RECON: TNO occultation with 119979

Event between (119979) 02WC19 and star UC4-550-020640 with event index number of 164965

Geocentric closest approach at 2018/11/18 23:18:18 UTC

J2000 position of star is 05:54:29.0 +19:55:42
Equinox of date position of star is 05:55:32.8 +19:55:49
Stellar brightness R=16.5, use SENSEUP=128
Star is 85 degrees from the moon. Moon is 80% illuminated.
TNO apparent brightness V=21.0

TNO is 40.4 AU from the Sun and 39.5 AU from the Earth.
The TNO is moving 20.8 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 895 seconds.
The 1-sigma cross-track error in the shadow position is 3846 km.

The TNO has an absolute magnitude Hv=4.9
Diameter=631.0 km assuming a 5% albedo -- 30.4 sec chord
Diameter=257.6 km assuming a 30% albedo -- 12.4 sec chord
Dynamical classification is 2:1E
 
 
 
 
 
 
 
 

Star training set for 119979, (2018/11/18 23:18UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:11.7 +07:24:33  0.4 12.52  84
Alnath         05:27:29.2 +28:37:18  1.6 10.79  79
57 Ori         05:56:03.7 +19:45:06  5.6  0.21  85
PPM 121584     05:56:06.7 +19:36:24  8.4  0.35  85
57 Ori         05:56:03.7 +19:45:06  5.6  0.21  85
119979         05:55:36.2 +19:55:50 16.5        85
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 119979, (2018/11/18 23:18UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 12.52  84
Alnath         05:26:17.5 +28:36:24  1.6 10.79  79
57 Ori         05:54:56.6 +19:44:58  5.6  0.21  85
PPM 121584     05:54:59.6 +19:36:16  8.4  0.35  85
57 Ori         05:54:56.6 +19:44:58  5.6  0.21  85
119979         05:54:29.0 +19:55:42 16.5        85
Positions are for J2000

Event circumstances last updated at 2017/12/05 19:03:14 UT

Marc W. Buie, Southwest Research Institute

RECON