RECON: TNO occultation with 523718

Event between (523718) 14KZ101 and star GA0840:07428035 with event index number of 2329975

Geocentric closest approach at 2025/08/19 14:12:06 UTC

J2000 position of star is 18:13:10.5 -05:55:14
Equinox of date position of star is 18:14:29.1 -05:54:45
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 156 degrees from the moon. Moon is 15% illuminated.
Apparent brightness V=22.1

Object is 35.7 AU from the Sun and 35.1 AU from the Earth.
Apparent velocity is 13.6 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 497 seconds.
The 1-sigma cross-track error in the shadow position is 3251 km.

The object has an absolute magnitude Hv=6.5
Diameter=316.2 km assuming a 5% albedo -- 22.2 sec chord
Diameter=129.1 km assuming a 30% albedo -- 9.0 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 523718, (2025/08/19 14:12UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:59.0 -26:29:12  0.9 32.13 149
60Bet Oph      17:44:44.4 +04:33:30  2.8 12.85 144
PPM 201392     18:07:31.2 -08:19:12  6.1  2.97 158
PPM 201493     18:13:17.7 -05:36:58  7.6  0.43 156
PPM 201501     18:13:52.5 -05:50:07  9.5  0.18 156
523718         18:14:32.9 -05:54:43 16.7       157
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, (2025/08/19 14:12UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 32.13 149
60Bet Oph      17:43:28.3 +04:34:06  2.8 12.85 144
PPM 201392     18:06:07.4 -08:19:27  6.1  2.97 158
PPM 201493     18:11:55.5 -05:37:26  7.6  0.43 156
PPM 201501     18:12:30.1 -05:50:37  9.5  0.18 156
523718         18:13:10.5 -05:55:14 16.7       156
Positions are for J2000

Event circumstances last updated at 2024/06/18 02:52:57 UT

Marc W. Buie, Southwest Research Institute

RECON