RECON: TNO occultation with 328884

Event between (328884) 10LJ109 and star UC4-225-170916 with event index number of 128298

Geocentric closest approach at 2018/06/16 22:13:57 UTC

J2000 position of star is 18:25:29.2 -45:08:44
Equinox of date position of star is 18:26:43.1 -45:08:06
Stellar brightness R=16.4
Star is 140 degrees from the moon. Moon is 14% illuminated.
TNO apparent brightness V=21.2

TNO is 12.5 AU from the Sun and 11.6 AU from the Earth.
The TNO is moving 21.3 km/sec on the sky relative to the star, or, 9.1 arcsec/hr.
The 1-sigma error in the time of the event is 127 seconds.
The 1-sigma cross-track error in the shadow position is 832 km.

The TNO has an absolute magnitude Hv=10.2
Diameter=55.0 km assuming a 5% albedo -- 2.6 sec chord
Diameter=22.4 km assuming a 30% albedo -- 1.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 328884, (2018/06/16 22:14UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.5 -26:28:17  0.9 29.79 121
The Sco        17:38:38.8 -43:00:28  1.9  8.90 133
Alp Tel        18:28:20.5 -45:57:23  3.5  0.86 140
PPM 324066     18:26:38.5 -44:34:52  8.0  0.55 140
PPM 324092     18:27:48.5 -45:08:09  9.8  0.17 140
328884         18:26:50.6 -45:08:02 16.4       140
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 328884, (2018/06/16 22:14UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:55  0.9 29.79 121
The Sco        17:37:19.2 -42:59:52  1.9  8.90 133
Alp Tel        18:26:58.4 -45:58:07  3.5  0.86 140
PPM 324066     18:25:17.6 -44:35:34  8.0  0.55 140
PPM 324092     18:26:27.1 -45:08:52  9.8  0.17 140
328884         18:25:29.2 -45:08:44 16.4       140
Positions are for J2000

Event circumstances last updated at 2016/10/09 17:28:31 UT

Marc W. Buie, Southwest Research Institute

RECON