RECON: TNO occultation with 78799

Event between (78799) 02XW93 and star UC4-618-031801 with event index number of 92050

Geocentric closest approach at 2017/11/22 20:49:22 UTC

J2000 position of star is 06:03:17.8 +33:34:18
Equinox of date position of star is 06:04:27.4 +33:34:12
Stellar brightness R=15.0, use SENSEUP=128
Star is 158 degrees from the moon. Moon is 16% illuminated.
TNO apparent brightness V=22.1

TNO is 45.6 AU from the Sun and 44.7 AU from the Earth.
The TNO is moving 22.7 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 1304 seconds.
The 1-sigma cross-track error in the shadow position is 5572 km.

The TNO has an absolute magnitude Hv=5.5
Diameter=478.6 km assuming a 5% albedo -- 21.1 sec chord
Diameter=195.4 km assuming a 30% albedo -- 8.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 78799, (2017/11/22 20:49UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:24.5 +27:58:54  1.1 22.53 170
Alnath         05:27:25.5 +28:37:15  1.6  9.34 153
PPM 071196     06:06:44.9 +33:35:47  6.1  0.47 159
PPM 071191     06:06:35.0 +33:43:52  8.5  0.47 159
PPM 071167     06:05:15.8 +33:44:25  9.8  0.24 158
PPM 071163     06:05:11.5 +33:33:23 11.0  0.15 158
78799          06:04:28.7 +33:34:12 15.0       158
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 78799, (2017/11/22 20:49UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.1 +28:01:33  1.1 22.53 170
Alnath         05:26:17.5 +28:36:24  1.6  9.34 153
PPM 071196     06:05:34.0 +33:35:57  6.1  0.47 159
PPM 071191     06:05:24.0 +33:44:02  8.5  0.47 159
PPM 071167     06:04:04.8 +33:44:33  9.8  0.24 158
PPM 071163     06:04:00.6 +33:33:31 11.0  0.15 158
78799          06:03:17.8 +33:34:18 15.0       158
Positions are for J2000

Event circumstances last updated at 2017/07/27 16:03:41 UT

Marc W. Buie, Southwest Research Institute

RECON