Occultation event with (9431) Pytho, event index number 898
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/04/12 03:12:38 UTC
J2000 position of star is 09:18:19.7 -03:34:23
Equinox of date position of star is 09:19:36.0 -03:40:50
Star is 52 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=16.1
Use an exposure time of 1.00 seconds with the standard RECON-QHY system.
SNR of 3.4 per integration for unocculted signal
Expected flux drop is 44% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 10.9 km/sec on the sky relative to the star, or, 11.3 arcsec/hr.
The recommended exposure time corresponds to 10.9 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 46.8 km.
The sky-plane scale is 3457.0 km/arcsec.
Diameter estimates:
44.7 km assuming a 5% albedo, aximum of 4.1 sec for a central chord
18.2 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 44.7 km used for deployment plan.
Star training set for 9431_Pytho, (2025/04/12 03:13UT) Object RA Dec mag sep mel Regulus 10:09:42.9 +11:50:34 1.3 19.90 43 Alphard 09:28:49.8 -08:46:10 2.0 5.58 49 28 Hya 09:26:39.8 -05:13:40 5.6 2.34 50 PPM 192233 09:19:11.9 -03:29:42 7.9 0.21 52 PPM 192232 09:19:08.6 -03:39:50 9.2 0.12 52 9431_Pytho 09:19:36.0 -03:40:50 16.1 51 Positions are for equinox of date
Star training set for 9431_Pytho, (2025/04/12 03:13UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 19.90 43 Alphard 09:27:35.2 -08:39:30 2.0 5.58 49 28 Hya 09:25:24.0 -05:07:03 5.6 2.34 50 PPM 192233 09:17:55.4 -03:23:16 7.9 0.21 52 PPM 192232 09:17:52.2 -03:33:24 9.2 0.12 52 9431_Pytho 09:18:19.7 -03:34:23 16.1 52 Positions are for J2000