RECON: TNO occultation with 574398

Event between (574398) 10LO33 and star GA0840:18595791 with event index number of 2518853

Geocentric closest approach at 2022/11/22 20:52:10 UTC

J2000 position of star is 19:52:39.3 -05:20:08
Equinox of date position of star is 19:53:48.7 -05:16:41
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 74 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=21.0

TNO is 15.9 AU from the Sun and 16.4 AU from the Earth.
The TNO is moving 24.8 km/sec on the sky relative to the star, or, 7.5 arcsec/hr.
The 1-sigma error in the time of the event is 106 seconds.
The 1-sigma cross-track error in the shadow position is 1134 km.

The TNO has an absolute magnitude Hv=8.6
Diameter=116.4 km assuming a 5% albedo -- 4.7 sec chord
Diameter=47.5 km assuming a 30% albedo -- 1.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 574398, (2022/11/22 20:52UT)
Object            RA         Dec     mag  sep  mel
Tarazed        19:47:20.9 +10:40:14  2.7 16.03  77
PPM 203401     19:54:30.6 -03:03:13  5.6  2.23  75
PPM 203400     19:54:26.7 -05:28:47  7.9  0.25  74
PPM 203388     19:53:52.5 -05:29:28  8.8  0.22  74
574398         19:53:52.2 -05:16:30 16.6        74
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 574398, (2022/11/22 20:52UT)
Object            RA         Dec     mag  sep  mel
Tarazed        19:46:15.6 +10:36:48  2.7 16.03  77
PPM 203401     19:53:18.8 -03:06:52  5.6  2.23  75
PPM 203400     19:53:13.7 -05:32:26  7.9  0.25  74
PPM 203388     19:52:39.5 -05:33:05  8.8  0.22  74
574398         19:52:39.3 -05:20:08 16.6        74
Positions are for J2000

Event circumstances last updated at 2021/10/15 01:17:06 UT

Marc W. Buie, Southwest Research Institute

RECON