RECON: TNO occultation with 469987

Event between (469987) 06HJ123 and star UC4-369-074504 with event index number of 147353

Geocentric closest approach at 2018/05/19 15:28:51 UTC

J2000 position of star is 16:12:12.1 -16:18:35
Equinox of date position of star is 16:13:09.1 -16:21:05
Stellar brightness R=15.1
Star is 129 degrees from the moon. Moon is 23% illuminated.
TNO apparent brightness V=21.2

TNO is 34.1 AU from the Sun and 33.1 AU from the Earth.
The TNO is moving 24.2 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 65 seconds.
The 1-sigma cross-track error in the shadow position is 1254 km.

The TNO has an absolute magnitude Hv=5.9
Diameter=398.1 km assuming a 5% albedo -- 16.5 sec chord
Diameter=162.5 km assuming a 30% albedo -- 6.7 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 469987, (2018/05/19 15:29UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.2 -26:28:16  0.9 10.88 134
8Bet1Sco       16:06:30.5 -19:51:16  2.6  3.85 128
PPM 231511     16:20:02.8 -14:54:59  5.8  2.18 130
PPM 231403     16:15:19.3 -16:35:10  8.3  0.55 129
PPM 231327     16:12:38.8 -16:22:29 10.0  0.15 129
469987         16:13:15.0 -16:21:21 15.1       129
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, (2018/05/19 15:29UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:55  0.9 10.88 134
8Bet1Sco       16:05:26.2 -19:48:20  2.6  3.85 128
PPM 231511     16:19:00.4 -14:52:22  5.8  2.18 130
PPM 231403     16:14:16.3 -16:32:27  8.3  0.55 129
PPM 231327     16:11:35.8 -16:19:42 10.0  0.15 129
469987         16:12:12.1 -16:18:35 15.1       129
Positions are for J2000

Event circumstances last updated at 2016/09/01 18:26:00 UT

Marc W. Buie, Southwest Research Institute

RECON