RECON: TNO occultation with 98WW31

Event between 98WW31 and star GA1100:00930230 with event index number of 1238588

Geocentric closest approach at 2022/12/17 16:18:49 UTC

J2000 position of star is 05:10:53.3 +20:23:26
Equinox of date position of star is 05:12:14.3 +20:25:02
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 112 degrees from the moon. Moon is 37% illuminated.
TNO apparent brightness V=23.2

TNO is 47.9 AU from the Sun and 46.9 AU from the Earth.
The TNO is moving 25.9 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 329 seconds.
The 1-sigma cross-track error in the shadow position is 1872 km.

The TNO has an absolute magnitude Hv=6.4
Diameter=322.1 km assuming a 5% albedo -- 12.4 sec chord
Diameter=131.5 km assuming a 30% albedo -- 5.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 98WW31, (2022/12/17 16:19UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:14.4 +16:33:13  0.8  9.15 121
Alnath         05:27:44.7 +28:37:29  1.6  8.93 108
104 Tau        05:08:48.5 +18:40:27  5.6  1.92 113
PPM 094144     05:12:09.4 +20:35:45  8.2  0.18 112
98WW31         05:12:15.1 +20:25:03 15.6       112
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 98WW31, (2022/12/17 16:19UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  9.15 121
Alnath         05:26:17.5 +28:36:23  1.6  8.93 108
104 Tau        05:07:27.8 +18:38:43  5.6  1.92 113
PPM 094144     05:10:47.6 +20:34:09  8.2  0.18 112
98WW31         05:10:53.3 +20:23:26 15.6       112
Positions are for J2000

Event circumstances last updated at 2022/10/03 04:14:15 UT

Marc W. Buie, Southwest Research Institute

RECON