RECON: TNO occultation with 118378

Event between (118378) 99HT11 and star GA0720:05735334 with event index number of 1094864

Geocentric closest approach at 2022/04/09 02:05:11 UTC

J2000 position of star is 15:52:31.1 -17:38:39
Equinox of date position of star is 15:53:47.4 -17:42:32
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 132 degrees from the moon. Moon is 48% illuminated.
TNO apparent brightness V=23.6

TNO is 39.6 AU from the Sun and 38.9 AU from the Earth.
The TNO is moving 17.3 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 391 seconds.
The 1-sigma cross-track error in the shadow position is 2444 km.

The TNO has an absolute magnitude Hv=7.6
Diameter=182.0 km assuming a 5% albedo -- 10.5 sec chord
Diameter=74.3 km assuming a 30% albedo -- 4.3 sec chord
Dynamical classification is 7:4EEE
 
 
 
 
 
 
 
 

Star training set for 118378, (2022/04/09 02:05UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:46.6 -26:28:46  0.9 12.25 143
8Bet1Sco       16:06:44.1 -19:51:53  2.6  3.75 136
46The Lib      15:55:05.8 -16:47:35  4.3  0.97 132
PPM 230840     15:52:13.4 -18:06:43  8.5  0.55 132
PPM 230873     15:53:36.9 -17:28:18  9.4  0.24 132
118378         15:53:47.7 -17:42:33 16.7       133
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 118378, (2022/04/09 02:05UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 12.25 143
8Bet1Sco       16:05:26.2 -19:48:20  2.6  3.75 136
46The Lib      15:53:49.7 -16:43:43  4.3  0.97 132
PPM 230840     15:50:56.7 -18:02:46  8.5  0.55 132
PPM 230873     15:52:20.4 -17:24:23  9.4  0.24 132
118378         15:52:31.1 -17:38:39 16.7       132
Positions are for J2000

Event circumstances last updated at 2022/03/14 01:01:11 UT

Marc W. Buie, Southwest Research Institute

RECON