RECON: TNO occultation with 471143

Event between (471143) 10EK139 and star UC4-254-063854 with event index number of 146046

Geocentric closest approach at 2018/02/20 05:01:31 UTC

J2000 position of star is 14:02:48.0 -39:13:05
Equinox of date position of star is 14:03:51.2 -39:18:04
Stellar brightness R=15.0, use SENSEUP=128
Star is 144 degrees from the moon. Moon is 18% illuminated.
TNO apparent brightness V=19.7

TNO is 36.4 AU from the Sun and 36.1 AU from the Earth.
The TNO is moving 14.2 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 166 seconds.
The 1-sigma cross-track error in the shadow position is 2428 km.

The TNO has an absolute magnitude Hv=3.9
Diameter=1000.0 km assuming a 5% albedo -- 70.6 sec chord
Diameter=408.3 km assuming a 30% albedo -- 28.8 sec chord
Dynamical classification is 7:2EEEEE
 
 
 
 
 
 
 
 

Star training set for 471143, (2018/02/20 05:02UT)
Object            RA         Dec     mag  sep  mel
Hadar          14:05:07.2 -60:27:34  0.6 21.16 123
5The Cen       14:07:45.4 -36:27:30  2.1  2.95 147
PPM 319095     14:02:25.2 -40:18:32  5.8  1.04 143
PPM 292109     14:02:22.7 -39:20:25  8.0  0.30 144
PPM 292152     14:04:44.9 -39:21:17  9.0  0.17 144
471143         14:03:54.0 -39:18:17 15.0       144
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 471143, (2018/02/20 05:02UT)
Object            RA         Dec     mag  sep  mel
Hadar          14:03:49.3 -60:22:23  0.6 21.16 123
5The Cen       14:06:40.2 -36:22:21  2.1  2.95 147
PPM 319095     14:01:19.0 -40:13:19  5.8  1.04 143
PPM 292109     14:01:16.9 -39:15:12  8.0  0.30 144
PPM 292152     14:03:38.8 -39:16:06  9.0  0.17 144
471143         14:02:48.0 -39:13:05 15.0       144
Positions are for J2000

Event circumstances last updated at 2017/05/17 18:02:07 UT

Marc W. Buie, Southwest Research Institute

RECON