RECON: TNO occultation with 07LG38

Event between 07LG38 and star GA0900:07228651 with event index number of 1122936

Geocentric closest approach at 2021/06/12 21:29:35 UTC

J2000 position of star is 18:15:38.0 +01:52:21
Equinox of date position of star is 18:16:42.6 +01:52:51
Stellar brightness G=15.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 148 degrees from the moon. Moon is 6% illuminated.
TNO apparent brightness V=23.9

TNO is 35.8 AU from the Sun and 34.9 AU from the Earth.
The TNO is moving 23.4 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 170 seconds.
The 1-sigma cross-track error in the shadow position is 1913 km.

The TNO has an absolute magnitude Hv=8.3
Diameter=132.4 km assuming a 5% albedo -- 5.7 sec chord
Diameter=54.1 km assuming a 30% albedo -- 2.3 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 
 
 

Star training set for 07LG38, (2021/06/12 21:30UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.6 -26:28:40  0.9 38.19 141
60Bet Oph      17:44:32.0 +04:33:36  2.8  8.47 141
PPM 165298     18:10:58.4 +03:07:27  6.1  1.90 146
PPM 165504     18:17:10.3 +02:23:10  7.5  0.52 148
PPM 165464     18:15:50.6 +01:46:01  8.8  0.25 148
07LG38         18:16:43.0 +01:52:51 15.2       148
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 07LG38, (2021/06/12 21:30UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 38.19 141
60Bet Oph      17:43:28.3 +04:34:06  2.8  8.47 141
PPM 165298     18:09:54.1 +03:07:07  6.1  1.90 146
PPM 165504     18:16:05.6 +02:22:39  7.5  0.52 148
PPM 165464     18:14:45.5 +01:45:33  8.8  0.25 148
07LG38         18:15:38.0 +01:52:21 15.2       148
Positions are for J2000

Event circumstances last updated at 2021/04/19 23:03:42 UT

Marc W. Buie, Southwest Research Institute

RECON