RECON: TNO occultation with 523700

Event between (523700) 14GM54 and star GA1080:15599240 with event index number of 2089132

Geocentric closest approach at 2023/06/17 03:35:01 UTC

J2000 position of star is 20:07:02.0 +18:29:10
Equinox of date position of star is 20:08:03.3 +18:33:11
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 114 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=21.8

TNO is 28.1 AU from the Sun and 27.5 AU from the Earth.
The TNO is moving 18.6 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 99 seconds.
The 1-sigma cross-track error in the shadow position is 1367 km.

The TNO has an absolute magnitude Hv=7.2
Diameter=229.1 km assuming a 5% albedo -- 12.0 sec chord
Diameter=93.5 km assuming a 30% albedo -- 4.9 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 
 
 

Star training set for 523700, (2023/06/17 03:35UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:13.9 +45:21:54  1.3 27.73  91
Tarazed        19:47:22.5 +10:40:19  2.7  9.34 123
16Eta Sge      20:06:11.9 +20:03:34  5.1  1.57 114
PPM 137710     20:09:05.0 +18:54:23  8.3  0.42 114
PPM 137661     20:07:59.3 +18:36:11  9.6  0.05 114
523700         20:08:05.2 +18:33:18 16.0       114
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 523700, (2023/06/17 03:35UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 27.73  91
Tarazed        19:46:15.6 +10:36:48  2.7  9.34 123
16Eta Sge      20:05:09.5 +19:59:29  5.1  1.57 114
PPM 137710     20:08:01.9 +18:50:13  8.3  0.42 114
PPM 137661     20:06:56.1 +18:32:03  9.6  0.05 114
523700         20:07:02.0 +18:29:10 16.0       114
Positions are for J2000

Event circumstances last updated at 2022/10/04 04:20:22 UT

Marc W. Buie, Southwest Research Institute

RECON