RECON: TNO occultation with 12DR30

Event between 12DR30 and star GA0100:00386763 with event index number of 2143819

Geocentric closest approach at 2022/02/19 21:45:50 UTC

J2000 position of star is 07:02:29.7 -78:13:09
Equinox of date position of star is 07:01:21.4 -78:15:06
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 88 degrees from the moon. Moon is 89% illuminated.
TNO apparent brightness V=20.9

TNO is 22.4 AU from the Sun and 22.5 AU from the Earth.
The TNO is moving 31.6 km/sec on the sky relative to the star, or, 7.0 arcsec/hr.
The 1-sigma error in the time of the event is 41 seconds.
The 1-sigma cross-track error in the shadow position is 1821 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=227.0 km assuming a 5% albedo -- 7.2 sec chord
Diameter=92.7 km assuming a 30% albedo -- 2.9 sec chord
Dynamical classification is CENTAURS
 
 
 
 
 
 
 
 

Star training set for 12DR30, (2022/02/19 21:46UT)
Object            RA         Dec     mag  sep  mel
Canopus        06:24:26.6 -52:42:31 -0.7 25.75  92
Bet Car        09:13:26.0 -69:48:31  1.7 12.09  77
The Men        06:55:08.6 -79:27:00  5.4  1.23  89
PPM 369394     07:02:25.9 -77:58:35  8.3  0.28  88
PPM 369403     07:03:56.4 -78:06:27  9.2  0.20  88
12DR30         07:01:20.9 -78:15:07 16.9        88
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 12DR30, (2022/02/19 21:46UT)
Object            RA         Dec     mag  sep  mel
Canopus        06:23:57.2 -52:41:44 -0.7 25.75  92
Bet Car        09:13:11.3 -69:43:00  1.7 12.09  77
The Men        06:56:34.4 -79:25:13  5.4  1.23  89
PPM 369394     07:03:31.3 -77:56:35  8.3  0.28  88
PPM 369403     07:05:03.1 -78:04:24  9.2  0.20  88
12DR30         07:02:29.7 -78:13:09 16.9        88
Positions are for J2000

Event circumstances last updated at 2021/12/18 01:46:19 UT

Marc W. Buie, Southwest Research Institute

RECON