RECON: TNO occultation with 13KY18

Event between 13KY18 and star GA0640:23379449 with event index number of 2063538

Geocentric closest approach at 2023/05/24 05:36:43 UTC

J2000 position of star is 18:08:40.1 -24:12:59
Equinox of date position of star is 18:10:01.7 -24:12:41
Stellar brightness G=15.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 156 degrees from the moon. Moon is 20% illuminated.
TNO apparent brightness V=21.4

TNO is 29.4 AU from the Sun and 28.5 AU from the Earth.
The TNO is moving 20.0 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 110 seconds.
The 1-sigma cross-track error in the shadow position is 1056 km.

The TNO has an absolute magnitude Hv=6.7
Diameter=271.7 km assuming a 5% albedo -- 13.6 sec chord
Diameter=110.9 km assuming a 30% albedo -- 5.6 sec chord
Dynamical classification is 1:1
 
 
 
 
 
 
 
 

Star training set for 13KY18, (2023/05/24 05:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:50.7 -26:28:55  0.9 22.51 134
Nunki          18:56:42.8 -26:15:56  2.0 10.73 167
11 Sgr         18:13:09.0 -23:41:40  4.5  0.87 157
PPM 267950     18:10:43.5 -23:58:58  7.9  0.27 156
PPM 267933     18:10:20.1 -24:21:09  8.6  0.15 156
13KY18         18:10:06.1 -24:12:40 15.0       156
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, (2023/05/24 05:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 22.51 134
Nunki          18:55:15.9 -26:17:49  2.0 10.73 167
11 Sgr         18:11:43.4 -23:42:05  4.5  0.87 157
PPM 267950     18:09:17.7 -23:59:18  7.9  0.27 156
PPM 267933     18:08:54.1 -24:21:29  8.6  0.15 156
13KY18         18:08:40.1 -24:12:59 15.0       156
Positions are for J2000

Event circumstances last updated at 2022/03/12 02:00:28 UT

Marc W. Buie, Southwest Research Institute

RECON