RECON: TNO occultation with 523706

Event between (523706) 14HF200 and star GA0580:15623867 with event index number of 2379596

Geocentric closest approach at 2026/05/23 01:45:21 UTC

J2000 position of star is 17:03:49.8 -31:08:50
Equinox of date position of star is 17:05:24.2 -31:10:48
Stellar brightness G=14.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 111 degrees from the moon. Moon is 46% illuminated.
Apparent brightness V=21.4

Object is 35.9 AU from the Sun and 35.0 AU from the Earth.
Apparent velocity is 22.4 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 944 seconds.
The 1-sigma cross-track error in the shadow position is 4827 km.

The object has an absolute magnitude Hv=5.8
Diameter=398.1 km assuming a 5% albedo -- 18.5 sec chord
Diameter=162.5 km assuming a 30% albedo -- 7.5 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 523706, (2026/05/23 01:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:01.8 -26:29:18  0.9  8.89 103
26Eps Sco      16:51:52.9 -34:20:18  2.3  4.26 108
PPM 295807     17:03:35.3 -32:10:49  5.0  1.08 110
PPM 295835     17:05:00.2 -31:39:01  7.2  0.48 111
PPM 295862     17:06:25.6 -31:12:24  9.4  0.19 111
523706         17:05:31.6 -31:10:57 14.9       111
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 523706, (2026/05/23 01:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  8.89 103
26Eps Sco      16:50:08.7 -34:17:41  2.3  4.26 108
PPM 295807     17:01:52.6 -32:08:38  5.0  1.08 110
PPM 295835     17:03:18.0 -31:36:53  7.2  0.48 111
PPM 295862     17:04:43.7 -31:10:19  9.4  0.19 111
523706         17:03:49.8 -31:08:50 14.9       111
Positions are for J2000

Event circumstances last updated at 2024/06/19 21:25:06 UT

Marc W. Buie, Southwest Research Institute

RECON