RECON: TNO occultation with 471931

Event between (471931) 13PH44 and star GA0760:00155196 with event index number of 2456866

Geocentric closest approach at 2022/09/17 00:28:01 UTC

J2000 position of star is 01:58:09.6 -13:44:44
Equinox of date position of star is 01:59:13.5 -13:38:23
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 57 degrees from the moon. Moon is 59% illuminated.
TNO apparent brightness V=21.7

TNO is 16.4 AU from the Sun and 15.6 AU from the Earth.
The TNO is moving 21.1 km/sec on the sky relative to the star, or, 6.7 arcsec/hr.
The 1-sigma error in the time of the event is 34 seconds.
The 1-sigma cross-track error in the shadow position is 747 km.

The TNO has an absolute magnitude Hv=9.4
Diameter=80.2 km assuming a 5% albedo -- 3.8 sec chord
Diameter=32.7 km assuming a 30% albedo -- 1.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 471931, (2022/09/17 00:28UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:54.0 -29:30:05  1.2 44.50 101
68Omi Cet      02:20:29.7 -02:52:32  2.0 11.97  46
PPM 210746     01:52:52.0 -15:32:10  6.3  2.45  60
PPM 210922     02:00:37.2 -13:45:47  7.0  0.35  57
PPM 210891     01:59:09.7 -13:36:58  9.8  0.03  57
471931         01:59:15.7 -13:38:09 16.3        57
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 471931, (2022/09/17 00:28UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 44.50 101
68Omi Cet      02:19:20.8 -02:58:45  2.0 11.97  46
PPM 210746     01:51:46.1 -15:38:51  6.3  2.45  60
PPM 210922     01:59:31.1 -13:52:21  7.0  0.35  57
PPM 210891     01:58:03.5 -13:43:33  9.8  0.03  57
471931         01:58:09.6 -13:44:44 16.3        57
Positions are for J2000

Event circumstances last updated at 2021/12/08 01:50:20 UT

Marc W. Buie, Southwest Research Institute

RECON