RECON: TNO occultation with 98UR43

Event between 98UR43 and star UC4-585-015126 with event index number of 95954

Geocentric closest approach at 2017/12/18 00:48:18 UTC

J2000 position of star is 05:12:33.9 +26:57:45
Equinox of date position of star is 05:13:38.9 +26:58:55
Stellar brightness R=14.1, use SENSEUP=64
Star is 171 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=23.1

TNO is 30.8 AU from the Sun and 29.8 AU from the Earth.
The TNO is moving 24.2 km/sec on the sky relative to the star, or, 4.0 arcsec/hr.
The 1-sigma error in the time of the event is 394 seconds.
The 1-sigma cross-track error in the shadow position is 2570 km.

The TNO has an absolute magnitude Hv=8.3
Diameter=129.4 km assuming a 5% albedo -- 5.3 sec chord
Diameter=52.8 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 98UR43, (2017/12/18 00:48UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:57.2 +16:32:38  0.8 13.47 166
Alnath         05:27:25.7 +28:37:16  1.6  3.45 170
PPM 094057     05:07:00.2 +26:27:10  6.4  1.58 170
PPM 094169     05:13:28.4 +26:28:28  8.1  0.51 171
PPM 094184     05:14:52.5 +27:15:34 10.1  0.38 171
98UR43         05:13:41.1 +26:58:58 14.1       171
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, (2017/12/18 00:48UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 13.47 166
Alnath         05:26:17.5 +28:36:24  1.6  3.45 170
PPM 094057     05:05:53.4 +26:25:47  6.4  1.58 170
PPM 094169     05:12:21.4 +26:27:14  8.1  0.51 171
PPM 094184     05:13:45.2 +27:14:22 10.1  0.38 171
98UR43         05:12:33.9 +26:57:45 14.1       171
Positions are for J2000

Event circumstances last updated at 2017/05/17 17:57:41 UT

Marc W. Buie, Southwest Research Institute

RECON