RECON: TNO occultation with 579246

Event between (579246) 14OX415 and star GA0800:07558606 with event index number of 2558367

Geocentric closest approach at 2026/05/08 01:07:06 UTC

J2000 position of star is 17:57:21.4 -09:38:43
Equinox of date position of star is 17:58:34.1 -09:38:47
Stellar brightness G=14.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 32 degrees from the moon. Moon is 68% illuminated.
TNO apparent brightness V=22.5

TNO is 28.8 AU from the Sun and 28.0 AU from the Earth.
The TNO is moving 15.9 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 429 seconds.
The 1-sigma cross-track error in the shadow position is 3436 km.

The TNO has an absolute magnitude Hv=7.8
Diameter=162.2 km assuming a 5% albedo -- 10.2 sec chord
Diameter=66.2 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 579246, (2026/05/08 01:07UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:01.6 -26:29:17  0.9 26.72  47
35Eta Oph      17:11:53.5 -15:45:20  2.6 12.96  40
64Nu Oph       18:00:28.7 -09:46:28  3.3  0.43  32
PPM 233708     17:54:39.0 -10:22:34  8.1  1.26  33
PPM 201243     17:59:24.9 -09:47:51  9.6  0.21  32
579246         17:58:48.4 -09:38:47 14.4        32
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, (2026/05/08 01:07UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 26.72  47
35Eta Oph      17:10:22.7 -15:43:29  2.6 12.96  40
64Nu Oph       17:59:01.6 -09:46:28  3.3  0.43  32
PPM 233708     17:53:11.5 -10:22:20  8.1  1.26  33
PPM 201243     17:57:57.8 -09:47:48  9.6  0.21  32
579246         17:57:21.4 -09:38:43 14.4        32
Positions are for J2000

Event circumstances last updated at 2022/01/13 00:03:36 UT

Marc W. Buie, Southwest Research Institute

RECON