RECON observing guide for 20729_99XS143_20250508003536

Occultation event with (20729) 99XS143, event index number 955
Regions able to see the event: SAmericaS

Geocentric closest approach at 2025/05/08 00:35:36 UTC

J2000 position of star is 09:20:26.7 +05:02:07
Equinox of date position of star is 09:21:46.5 +04:55:36
Star is 37 degrees from the moon. Moon is 82% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 79% with SNR of 7.7 for the occulted depth (per occulted point)

Apparent velocity is 9.5 km/sec on the sky relative to the star, or, 9.1 arcsec/hr.
The recommended exposure time corresponds to 5.7 km per image.
The 1-sigma error in the time of the event is 4.4 seconds.
The 1-sigma cross-track error in the shadow position is 37.5 km.
The sky-plane scale is 3754.6 km/arcsec.

Diameter estimates:
48.3 km assuming a 5% albedo, aximum of 5.1 sec for a central chord
19.7 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 48.3 km used for deployment plan.

Star training set for 20729_99XS143, (2025/05/08 00:36UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.2 +11:50:32  1.3 13.72  27
PPM 155539     09:13:32.3 +03:45:42  6.0  2.36  39
PPM 155692     09:21:11.0 +05:06:27  6.9  0.23  37
PPM 155696     09:21:16.5 +05:01:21  9.7  0.16  37
20729_99XS143  09:21:46.5 +04:55:36 16.2        37
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 20729_99XS143, (2025/05/08 00:36UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 13.72  27
PPM 155539     09:12:12.8 +03:52:01  6.0  2.36  39
PPM 155692     09:19:51.1 +05:12:57  6.9  0.23  37
PPM 155696     09:19:56.6 +05:07:51  9.7  0.16  37
20729_99XS143  09:20:26.7 +05:02:07 16.2        37
Positions are for J2000


Created by recondetail.pro, 2025/03/14 11:02:33 MT