RECON: TNO occultation with 469506

Event between (469506) 03FF128 and star GA0660:13327480 with event index number of 1505939

Geocentric closest approach at 2026/07/18 22:44:20 UTC

J2000 position of star is 17:27:50.0 -22:57:22
Equinox of date position of star is 17:29:17.9 -22:58:28
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 86 degrees from the moon. Moon is 25% illuminated.
Apparent brightness V=21.9

Object is 31.0 AU from the Sun and 30.2 AU from the Earth.
Apparent velocity is 18.5 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 302 seconds.
The 1-sigma cross-track error in the shadow position is 1232 km.

The object has an absolute magnitude Hv=6.9
Diameter=254.7 km assuming a 5% albedo -- 13.7 sec chord
Diameter=104.0 km assuming a 30% albedo -- 5.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 469506, (2026/07/18 22:44UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.4 -26:29:19  0.9 13.71  73
35Eta Oph      17:11:54.1 -15:45:21  2.6  8.32  82
44 Oph         17:27:59.6 -24:11:50  4.2  1.27  86
PPM 266859     17:27:37.9 -23:11:36  8.4  0.47  86
PPM 266902     17:29:44.1 -23:15:42  9.4  0.29  86
469506         17:29:26.5 -22:58:35 16.5        86
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 469506, (2026/07/18 22:44UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 13.71  73
35Eta Oph      17:10:22.7 -15:43:29  2.6  8.32  82
44 Oph         17:26:22.2 -24:10:34  4.2  1.27  86
PPM 266859     17:26:01.2 -23:10:19  8.4  0.47  86
PPM 266902     17:28:07.4 -23:14:30  9.4  0.29  86
469506         17:27:50.0 -22:57:22 16.5        86
Positions are for J2000

Event circumstances last updated at 2024/03/05 04:30:28 UT

Marc W. Buie, Southwest Research Institute

RECON