RECON: TNO occultation with 05VA123

Event between 05VA123 and star GA1140:01897730 with event index number of 1987809

Geocentric closest approach at 2021/12/08 00:14:17 UTC

J2000 position of star is 06:08:15.9 +24:38:43
Equinox of date position of star is 06:09:36.7 +24:38:26
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 144 degrees from the moon. Moon is 19% illuminated.
TNO apparent brightness V=22.9

TNO is 37.7 AU from the Sun and 36.8 AU from the Earth.
The TNO is moving 24.3 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 208 seconds.
The 1-sigma cross-track error in the shadow position is 1334 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=226.0 km assuming a 5% albedo -- 9.3 sec chord
Diameter=92.2 km assuming a 30% albedo -- 3.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 05VA123, (2021/12/08 00:14UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:21.6 +07:24:34  0.4 17.52 136
Alnath         05:27:40.8 +28:37:26  1.6 10.18 135
3 Gem          06:11:04.0 +23:06:28  5.5  1.57 144
5 Gem          06:12:53.0 +24:24:48  6.7  0.78 145
PPM 095411     06:08:18.0 +24:32:31  9.6  0.31 144
PPM 095459     06:09:37.2 +24:34:54 10.4  0.06 144
05VA123        06:09:36.7 +24:38:26 15.6       145
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 05VA123, (2021/12/08 00:14UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 17.52 136
Alnath         05:26:17.6 +28:36:23  1.6 10.18 135
3 Gem          06:09:44.0 +23:06:48  5.5  1.57 144
5 Gem          06:11:32.3 +24:25:12  6.7  0.78 145
PPM 095411     06:06:57.2 +24:32:45  9.6  0.31 144
PPM 095459     06:08:16.3 +24:35:11 10.4  0.06 144
05VA123        06:08:15.9 +24:38:43 15.6       144
Positions are for J2000

Event circumstances last updated at 2021/12/03 01:42:22 UT

Marc W. Buie, Southwest Research Institute

RECON