RECON: TNO occultation with 04KZ18

Event between 04KZ18 and star UC4-391-072973 with event index number of 130511

Geocentric closest approach at 2018/07/16 22:13:35 UTC

J2000 position of star is 17:14:30.7 -11:48:58
Equinox of date position of star is 17:15:28.9 -11:50:06
Stellar brightness R=16.1, use SENSEUP=128
Star is 91 degrees from the moon. Moon is 20% illuminated.
TNO apparent brightness V=24.0

TNO is 34.7 AU from the Sun and 33.9 AU from the Earth.
The TNO is moving 18.3 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 612 seconds.
The 1-sigma cross-track error in the shadow position is 3982 km.

The TNO has an absolute magnitude Hv=8.5
Diameter=119.7 km assuming a 5% albedo -- 6.5 sec chord
Diameter=48.9 km assuming a 30% albedo -- 2.7 sec chord
Dynamical classification is 5:2EEE+5:2EII
 
 
 
 
 
 
 
 

Star training set for 04KZ18, (2018/07/16 22:14UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.8 -26:28:18  0.9 18.06  83
35Eta Oph      17:11:26.6 -15:44:48  2.6  4.04  90
PPM 232685     17:10:49.5 -10:32:46  5.6  1.73  89
PPM 232885     17:18:54.1 -12:19:54  8.4  0.96  91
PPM 232801     17:15:00.8 -11:36:58  9.3  0.26  90
04KZ18         17:15:32.8 -11:50:11 16.1        91
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 04KZ18, (2018/07/16 22:14UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 18.06  83
35Eta Oph      17:10:22.7 -15:43:29  2.6  4.04  90
PPM 232685     17:09:48.0 -10:31:26  5.6  1.73  89
PPM 232885     17:17:51.8 -12:18:47  8.4  0.96  91
PPM 232801     17:13:58.8 -11:35:45  9.3  0.26  90
04KZ18         17:14:30.7 -11:48:58 16.1        91
Positions are for J2000

Event circumstances last updated at 2017/05/14 18:42:19 UT

Marc W. Buie, Southwest Research Institute

RECON