RECON: TNO occultation with 98UR43

Event between 98UR43 and star GA1180:01842375 with event index number of 1142305

Geocentric closest approach at 2022/04/17 14:08:34 UTC

J2000 position of star is 05:50:40.3 +28:29:05
Equinox of date position of star is 05:52:04.8 +28:29:22
Stellar brightness G=14.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 130 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=23.4

TNO is 31.0 AU from the Sun and 31.5 AU from the Earth.
The TNO is moving 20.0 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 695 seconds.
The 1-sigma cross-track error in the shadow position is 2429 km.

The TNO has an absolute magnitude Hv=8.3
Diameter=133.0 km assuming a 5% albedo -- 6.7 sec chord
Diameter=54.3 km assuming a 30% albedo -- 2.7 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 98UR43, (2022/04/17 14:09UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:12.1 +16:33:08  0.8 20.96 148
Alnath         05:27:42.2 +28:37:27  1.6  5.35 135
PPM 095117     05:57:58.8 +28:56:37  6.5  1.37 129
PPM 094981     05:52:57.4 +28:05:47  8.2  0.44 130
PPM 094987     05:53:12.9 +28:27:14  8.9  0.25 130
PPM 094968     05:52:25.4 +28:32:33 11.0  0.09 130
98UR43         05:52:05.0 +28:29:22 14.6       130
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, (2022/04/17 14:09UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 20.96 148
Alnath         05:26:17.5 +28:36:23  1.6  5.35 135
PPM 095117     05:56:33.8 +28:56:32  6.5  1.37 129
PPM 094981     05:51:33.0 +28:05:31  8.2  0.44 130
PPM 094987     05:51:48.2 +28:27:00  8.9  0.25 130
PPM 094968     05:51:00.6 +28:32:17 11.0  0.09 130
98UR43         05:50:40.3 +28:29:05 14.6       130
Positions are for J2000

Event circumstances last updated at 2022/04/02 01:10:39 UT

Marc W. Buie, Southwest Research Institute

RECON