RECON: TNO occultation with 12HE85

Event between 12HE85 and star UC4-349-164829 with event index number of 120437

Geocentric closest approach at 2017/08/05 23:25:41 UTC

J2000 position of star is 19:02:31.0 -20:16:17
Equinox of date position of star is 19:03:31.1 -20:14:45
Stellar brightness R=16.3
Star is 9 degrees from the moon. Moon is 97% illuminated.
TNO apparent brightness V=26.1

TNO is 40.1 AU from the Sun and 39.2 AU from the Earth.
The TNO is moving 20.7 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 1343 seconds.
The 1-sigma cross-track error in the shadow position is 2154 km.

The TNO has an absolute magnitude Hv=10.1
Diameter=58.9 km assuming a 5% albedo -- 2.9 sec chord
Diameter=24.0 km assuming a 30% albedo -- 1.2 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 12HE85, (2017/08/05 23:26UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:29.3 -26:28:11  0.9 35.55  44
Nunki          18:56:21.3 -26:16:24  2.0  6.25  13
PPM 235418     19:04:05.9 -19:13:08  5.9  1.03   9
PPM 269246     19:04:35.5 -20:06:06  8.2  0.28   9
PPM 269222     19:03:06.4 -20:19:57  9.2  0.14   9
12HE85         19:03:33.4 -20:14:41 16.3         9
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 12HE85, (2017/08/05 23:26UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:55  0.9 35.55  44
Nunki          18:55:15.9 -26:17:49  2.0  6.25  13
PPM 235418     19:03:04.0 -19:14:44  5.9  1.03   9
PPM 269246     19:03:33.1 -20:07:43  8.2  0.28   9
PPM 269222     19:02:03.9 -20:21:32  9.2  0.14   9
12HE85         19:02:31.0 -20:16:17 16.3         9
Positions are for J2000

Event circumstances last updated at 2016/12/09 18:52:14 UT

Marc W. Buie, Southwest Research Institute

RECON