RECON: TNO occultation with 38628

Event between (38628) Huya and star UC4-420-066854 with event index number of 191678

Geocentric closest approach at 2019/05/20 12:10:25 UTC

J2000 position of star is 16:36:56.8 -06:10:19
Equinox of date position of star is 16:37:53.2 -06:12:23
Stellar brightness R=14.3, use SENSEUP=64
Star is 17 degrees from the moon. Moon is 97% illuminated.
TNO apparent brightness V=19.4

TNO is 28.7 AU from the Sun and 27.7 AU from the Earth.
The TNO is moving 22.7 km/sec on the sky relative to the star, or, 4.1 arcsec/hr.
The 1-sigma error in the time of the event is 71 seconds.
The 1-sigma cross-track error in the shadow position is 1111 km.

The TNO has an absolute magnitude Hv=4.8
Diameter=660.7 km assuming a 5% albedo -- 29.1 sec chord
Diameter=269.7 km assuming a 30% albedo -- 11.9 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 
 
 

Star training set for 38628, (2019/05/20 12:10UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:35.9 -26:28:24  0.9 20.34  12
13Zet Oph      16:38:13.7 -10:36:18  2.6  4.40  13
PPM 199844     16:39:04.0 -06:34:33  6.4  0.45  17
PPM 199825     16:37:50.8 -06:19:57  8.3  0.13  17
38628          16:37:59.0 -06:12:36 14.3        17
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 38628, (2019/05/20 12:10UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 20.34  12
13Zet Oph      16:37:09.6 -10:34:01  2.6  4.40  13
PPM 199844     16:38:01.6 -06:32:17  6.4  0.45  17
PPM 199825     16:36:48.5 -06:17:40  8.3  0.13  17
38628          16:36:56.8 -06:10:19 14.3        17
Positions are for J2000

Event circumstances last updated at 2017/08/04 18:06:32 UT

Marc W. Buie, Southwest Research Institute

RECON