RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star UC4-817-023910 with event index number of 91724

Geocentric closest approach at 2017/11/07 16:38:49 UTC

J2000 position of star is 19:51:17.7 +73:19:13
Equinox of date position of star is 19:51:02.5 +73:21:55
Stellar brightness R=15.4, use SENSEUP=128
Star is 86 degrees from the moon. Moon is 83% illuminated.
TNO apparent brightness V=20.2

TNO is 11.3 AU from the Sun and 11.0 AU from the Earth.
The TNO is moving 37.6 km/sec on the sky relative to the star, or, 17.0 arcsec/hr.
The 1-sigma error in the time of the event is 26 seconds.
The 1-sigma cross-track error in the shadow position is 466 km.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 2.2 sec chord
Diameter=34.0 km assuming a 30% albedo -- 0.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 342842, (2017/11/07 16:39UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:02.5 +45:20:41  1.3 28.62 107
Alderamin      21:19:00.3 +62:39:42  2.4 13.34  90
60Tau Dra      19:15:11.7 +73:23:17  4.4  2.56  86
PPM 010289     19:43:02.1 +72:24:20  8.5  1.13  87
PPM 010313     19:47:50.8 +73:38:27 10.0  0.36  85
PPM 010310     19:47:23.5 +73:21:58 10.2  0.26  86
342842         19:51:02.1 +73:22:00 15.4        86
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 342842, (2017/11/07 16:39UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 28.62 107
Alderamin      21:18:35.2 +62:35:09  2.4 13.34  90
60Tau Dra      19:15:32.4 +73:21:21  4.4  2.56  86
PPM 010289     19:43:14.8 +72:21:45  8.5  1.13  87
PPM 010313     19:48:08.2 +73:35:45 10.0  0.36  85
PPM 010310     19:47:39.8 +73:19:16 10.2  0.26  86
342842         19:51:17.7 +73:19:13 15.4        86
Positions are for J2000

Event circumstances last updated at 2017/05/16 18:35:25 UT

Marc W. Buie, Southwest Research Institute

RECON