RECON: TNO occultation with 523715

Event between (523715) 14KU101 and star GA0700:05884543 with event index number of 2331324

Geocentric closest approach at 2025/07/01 12:18:41 UTC

J2000 position of star is 15:39:52.4 -19:06:56
Equinox of date position of star is 15:41:16.9 -19:11:36
Stellar brightness G=16.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 62 degrees from the moon. Moon is 38% illuminated.
Apparent brightness V=22.0

Object is 37.4 AU from the Sun and 36.7 AU from the Earth.
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 110 seconds.
The 1-sigma cross-track error in the shadow position is 1427 km.

The object has an absolute magnitude Hv=6.2
Diameter=332.7 km assuming a 5% albedo -- 20.4 sec chord
Diameter=135.8 km assuming a 30% albedo -- 8.3 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 523715, (2025/07/01 12:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.5 -26:29:11  0.9 13.55  74
7Del Sco       16:01:50.7 -22:41:32  2.3  5.93  67
41 Lib         15:40:22.9 -19:23:02  5.3  0.29  62
PPM 230612     15:43:23.5 -19:32:35  8.2  0.59  62
PPM 230587     15:42:29.7 -19:11:08  9.9  0.27  62
523715         15:41:20.5 -19:11:48 16.2        62
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.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 523715, (2025/07/01 12:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 13.55  74
7Del Sco       16:00:20.0 -22:37:19  2.3  5.93  67
41 Lib         15:38:54.7 -19:18:08  5.3  0.29  62
PPM 230612     15:41:55.2 -19:27:47  8.2  0.59  62
PPM 230587     15:41:01.5 -19:06:18  9.9  0.27  62
523715         15:39:52.4 -19:06:56 16.2        62
Positions are for J2000

Event circumstances last updated at 2024/06/13 03:57:13 UT

Marc W. Buie, Southwest Research Institute

RECON