RECON: TNO occultation with 579246

Event between (579246) 14OX415 and star GA0800:07145199 with event index number of 2558415

Geocentric closest approach at 2026/07/13 12:54:37 UTC

J2000 position of star is 17:50:31.9 -09:39:26
Equinox of date position of star is 17:51:44.7 -09:39:43
Stellar brightness G=13.5, use SENSEUP=32 with the MallinCam and and exposure time of 500 milli-seconds with the QHY174 camera.
Star is 159 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=22.4

TNO is 28.8 AU from the Sun and 27.9 AU from the Earth.
The TNO is moving 21.3 km/sec on the sky relative to the star, or, 3.8 arcsec/hr.
The 1-sigma error in the time of the event is 308 seconds.
The 1-sigma cross-track error in the shadow position is 2309 km.

The TNO has an absolute magnitude Hv=7.8
Diameter=162.2 km assuming a 5% albedo -- 7.6 sec chord
Diameter=66.2 km assuming a 30% albedo -- 3.1 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 579246, (2026/07/13 12:55UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.3 -26:29:19  0.9 25.48 151
35Eta Oph      17:11:54.1 -15:45:21  2.6 11.52 156
PPM 233705     17:54:32.0 -10:54:13  6.1  1.39 160
PPM 233617     17:50:06.8 -10:16:53  8.1  0.77 159
PPM 201093     17:51:19.3 -09:37:19  9.8  0.17 159
579246         17:51:59.5 -09:39:46 13.5       159
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 579246, (2026/07/13 12:55UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 25.48 151
35Eta Oph      17:10:22.7 -15:43:29  2.6 11.52 156
PPM 233705     17:53:03.6 -10:53:59  6.1  1.39 160
PPM 233617     17:48:38.8 -10:16:28  8.1  0.77 159
PPM 201093     17:49:51.7 -09:36:57  9.8  0.17 159
579246         17:50:31.9 -09:39:26 13.5       159
Positions are for J2000

Event circumstances last updated at 2022/01/15 00:27:56 UT

Marc W. Buie, Southwest Research Institute

RECON