RECON: TNO occultation with 06QJ181

Event between 06QJ181 and star GA1040:01417492 with event index number of 1054449

Geocentric closest approach at 2021/02/08 18:52:44 UTC

J2000 position of star is 06:01:01.5 +15:32:37
Equinox of date position of star is 06:02:14.0 +15:32:34
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 164 degrees from the moon. Moon is 10% illuminated.
TNO apparent brightness V=22.1

TNO is 32.0 AU from the Sun and 31.4 AU from the Earth.
The TNO is moving 13.8 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 395 seconds.
The 1-sigma cross-track error in the shadow position is 2362 km.

The TNO has an absolute magnitude Hv=6.9
Diameter=245.5 km assuming a 5% albedo -- 17.8 sec chord
Diameter=100.2 km assuming a 30% albedo -- 7.3 sec chord
Dynamical classification is 3:1EE+3:1II
 
 
 
 
 
 
 
 

Star training set for 06QJ181, (2021/02/08 18:53UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:18.9 +07:24:33  0.4  8.26 157
Alhena         06:38:55.9 +16:22:46  1.9  8.86 170
137 Tau        05:53:34.3 +14:10:31  5.5  2.50 162
PPM 121788     06:03:15.4 +15:12:18  8.2  0.42 164
PPM 121724     06:01:10.8 +15:36:36  9.4  0.26 164
PPM 121785     06:03:07.0 +15:37:43 10.1  0.23 164
06QJ181        06:02:14.2 +15:32:34 16.0       164
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 06QJ181, (2021/02/08 18:53UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  8.26 157
Alhena         06:37:42.8 +16:23:57  1.9  8.86 170
137 Tau        05:52:22.2 +14:10:18  5.5  2.50 162
PPM 121788     06:02:02.8 +15:12:23  8.2  0.42 164
PPM 121724     05:59:58.0 +15:36:37  9.4  0.26 164
PPM 121785     06:01:54.2 +15:37:47 10.1  0.23 164
06QJ181        06:01:01.5 +15:32:37 16.0       164
Positions are for J2000

Event circumstances last updated at 2021/01/18 21:23:32 UT

Marc W. Buie, Southwest Research Institute

RECON