RECON: TNO occultation with 98UR43

Event between 98UR43 and star GA1180:02030886 with event index number of 1142228

Geocentric closest approach at 2021/08/31 13:18:06 UTC

J2000 position of star is 05:59:25.3 +28:20:35
Equinox of date position of star is 06:00:46.6 +28:20:34
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 9 degrees from the moon. Moon is 38% illuminated.
TNO apparent brightness V=23.4

TNO is 31.0 AU from the Sun and 31.3 AU from the Earth.
The TNO is moving 16.7 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 1100 seconds.
The 1-sigma cross-track error in the shadow position is 3979 km.

The TNO has an absolute magnitude Hv=8.3
Diameter=131.2 km assuming a 5% albedo -- 7.9 sec chord
Diameter=53.6 km assuming a 30% albedo -- 3.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 98UR43, (2021/08/31 13:18UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:20.7 +07:24:34  0.4 20.96  19
Alnath         05:27:39.8 +28:37:25  1.6  7.28   4
PPM 095226     06:02:22.2 +27:34:18  6.0  0.85   9
PPM 095207     06:01:27.1 +28:07:31  8.3  0.26   9
PPM 095196     06:00:36.7 +28:17:24 12.0  0.07   9
98UR43         06:00:47.6 +28:20:34 16.5         9
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 98UR43, (2021/08/31 13:18UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 20.96  19
Alnath         05:26:17.5 +28:36:23  1.6  7.28   4
PPM 095226     06:01:00.4 +27:34:21  6.0  0.85   9
PPM 095207     06:00:05.0 +28:07:33  8.3  0.26   9
PPM 095196     05:59:14.5 +28:17:24 12.0  0.07   9
98UR43         05:59:25.3 +28:20:35 16.5         9
Positions are for J2000

Event circumstances last updated at 2021/06/02 03:34:29 UT

Marc W. Buie, Southwest Research Institute

RECON