RECON observing guide for 9431_Pytho_20250526231045

Occultation event with (9431) Pytho, event index number 1004
Regions able to see the event: SAmericaN

Geocentric closest approach at 2025/05/26 23:10:45 UTC

J2000 position of star is 09:29:45.3 -01:16:10
Equinox of date position of star is 09:31:03.0 -01:22:54
Star is 83 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=16.5
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 52% with SNR of 1.6 for the occulted depth (per occulted point)

Apparent velocity is 20.0 km/sec on the sky relative to the star, or, 18.3 arcsec/hr.
The recommended exposure time corresponds to 16.0 km per image.
The 1-sigma error in the time of the event is 2.6 seconds.
The 1-sigma cross-track error in the shadow position is 13.1 km.
The sky-plane scale is 3942.3 km/arcsec.

Diameter estimates:
44.7 km assuming a 5% albedo, aximum of 2.2 sec for a central chord
18.2 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 44.7 km used for deployment plan.

Star training set for 9431_Pytho, (2025/05/26 23:11UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.3 +11:50:31  1.3 16.34  86
Alphard        09:28:50.1 -08:46:12  2.0  7.41  86
32Tau2Hya      09:33:16.5 -01:17:54  4.2  0.56  84
PPM 177878     09:30:19.8 -01:22:10  6.8  0.18  83
PPM 177888     09:31:23.4 -01:30:20  9.9  0.15  83
9431_Pytho     09:31:03.0 -01:22:54 16.5        83
Positions are for equinox of date

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Star training set for 9431_Pytho, (2025/05/26 23:11UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 16.34  86
Alphard        09:27:35.2 -08:39:30  2.0  7.41  86
32Tau2Hya      09:31:58.9 -01:11:06  4.2  0.56  84
PPM 177878     09:29:02.1 -01:15:26  6.8  0.18  83
PPM 177888     09:30:05.8 -01:23:35  9.9  0.15  83
9431_Pytho     09:29:45.3 -01:16:10 16.5        83
Positions are for J2000


Created by recondetail.pro, 2025/03/15 08:51:59 MT