RECON: TNO occultation with 600217

Event between (600217) 11QY100 and star GA0900:03282513 with event index number of 2731285

Geocentric closest approach at 2028/04/11 21:30:17 UTC

J2000 position of star is 07:57:54.8 +00:50:27
Equinox of date position of star is 07:59:03.1 +00:46:48
Stellar brightness G=13.6, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 111 degrees from the moon. Moon is 92% illuminated.
TNO apparent brightness V=21.8

TNO is 21.8 AU from the Sun and 21.6 AU from the Earth.
The TNO is moving 12.5 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 141 seconds.
The 1-sigma cross-track error in the shadow position is 2586 km.

The TNO has an absolute magnitude Hv=8.2
Diameter=137.4 km assuming a 5% albedo -- 11.0 sec chord
Diameter=56.1 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 600217, (2028/04/11 21:30UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:46:23.8 -16:45:17 -1.5 25.11 117
Alphard        09:28:58.6 -08:46:57  2.0 24.28  87
13Zet CMi      07:53:09.9 +01:41:34  5.1  1.81 113
PPM 153624     07:58:43.6 +01:02:58  6.8  0.33 111
PPM 153657     08:00:04.4 +00:45:30  9.9  0.18 111
PPM 153646     07:59:44.7 +00:51:25 10.3  0.13 111
600217         07:59:22.2 +00:45:46 13.6       111
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 600217, (2028/04/11 21:30UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:45:08.0 -16:43:25 -1.5 25.11 117
Alphard        09:27:35.2 -08:39:30  2.0 24.28  87
13Zet CMi      07:51:42.0 +01:46:01  5.1  1.81 113
PPM 153624     07:57:16.0 +01:07:37  6.8  0.33 111
PPM 153657     07:58:37.0 +00:50:12  9.9  0.18 111
PPM 153646     07:58:17.2 +00:56:07 10.3  0.13 111
600217         07:57:54.8 +00:50:27 13.6       111
Positions are for J2000

Event circumstances last updated at 2022/02/10 00:35:25 UT

Marc W. Buie, Southwest Research Institute

RECON