Occultation event with (9431) Pytho, event index number 827
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/03/19 02:01:08 UTC
J2000 position of star is 09:21:44.2 -05:33:39
Equinox of date position of star is 09:22:59.7 -05:40:09
Star is 85 degrees from the moon. Moon is 81% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
Expected flux drop is 54% with SNR of 3.5 per integration
Apparent velocity is 15.1 km/sec on the sky relative to the star, or, 16.6 arcsec/hr.
The recommended exposure time corresponds to 10.5 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 34.5 km.
The sky-plane scale is 3264.4 km/arcsec.
Diameter estimates:
44.3 km assuming a 5% albedo, aximum of 2.9 sec for a central chord
18.1 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 44.3 km used for deployment plan.
Star training set for 9431_Pytho, (2025/03/19 02:01UT) Object RA Dec mag sep mel Regulus 10:09:42.7 +11:50:35 1.3 21.01 81 Alphard 09:28:49.6 -08:46:09 2.0 3.42 83 28 Hya 09:26:39.6 -05:13:38 5.6 1.01 84 PPM 192280 09:21:53.4 -05:13:38 8.5 0.52 85 PPM 192283 09:21:59.0 -05:51:46 8.8 0.32 85 9431_Pytho 09:22:59.7 -05:40:09 15.9 85 Positions are for equinox of date
Star training set for 9431_Pytho, (2025/03/19 02:01UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 21.01 81 Alphard 09:27:35.2 -08:39:30 2.0 3.42 83 28 Hya 09:25:24.0 -05:07:03 5.6 1.01 84 PPM 192280 09:20:37.8 -05:07:09 8.5 0.52 85 PPM 192283 09:20:43.7 -05:45:17 8.8 0.32 85 9431_Pytho 09:21:44.2 -05:33:39 15.9 85 Positions are for J2000