RECON: TNO occultation with 612688

Event between (612688) 03UT292 and star GA0960:01918691 with event index number of 2816627

Geocentric closest approach at 2022/12/18 18:32:59 UTC

J2000 position of star is 06:32:18.8 +06:24:28
Equinox of date position of star is 06:33:30.8 +06:23:24
Stellar brightness G=15.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 106 degrees from the moon. Moon is 26% illuminated.
TNO apparent brightness V=21.5

TNO is 27.8 AU from the Sun and 26.8 AU from the Earth.
The TNO is moving 23.4 km/sec on the sky relative to the star, or, 4.3 arcsec/hr.
The 1-sigma error in the time of the event is 158 seconds.
The 1-sigma cross-track error in the shadow position is 1160 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=231.2 km assuming a 5% albedo -- 9.9 sec chord
Diameter=94.4 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 612688, (2022/12/18 18:33UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:24.9 +07:24:34  0.4  9.27 116
Alhena         06:39:02.3 +16:22:40  1.9 10.08 106
13 Mon         06:34:08.7 +07:18:51  4.5  0.94 106
PPM 150701     06:33:21.0 +06:01:02  6.8  0.38 106
PPM 150681     06:32:50.6 +06:27:48  9.6  0.19 107
612688         06:33:32.8 +06:23:23 15.8       106
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 612688, (2022/12/18 18:33UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  9.27 116
Alhena         06:37:42.8 +16:23:56  1.9 10.08 106
13 Mon         06:32:54.2 +07:19:58  4.5  0.94 106
PPM 150701     06:32:07.2 +06:02:08  6.8  0.38 106
PPM 150681     06:31:36.5 +06:28:53  9.6  0.19 107
612688         06:32:18.8 +06:24:28 15.8       106
Positions are for J2000

Event circumstances last updated at 2022/05/03 00:49:36 UT

Marc W. Buie, Southwest Research Institute

RECON