RECON: TNO occultation with 90568

Event between (90568) 04GV9 and star UC4-321-077121 with event index number of 181763

Geocentric closest approach at 2019/02/08 10:34:26 UTC

J2000 position of star is 15:07:52.1 -25:53:14
Equinox of date position of star is 15:08:53.1 -25:57:09
Stellar brightness R=14.9, use SENSEUP=128
Star is 125 degrees from the moon. Moon is 11% illuminated.
TNO apparent brightness V=20.1

TNO is 39.6 AU from the Sun and 39.6 AU from the Earth.
The TNO is moving 6.7 km/sec on the sky relative to the star, or, 0.8 arcsec/hr.
The 1-sigma error in the time of the event is 497 seconds.
The 1-sigma cross-track error in the shadow position is 3640 km.

The TNO has an absolute magnitude Hv=4.0
Diameter=955.0 km assuming a 5% albedo -- 143.2 sec chord
Diameter=389.9 km assuming a 30% albedo -- 58.5 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 90568, (2019/02/08 10:34UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:34.9 -26:28:22  0.9 18.29 108
7Del Sco       16:01:28.0 -22:40:29  2.3 12.39 115
20Sig Lib      15:05:11.6 -25:21:21  3.3  1.05 126
PPM 263798     15:07:29.4 -26:10:50  8.0  0.40 125
PPM 263836     15:08:55.2 -25:50:30  9.5  0.12 125
90568          15:08:59.9 -25:57:35 14.9       125
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 90568, (2019/02/08 10:34UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:55  0.9 18.29 108
7Del Sco       16:00:20.0 -22:37:18  2.3 12.39 115
20Sig Lib      15:04:04.1 -25:16:56  3.3  1.05 126
PPM 263798     15:06:21.6 -26:06:27  8.0  0.40 125
PPM 263836     15:07:47.4 -25:46:10  9.5  0.12 125
90568          15:07:52.1 -25:53:14 14.9       125
Positions are for J2000

Event circumstances last updated at 2017/03/05 17:42:47 UT

Marc W. Buie, Southwest Research Institute

RECON