RECON: TNO occultation with 523718

Event between (523718) 14KZ101 and star GA0840:07883842 with event index number of 2329936

Geocentric closest approach at 2025/06/20 14:09:26 UTC

J2000 position of star is 18:17:33.9 -05:38:53
Equinox of date position of star is 18:18:52.4 -05:38:14
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 107 degrees from the moon. Moon is 30% illuminated.
Apparent brightness V=22.0

Object is 35.7 AU from the Sun and 34.7 AU from the Earth.
Apparent velocity is 22.9 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 322 seconds.
The 1-sigma cross-track error in the shadow position is 2093 km.

The object has an absolute magnitude Hv=6.5
Diameter=316.2 km assuming a 5% albedo -- 13.2 sec chord
Diameter=129.1 km assuming a 30% albedo -- 5.4 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 523718, (2025/06/20 14:09UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.4 -26:29:11  0.9 33.12 133
60Bet Oph      17:44:43.9 +04:33:30  2.8 13.30 113
PPM 201730     18:26:04.9 -07:03:38  6.5  2.28 105
PPM 201612     18:20:40.0 -05:28:31  8.5  0.46 106
PPM 201578     18:18:49.1 -05:30:05  8.9  0.14 107
523718         18:18:55.6 -05:38:12 16.3       106
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 523718, (2025/06/20 14:09UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 33.12 133
60Bet Oph      17:43:28.3 +04:34:06  2.8 13.30 113
PPM 201730     18:24:42.3 -07:04:34  6.5  2.28 105
PPM 201612     18:19:18.4 -05:29:15  8.5  0.46 106
PPM 201578     18:17:27.5 -05:30:45  8.9  0.14 107
523718         18:17:33.9 -05:38:53 16.3       107
Positions are for J2000

Event circumstances last updated at 2024/06/13 03:55:54 UT

Marc W. Buie, Southwest Research Institute

RECON