RECON: TNO occultation with 123509

Event between (123509) 00WK183 and star UC4-558-019076 with event index number of 114021

Geocentric closest approach at 2018/04/09 00:44:43 UTC

J2000 position of star is 05:41:57.3 +21:26:37
Equinox of date position of star is 05:43:00.6 +21:27:04
Stellar brightness R=15.8, use SENSEUP=128
Star is 149 degrees from the moon. Moon is 43% illuminated.
TNO apparent brightness V=23.1

TNO is 42.6 AU from the Sun and 43.0 AU from the Earth.
The TNO is moving 15.9 km/sec on the sky relative to the star, or, 1.8 arcsec/hr.
The 1-sigma error in the time of the event is 2088 seconds.
The 1-sigma cross-track error in the shadow position is 4070 km.

The TNO has an absolute magnitude Hv=6.6
Diameter=288.4 km assuming a 5% albedo -- 18.2 sec chord
Diameter=117.7 km assuming a 30% albedo -- 7.4 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 123509, (2018/04/09 00:45UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:09.7 +07:24:32  0.4 14.39 149
Alnath         05:27:26.9 +28:37:16  1.6  7.99 145
PPM 094621     05:40:33.0 +21:46:18  6.4  0.66 148
PPM 094742     05:44:27.7 +21:25:23  8.5  0.33 149
PPM 094702     05:43:09.7 +21:35:02  9.6  0.14 149
PPM 094708     05:43:19.3 +21:23:14 10.1  0.09 149
123509         05:43:03.0 +21:27:05 15.8       149
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 123509, (2018/04/09 00:45UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 14.39 149
Alnath         05:26:17.5 +28:36:24  1.6  7.99 145
PPM 094621     05:39:27.1 +21:45:46  6.4  0.66 148
PPM 094742     05:43:22.0 +21:24:57  8.5  0.33 149
PPM 094702     05:42:03.9 +21:34:34  9.6  0.14 149
PPM 094708     05:42:13.6 +21:22:46 10.1  0.09 149
123509         05:41:57.3 +21:26:37 15.8       149
Positions are for J2000

Event circumstances last updated at 2017/08/01 16:36:29 UT

Marc W. Buie, Southwest Research Institute

RECON