RECON: TNO occultation with 523686

Event between (523686) 14DB143 and star GA0880:10053693 with event index number of 2622472

Geocentric closest approach at 2025/06/01 03:37:10 UTC

J2000 position of star is 18:53:38.5 -01:13:13
Equinox of date position of star is 18:54:54.4 -01:11:18
Stellar brightness G=16.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 139 degrees from the moon. Moon is 30% illuminated.
Apparent brightness V=22.3

Object is 20.3 AU from the Sun and 19.5 AU from the Earth.
Apparent velocity is 18.9 km/sec on the sky relative to the star, or, 4.8 arcsec/hr.
The 1-sigma error in the time of the event is 169 seconds.
The 1-sigma cross-track error in the shadow position is 1384 km.

The object has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 4.8 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 523686, (2025/06/01 03:37UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.2 -26:29:10  0.9 42.84 112
Tarazed        19:47:28.1 +10:40:37  2.7 17.64 142
PPM 180493     18:57:41.8 -01:45:55  6.2  0.90 140
PPM 180463     18:52:56.6 -01:00:45  8.0  0.53 139
PPM 180475     18:55:24.3 -01:16:23  8.9  0.14 140
523686         18:54:57.4 -01:11:13 16.2       140
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 523686, (2025/06/01 03:37UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 42.84 112
Tarazed        19:46:15.6 +10:36:48  2.7 17.64 142
PPM 180493     18:56:22.7 -01:48:01  6.2  0.90 140
PPM 180463     18:51:37.9 -01:02:40  8.0  0.53 139
PPM 180475     18:54:05.4 -01:18:23  8.9  0.14 140
523686         18:53:38.5 -01:13:13 16.2       139
Positions are for J2000

Event circumstances last updated at 2024/06/13 03:51:39 UT

Marc W. Buie, Southwest Research Institute

RECON