RECON: TNO occultation with 98UR43

Event between 98UR43 and star UC4-589-019934 with event index number of 209852

Geocentric closest approach at 2019/08/18 14:35:22 UTC

J2000 position of star is 05:37:55.0 +27:37:50
Equinox of date position of star is 05:39:02.6 +27:38:23
Stellar brightness R=16.5, use SENSEUP=128
Star is 87 degrees from the moon. Moon is 92% illuminated.
TNO apparent brightness V=23.4

TNO is 30.9 AU from the Sun and 31.4 AU from the Earth.
The TNO is moving 20.4 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 698 seconds.
The 1-sigma cross-track error in the shadow position is 4604 km.

The TNO has an absolute magnitude Hv=8.3
Diameter=129.4 km assuming a 5% albedo -- 6.3 sec chord
Diameter=52.8 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 98UR43, (2019/08/18 14:35UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:03.0 +16:32:50  0.8 18.13  70
Alnath         05:27:32.1 +28:37:20  1.6  2.74  84
PPM 094572     05:38:22.5 +26:56:06  5.6  0.73  86
PPM 094540     05:37:09.5 +27:40:24  7.9  0.44  86
PPM 094587     05:38:54.8 +27:16:54  9.3  0.36  86
98UR43         05:39:09.0 +27:38:27 16.5        87
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, (2019/08/18 14:35UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 18.13  70
Alnath         05:26:17.5 +28:36:24  1.6  2.74  84
PPM 094572     05:37:08.9 +26:55:28  5.6  0.73  86
PPM 094540     05:35:55.5 +27:39:44  7.9  0.44  86
PPM 094587     05:37:41.0 +27:16:17  9.3  0.36  86
98UR43         05:37:55.0 +27:37:50 16.5        86
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:12:50 UT

Marc W. Buie, Southwest Research Institute

RECON