RECON: TNO occultation with 523746

Event between (523746) 14UT114 and star GA1240:02218961 with event index number of 2322721

Geocentric closest approach at 2022/04/10 00:42:03 UTC

J2000 position of star is 05:47:41.3 +34:42:47
Equinox of date position of star is 05:49:10.1 +34:43:10
Stellar brightness G=15.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 31 degrees from the moon. Moon is 57% illuminated.
TNO apparent brightness V=21.4

TNO is 16.0 AU from the Sun and 16.3 AU from the Earth.
The TNO is moving 21.0 km/sec on the sky relative to the star, or, 6.4 arcsec/hr.
The 1-sigma error in the time of the event is 166 seconds.
The 1-sigma cross-track error in the shadow position is 1291 km.

The TNO has an absolute magnitude Hv=9.0
Diameter=95.5 km assuming a 5% albedo -- 4.6 sec chord
Diameter=39.0 km assuming a 30% albedo -- 1.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 523746, (2022/04/10 00:42UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:12.1 +16:33:08  0.8 24.27  50
Alnath         05:27:42.1 +28:37:27  1.6  7.61  36
31Ups Aur      05:52:33.7 +37:18:35  6.3  2.68  31
PPM 070834     05:48:29.3 +34:19:06  7.4  0.43  31
PPM 070832     05:48:27.8 +34:34:00 10.0  0.21  31
523746         05:49:10.4 +34:43:10 15.2        31
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 523746, (2022/04/10 00:42UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 24.27  50
Alnath         05:26:17.6 +28:36:23  1.6  7.61  36
31Ups Aur      05:51:02.5 +37:18:19  6.3  2.68  31
PPM 070834     05:47:00.5 +34:18:42  7.4  0.43  31
PPM 070832     05:46:58.8 +34:33:36 10.0  0.21  31
523746         05:47:41.3 +34:42:47 15.2        31
Positions are for J2000

Event circumstances last updated at 2022/03/15 01:00:23 UT

Marc W. Buie, Southwest Research Institute

RECON