RECON: TNO occultation with 13KY18

Event between 13KY18 and star GA0660:20675918 with event index number of 1168006

Geocentric closest approach at 2021/04/21 21:48:58 UTC

J2000 position of star is 17:51:01.4 -23:39:07
Equinox of date position of star is 17:52:19.4 -23:39:22
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 126 degrees from the moon. Moon is 67% illuminated.
TNO apparent brightness V=21.6

TNO is 29.7 AU from the Sun and 29.1 AU from the Earth.
The TNO is moving 10.6 km/sec on the sky relative to the star, or, 1.8 arcsec/hr.
The 1-sigma error in the time of the event is 777 seconds.
The 1-sigma cross-track error in the shadow position is 1867 km.

The TNO has an absolute magnitude Hv=6.7
Diameter=272.9 km assuming a 5% albedo -- 25.6 sec chord
Diameter=111.4 km assuming a 30% albedo -- 10.5 sec chord
Dynamical classification is 1:1
 
 
 
 
 
 
 
 

Star training set for 13KY18, (2021/04/21 21:49UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.0 -26:28:39  0.9 18.67 109
35Eta Oph      17:11:36.1 -15:44:59  2.6 12.42 116
PPM 267309     17:49:02.9 -22:29:02  6.1  1.39 126
PPM 267352     17:50:38.4 -23:22:29  8.2  0.48 126
PPM 267403     17:52:28.3 -23:58:00  9.7  0.31 126
13KY18         17:52:19.4 -23:39:22 16.0       127
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 13KY18, (2021/04/21 21:49UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 18.67 109
35Eta Oph      17:10:22.7 -15:43:29  2.6 12.42 116
PPM 267309     17:47:45.6 -22:28:40  6.1  1.39 126
PPM 267352     17:49:20.6 -23:22:10  8.2  0.48 126
PPM 267403     17:51:10.1 -23:57:45  9.7  0.31 126
13KY18         17:51:01.4 -23:39:07 16.0       126
Positions are for J2000

Event circumstances last updated at 2021/04/21 22:32:03 UT

Marc W. Buie, Southwest Research Institute

RECON