RECON: TNO occultation with 11JY31

Event between 11JY31 and star UC4-349-168113 with event index number of 203190

Geocentric closest approach at 2018/06/18 01:20:36 UTC

J2000 position of star is 19:09:14.5 -20:18:18
Equinox of date position of star is 19:10:18.1 -20:16:30
Stellar brightness R=15.3, use SENSEUP=128
Star is 140 degrees from the moon. Moon is 24% illuminated.
TNO apparent brightness V=25.1

TNO is 42.4 AU from the Sun and 41.5 AU from the Earth.
The TNO is moving 22.9 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 600 seconds.
The 1-sigma cross-track error in the shadow position is 4243 km.

The TNO has an absolute magnitude Hv=8.8
Diameter=103.8 km assuming a 5% albedo -- 4.5 sec chord
Diameter=42.4 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 11JY31, (2018/06/18 01:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.5 -26:28:17  0.9 37.04 104
Nunki          18:56:24.5 -26:16:20  2.0  6.80 137
PPM 235581     19:10:53.4 -19:46:23  6.4  0.52 141
PPM 269387     19:10:44.4 -20:00:36  8.4  0.28 141
PPM 269376     19:10:10.5 -20:09:05  9.4  0.13 140
11JY31         19:10:20.0 -20:16:27 15.3       141
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 11JY31, (2018/06/18 01:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 37.04 104
Nunki          18:55:15.9 -26:17:49  2.0  6.80 137
PPM 235581     19:09:48.2 -19:48:15  6.4  0.52 141
PPM 269387     19:09:39.1 -20:02:28  8.4  0.28 141
PPM 269376     19:09:05.1 -20:10:56  9.4  0.13 140
11JY31         19:09:14.5 -20:18:18 15.3       140
Positions are for J2000

Event circumstances last updated at 2017/12/04 18:45:26 UT

Marc W. Buie, Southwest Research Institute

RECON