RECON: TNO occultation with 432949

Event between (432949) 12HH2 and star GA0860:04341549 with event index number of 2437713

Geocentric closest approach at 2022/05/29 22:06:24 UTC

J2000 position of star is 14:25:41.5 -02:45:29
Equinox of date position of star is 14:26:51.0 -02:51:29
Stellar brightness G=15.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 150 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=21.4

TNO is 31.1 AU from the Sun and 30.3 AU from the Earth.
The TNO is moving 20.5 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 59 seconds.
The 1-sigma cross-track error in the shadow position is 1222 km.

The TNO has an absolute magnitude Hv=6.4
Diameter=322.1 km assuming a 5% albedo -- 15.7 sec chord
Diameter=131.5 km assuming a 30% albedo -- 6.4 sec chord
Dynamical classification is 5:4E+10:8II
 
 
 
 
 
 
 
 

Star training set for 432949, (2022/05/29 22:06UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:22.6 -11:16:39  1.0 17.19 141
27Bet Lib      15:18:13.0 -09:27:51  2.6 14.37 164
105Phi Vir     14:29:21.6 -02:19:38  4.8  0.82 150
PPM 179296     14:25:45.5 -02:26:36  8.4  0.50 150
PPM 197525     14:26:07.4 -03:07:30  9.3  0.32 150
PPM 179300     14:26:54.1 -03:06:13 10.4  0.25 150
432949         14:26:51.3 -02:51:30 15.2       151
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 432949, (2022/05/29 22:06UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 17.19 141
27Bet Lib      15:17:00.3 -09:22:59  2.6 14.37 164
105Phi Vir     14:28:11.9 -02:13:41  4.8  0.82 150
PPM 179296     14:24:35.8 -02:20:34  8.4  0.50 150
PPM 197525     14:24:57.5 -03:01:28  9.3  0.32 150
PPM 179300     14:25:44.2 -03:00:12 10.4  0.25 150
432949         14:25:41.5 -02:45:29 15.2       150
Positions are for J2000

Event circumstances last updated at 2022/05/03 00:32:06 UT

Marc W. Buie, Southwest Research Institute

RECON