RECON: TNO occultation with 469987

Event between (469987) 06HJ123 and star UC4-370-074891 with event index number of 147368

Geocentric closest approach at 2018/07/11 21:48:27 UTC

J2000 position of star is 16:07:32.4 -16:05:09
Equinox of date position of star is 16:08:33.6 -16:07:57
Stellar brightness R=12.9, use SENSEUP=32
Star is 151 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=21.3

TNO is 34.1 AU from the Sun and 33.4 AU from the Earth.
The TNO is moving 15.1 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 158 seconds.
The 1-sigma cross-track error in the shadow position is 1359 km.

The TNO has an absolute magnitude Hv=5.9
Diameter=398.1 km assuming a 5% albedo -- 26.3 sec chord
Diameter=162.5 km assuming a 30% albedo -- 10.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 469987, (2018/07/11 21:48UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.8 -26:28:18  0.9 11.53 156
8Bet1Sco       16:06:31.0 -19:51:17  2.6  3.75 151
49 Lib         16:01:22.2 -16:35:12  5.5  1.79 149
PPM 231220     16:07:56.4 -16:11:41  8.4  0.17 150
PPM 231237     16:08:35.6 -16:08:34 10.0  0.01 151
469987         16:08:35.7 -16:08:03 12.9       151
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 469987, (2018/07/11 21:48UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 11.53 156
8Bet1Sco       16:05:26.2 -19:48:20  2.6  3.75 151
49 Lib         16:00:18.8 -16:32:07  5.5  1.79 149
PPM 231220     16:06:53.1 -16:08:46  8.4  0.17 150
PPM 231237     16:07:32.3 -16:05:40 10.0  0.01 151
469987         16:07:32.4 -16:05:09 12.9       151
Positions are for J2000

Event circumstances last updated at 2017/12/04 18:50:22 UT

Marc W. Buie, Southwest Research Institute

RECON