RECON: TNO occultation with 12GU11

Event between 12GU11 and star UC4-446-057104 with event index number of 162583

Geocentric closest approach at 2017/04/18 18:37:54 UTC

J2000 position of star is 13:51:36.7 -00:52:37
Equinox of date position of star is 13:52:29.0 -00:57:37
Stellar brightness R=16.0
Star is 85 degrees from the moon. Moon is 56% illuminated.
TNO apparent brightness V=22.5

TNO is 22.9 AU from the Sun and 22.0 AU from the Earth.
The TNO is moving 22.0 km/sec on the sky relative to the star, or, 5.0 arcsec/hr.
The 1-sigma error in the time of the event is 237 seconds.
The 1-sigma cross-track error in the shadow position is 2281 km.

The TNO has an absolute magnitude Hv=8.9
Diameter=100.5 km assuming a 5% albedo -- 4.6 sec chord
Diameter=41.0 km assuming a 30% albedo -- 1.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 12GU11, (2017/04/18 18:38UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:06.4 -11:15:04  1.0 12.20  88
90 Vir         13:55:35.5 -01:35:15  5.1  0.99  84
PPM 179176     13:55:00.8 -02:03:01  8.5  1.26  84
PPM 179175     13:54:59.9 -01:02:27  9.9  0.63  84
PPM 179164     13:52:08.3 -01:02:55 10.9  0.13  85
12GU11         13:52:30.1 -00:57:43 16.0        85
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 12GU11, (2017/04/18 18:38UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 12.20  88
90 Vir         13:54:42.0 -01:30:12  5.1  0.99  84
PPM 179176     13:54:07.2 -01:57:57  8.5  1.26  84
PPM 179175     13:54:06.5 -00:57:22  9.9  0.63  84
PPM 179164     13:51:14.9 -00:57:49 10.9  0.13  85
12GU11         13:51:36.7 -00:52:37 16.0        85
Positions are for J2000

Event circumstances last updated at 2016/12/09 18:47:23 UT

Marc W. Buie, Southwest Research Institute

RECON