RECON: TNO occultation with 459865

Event between (459865) 13XZ8 and star GA0640:09816851 with event index number of 2282936

Geocentric closest approach at 2025/07/16 14:34:04 UTC

J2000 position of star is 16:59:37.4 -25:43:13
Equinox of date position of star is 17:01:07.8 -25:45:19
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 109 degrees from the moon. Moon is 66% illuminated.
Apparent brightness V=19.6

Object is 9.9 AU from the Sun and 9.1 AU from the Earth.
Apparent velocity is 14.4 km/sec on the sky relative to the star, or, 7.8 arcsec/hr.
The 1-sigma error in the time of the event is 43 seconds.
The 1-sigma cross-track error in the shadow position is 426 km.

The object has an absolute magnitude Hv=9.5
Diameter=70.8 km assuming a 5% albedo -- 5.3 sec chord
Diameter=28.9 km assuming a 30% albedo -- 2.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 459865, (2025/07/16 14:37UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.7 -26:29:11  0.9  6.82 116
23Tau Sco      16:37:28.6 -28:16:00  2.8  5.85 114
26 Oph         17:01:43.6 -25:01:33  5.8  0.74 109
PPM 266202     16:59:51.4 -26:05:46  7.4  0.45 110
PPM 266236     17:01:02.9 -25:44:10  9.2  0.04 109
459865         17:01:11.8 -25:45:24 16.0       109
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 459865, (2025/07/16 14:37UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  6.82 116
23Tau Sco      16:35:52.9 -28:12:58  2.8  5.85 114
26 Oph         17:00:09.6 -24:59:22  5.8  0.74 109
PPM 266202     16:58:16.7 -26:03:32  7.4  0.45 110
PPM 266236     16:59:28.5 -25:41:58  9.2  0.04 109
459865         16:59:37.4 -25:43:13 16.0       109
Positions are for J2000

Event circumstances last updated at 2024/06/13 03:59:13 UT

Marc W. Buie, Southwest Research Institute

RECON