RECON: TNO occultation with 523751

Event between (523751) 14UU224 and star GA0980:00854766 with event index number of 2362814

Geocentric closest approach at 2023/08/18 12:50:20 UTC

J2000 position of star is 05:34:41.5 +08:18:37
Equinox of date position of star is 05:35:54.0 +08:19:25
Stellar brightness G=16.6, 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 4% illuminated.
TNO apparent brightness V=22.3

TNO is 30.7 AU from the Sun and 31.1 AU from the Earth.
The TNO is moving 20.8 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 93 seconds.
The 1-sigma cross-track error in the shadow position is 1204 km.

The TNO has an absolute magnitude Hv=7.2
Diameter=223.9 km assuming a 5% albedo -- 10.8 sec chord
Diameter=91.4 km assuming a 30% albedo -- 4.4 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 523751, (2023/08/18 12:53UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:27.1 +07:24:34  0.4  5.15  81
Bellatrix      05:26:24.0 +06:22:09  1.6  3.08  89
PPM 149227     05:38:37.0 +08:57:53  5.8  0.91  85
PPM 149228     05:38:38.5 +07:40:53  8.2  0.92  85
PPM 149127     05:34:37.0 +08:33:12  9.1  0.41  86
PPM 149178     05:36:45.5 +08:29:08 10.4  0.25  86
523751         05:35:58.7 +08:19:28 16.6        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 523751, (2023/08/18 12:53UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  5.15  81
Bellatrix      05:25:07.8 +06:20:58  1.6  3.08  89
PPM 149227     05:37:19.3 +08:57:08  5.8  0.91  85
PPM 149228     05:37:21.6 +07:40:08  8.2  0.92  85
PPM 149127     05:33:19.6 +08:32:19  9.1  0.41  86
PPM 149178     05:35:28.2 +08:28:19 10.4  0.25  86
523751         05:34:41.5 +08:18:37 16.6        86
Positions are for J2000

Event circumstances last updated at 2022/03/12 02:03:15 UT

Marc W. Buie, Southwest Research Institute

RECON