RECON: TNO occultation with 123509

Event between (123509) 00WK183 and star UC4-558-022143 with event index number of 147951

Geocentric closest approach at 2018/09/09 13:39:10 UTC

J2000 position of star is 05:55:20.1 +21:29:39
Equinox of date position of star is 05:56:23.4 +21:29:45
Stellar brightness R=14.7, use SENSEUP=128
Star is 76 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=23.1

TNO is 42.6 AU from the Sun and 42.8 AU from the Earth.
The TNO is moving 10.6 km/sec on the sky relative to the star, or, 1.2 arcsec/hr.
The 1-sigma error in the time of the event is 3132 seconds.
The 1-sigma cross-track error in the shadow position is 2771 km.

The TNO has an absolute magnitude Hv=6.6
Diameter=288.4 km assuming a 5% albedo -- 27.3 sec chord
Diameter=117.7 km assuming a 30% albedo -- 11.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 123509, (2018/09/09 13:39UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:11.0 +07:24:33  0.4 14.09  77
Alnath         05:27:28.5 +28:37:18  1.6  9.68  81
54Chi1Ori      05:55:29.4 +20:16:41  5.1  1.24  76
PPM 095070     05:56:07.7 +21:24:29  8.0  0.12  76
123509         05:56:27.4 +21:29:46 14.7        75
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, (2018/09/09 13:39UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 14.09  77
Alnath         05:26:17.5 +28:36:24  1.6  9.68  81
54Chi1Ori      05:54:22.7 +20:16:33  5.1  1.24  76
PPM 095070     05:55:00.4 +21:24:22  8.0  0.12  76
123509         05:55:20.1 +21:29:39 14.7        76
Positions are for J2000

Event circumstances last updated at 2017/08/02 16:56:45 UT

Marc W. Buie, Southwest Research Institute

RECON