/01/10 03:07UT) Object RA Dec mag sep mel Regulus 10:09:42.1 +11:50:38 1.3 26.53 89 Alphard 09:28:49.0 -08:46:06 2.0 13.07 88 PPM 177501 08:35:17.5 -02:14:19 6.4 1.76 73 PPM 191616 08:43:25.0 -03:08:27 7.6 0.49 75 PPM 191600 08:42:13.7 -03:09:55 9.2 0.21 75 3709_Polypoite 08:41:28.2 -03:05:02 14.1 75 Positions are for equinox of date
Star training set for 3709_Polypoites, (2025/01/10 03:07UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 26.53 89 Alphard 09:27:35.2 -08:39:30 2.0 13.07 88 PPM 177501 08:34:01.6 -02:09:06 6.4 1.76 73 PPM 191616 08:42:09.4 -03:03:00 7.6 0.49 75 PPM 191600 08:40:58.1 -03:04:30 9.2 0.21 75 3709_Polypoite 08:40:12.6 -02:59:38 14.1 75 Positions are for J2000