RECON: TNO occultation with 523673

Event between (523673) 13MZ11 and star GA0780:22066996 with event index number of 1101289

Geocentric closest approach at 2021/08/07 04:14:11 UTC

J2000 position of star is 22:53:19.1 -11:51:20
Equinox of date position of star is 22:54:26.2 -11:44:32
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 138 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=21.0

TNO is 19.1 AU from the Sun and 18.2 AU from the Earth.
The TNO is moving 19.3 km/sec on the sky relative to the star, or, 5.3 arcsec/hr.
The 1-sigma error in the time of the event is 40 seconds.
The 1-sigma cross-track error in the shadow position is 723 km.

The TNO has an absolute magnitude Hv=8.1
Diameter=144.5 km assuming a 5% albedo -- 7.5 sec chord
Diameter=59.0 km assuming a 30% albedo -- 3.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 523673, (2021/08/07 04:14UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:50.4 -29:30:26  1.2 17.80 141
74 Aqr         22:54:36.8 -11:30:04  6.1  0.24 138
PPM 240883     22:54:02.7 -11:52:46  9.6  0.17 138
523673         22:54:27.2 -11:44:25 16.4       138
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 523673, (2021/08/07 04:14UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 17.80 141
74 Aqr         22:53:28.7 -11:37:00  6.1  0.24 138
PPM 240883     22:52:54.6 -11:59:41  9.6  0.17 138
523673         22:53:19.1 -11:51:20 16.4       138
Positions are for J2000

Event circumstances last updated at 2021/04/08 23:42:40 UT

Marc W. Buie, Southwest Research Institute

RECON