RECON: TNO occultation with 470309

Event between (470309) 07JK43 and star UC4-459-063605 with event index number of 147128

Geocentric closest approach at 2018/08/06 01:14:04 UTC

J2000 position of star is 17:16:56.9 +01:41:50
Equinox of date position of star is 17:17:51.3 +01:40:44
Stellar brightness R=16.6, use SENSEUP=128
Star is 154 degrees from the moon. Moon is 36% illuminated.
TNO apparent brightness V=21.0

TNO is 24.3 AU from the Sun and 23.8 AU from the Earth.
The TNO is moving 12.3 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 111 seconds.
The 1-sigma cross-track error in the shadow position is 1219 km.

The TNO has an absolute magnitude Hv=7.0
Diameter=239.9 km assuming a 5% albedo -- 19.6 sec chord
Diameter=97.9 km assuming a 30% albedo -- 8.0 sec chord
Dynamical classification is CENTAURS
 
 
 
 
 
 
 
 

Star training set for 470309, (2018/08/06 01:14UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:33.0 -26:28:18  0.9 30.38 166
60Bet Oph      17:44:23.5 +04:33:39  2.8  7.22 147
PPM 163749     17:17:28.4 +01:11:28  5.9  0.50 154
PPM 163775     17:18:33.4 +01:43:25  7.1  0.17 153
PPM 163753     17:17:46.4 +01:38:37  9.7  0.05 154
470309         17:17:53.4 +01:40:41 16.6       153
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 470309, (2018/08/06 01:14UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 30.38 166
60Bet Oph      17:43:28.3 +04:34:05  2.8  7.22 147
PPM 163749     17:16:31.7 +01:12:38  5.9  0.50 154
PPM 163775     17:17:36.9 +01:44:33  7.1  0.17 153
PPM 163753     17:16:49.9 +01:39:46  9.7  0.05 154
470309         17:16:56.9 +01:41:50 16.6       153
Positions are for J2000

Event circumstances last updated at 2017/12/05 18:51:36 UT

Marc W. Buie, Southwest Research Institute

RECON