RECON: TNO occultation with 456826

Event between (456826) 07TH422 and star UC4-523-011924 with event index number of 104262

Geocentric closest approach at 2018/02/03 11:27:26 UTC

J2000 position of star is 05:14:47.7 +14:24:26
Equinox of date position of star is 05:15:43.1 +14:25:29
Stellar brightness R=15.0
Star is 96 degrees from the moon. Moon is 89% illuminated.
TNO apparent brightness V=22.4

TNO is 29.3 AU from the Sun and 28.7 AU from the Earth.
The TNO is moving 13.6 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 186 seconds.
The 1-sigma cross-track error in the shadow position is 2113 km.

The TNO has an absolute magnitude Hv=7.6
Diameter=182.0 km assuming a 5% albedo -- 13.4 sec chord
Diameter=74.3 km assuming a 30% albedo -- 5.5 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 456826, (2018/02/03 11:27UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:57.6 +16:32:40  0.8  9.60 104
Bellatrix      05:26:06.1 +06:21:53  1.6  8.45  94
15 Ori         05:10:44.2 +15:37:07  5.2  1.71  97
PPM 120759     05:16:11.1 +15:04:54  7.2  0.66  95
PPM 120746     05:15:36.4 +14:08:32  9.2  0.29  96
PPM 120743     05:15:26.5 +14:30:11 10.3  0.12  96
456826         05:15:49.4 +14:25:36 15.0        95
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.

Event circumstances last updated at 2016/03/22 17:04:58 UT

Marc W. Buie, Southwest Research Institute

RECON