RECON: TNO occultation with 32532

Event between (32532) Thereus and star GA0840:03794541 with event index number of 1061382

Geocentric closest approach at 2021/03/08 18:35:03 UTC

J2000 position of star is 09:28:21.6 -04:51:46
Equinox of date position of star is 09:29:25.2 -04:57:21
Stellar brightness G=17.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 141 degrees from the moon. Moon is 22% illuminated.
TNO apparent brightness V=19.9

TNO is 12.2 AU from the Sun and 11.3 AU from the Earth.
The TNO is moving 20.9 km/sec on the sky relative to the star, or, 9.2 arcsec/hr.
The 1-sigma error in the time of the event is 26 seconds.
The 1-sigma cross-track error in the shadow position is 476 km.

The TNO has an absolute magnitude Hv=9.0
Diameter=94.6 km assuming a 5% albedo -- 4.5 sec chord
Diameter=38.6 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 32532, (2021/03/08 18:35UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:29.9 +11:51:46  1.3 19.55 143
Alphard        09:28:37.7 -08:45:05  2.0  3.80 138
PPM 192436     09:30:36.2 -04:20:26  6.3  0.68 141
PPM 192371     09:27:27.1 -04:48:41  8.4  0.51 141
PPM 192418     09:29:57.2 -05:08:38  9.0  0.23 140
32532          09:29:25.2 -04:57:21 17.0       140
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 32532, (2021/03/08 18:35UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 19.55 143
Alphard        09:27:35.2 -08:39:30  2.0  3.80 138
PPM 192436     09:29:32.4 -04:14:49  6.3  0.68 141
PPM 192371     09:26:23.5 -04:43:08  8.4  0.51 141
PPM 192418     09:28:53.6 -05:03:02  9.0  0.23 140
32532          09:28:21.6 -04:51:46 17.0       141
Positions are for J2000

Event circumstances last updated at 2021/03/05 00:19:27 UT

Marc W. Buie, Southwest Research Institute

RECON