RECON: TNO occultation with 328884

Event between (328884) 10LJ109 and star UC4-240-160986 with event index number of 105742

Geocentric closest approach at 2018/02/25 15:43:18 UTC

J2000 position of star is 18:29:30.9 -42:05:13
Equinox of date position of star is 18:30:42.6 -42:04:28
Stellar brightness R=14.4
Star is 158 degrees from the moon. Moon is 75% illuminated.
TNO apparent brightness V=21.6

TNO is 12.4 AU from the Sun and 12.8 AU from the Earth.
The TNO is moving 25.1 km/sec on the sky relative to the star, or, 9.8 arcsec/hr.
The 1-sigma error in the time of the event is 112 seconds.
The 1-sigma cross-track error in the shadow position is 1404 km.

The TNO has an absolute magnitude Hv=10.2
Diameter=55.0 km assuming a 5% albedo -- 2.2 sec chord
Diameter=22.4 km assuming a 30% albedo -- 0.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 328884, (2018/02/25 15:43UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:31.4 -26:28:15  0.9 29.11 151
Kap Sco        17:43:44.7 -39:02:15  2.4  9.43 158
PPM 324175     18:32:20.3 -41:54:00  6.4  0.33 158
PPM 324142     18:30:33.1 -41:56:36  8.4  0.14 158
328884         18:30:48.4 -42:04:25 14.4       158
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, (2018/02/25 15:43UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:55  0.9 29.11 151
Kap Sco        17:42:29.3 -39:01:49  2.4  9.43 158
PPM 324175     18:31:02.9 -41:54:50  6.4  0.33 158
PPM 324142     18:29:15.6 -41:57:24  8.4  0.14 158
328884         18:29:30.9 -42:05:13 14.4       158
Positions are for J2000

Event circumstances last updated at 2016/10/09 17:25:45 UT

Marc W. Buie, Southwest Research Institute

RECON