RECON: TNO occultation with 04KC19

Event between 04KC19 and star UC4-346-103794 with event index number of 130470

Geocentric closest approach at 2018/07/31 13:16:08 UTC

J2000 position of star is 17:34:11.7 -20:53:01
Equinox of date position of star is 17:35:14.7 -20:53:40
Stellar brightness R=16.3, use SENSEUP=128
Star is 85 degrees from the moon. Moon is 88% illuminated.
TNO apparent brightness V=23.4

TNO is 30.3 AU from the Sun and 29.5 AU from the Earth.
The TNO is moving 14.9 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 3237 seconds.
The 1-sigma cross-track error in the shadow position is 2631 km.

The TNO has an absolute magnitude Hv=8.5
Diameter=121.3 km assuming a 5% albedo -- 8.1 sec chord
Diameter=49.5 km assuming a 30% albedo -- 3.3 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 04KC19, (2018/07/31 13:16UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:33.0 -26:28:18  0.9 15.82  99
35Eta Oph      17:11:26.7 -15:44:48  2.6  7.65  91
PPM 267109     17:39:51.9 -21:55:19  6.4  1.48  84
PPM 267057     17:37:29.8 -20:59:16  8.4  0.52  85
PPM 267025     17:35:47.1 -20:47:40  9.3  0.15  85
04KC19         17:35:18.3 -20:53:42 16.3        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 04KC19, (2018/07/31 13:16UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 15.82  99
35Eta Oph      17:10:22.7 -15:43:29  2.6  7.65  91
PPM 267109     17:38:44.8 -21:54:46  6.4  1.48  84
PPM 267057     17:36:23.2 -20:58:38  8.4  0.52  85
PPM 267025     17:34:40.6 -20:47:00  9.3  0.15  85
04KC19         17:34:11.7 -20:53:01 16.3        85
Positions are for J2000

Event circumstances last updated at 2017/08/02 16:55:26 UT

Marc W. Buie, Southwest Research Institute

RECON