RECON: TNO occultation with 05EX318

Event between 05EX318 and star GA0860:04240257 with event index number of 266052

Geocentric closest approach at 2020/05/25 17:15:01 UTC

J2000 position of star is 13:43:05.9 -03:40:16
Equinox of date position of star is 13:44:08.7 -03:46:20
Stellar brightness G=16.9, use SENSEUP=128
Star is 105 degrees from the moon. Moon is 9% illuminated.
TNO apparent brightness V=25.6

TNO is 36.0 AU from the Sun and 35.2 AU from the Earth.
The TNO is moving 18.0 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 147 seconds.
The 1-sigma cross-track error in the shadow position is 1616 km.

The TNO has an absolute magnitude Hv=10.0
Diameter=239.9 km assuming a 5% albedo -- 3.4 sec chord
Diameter=97.9 km assuming a 30% albedo -- 1.4 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 05EX318, (2020/05/25 17:15UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:16.2 -11:16:02  1.0  8.71 104
80 Vir         13:36:35.1 -05:29:58  5.7  2.56 104
PPM 196834     13:45:48.6 -03:38:07  8.4  0.44 106
PPM 196809     13:44:42.9 -03:37:38  8.8  0.20 105
PPM 196802     13:44:21.5 -03:50:04 10.1  0.08 105
05EX318        13:44:09.4 -03:46:24 16.9       106
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 05EX318, (2020/05/25 17:15UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0  8.71 104
80 Vir         13:35:31.3 -05:23:45  5.7  2.56 104
PPM 196834     13:44:45.1 -03:32:01  8.4  0.44 106
PPM 196809     13:43:39.4 -03:31:31  8.8  0.20 105
PPM 196802     13:43:17.9 -03:43:57 10.1  0.08 105
05EX318        13:43:05.9 -03:40:16 16.9       105
Positions are for J2000

Event circumstances last updated at 2020/03/09 21:05:24 UT

Marc W. Buie, Southwest Research Institute

RECON