RECON: TNO occultation with 550310

Event between (550310) 12DD86 and star GA0800:04753979 with event index number of 2399887

Geocentric closest approach at 2023/01/25 09:19:32 UTC

J2000 position of star is 15:23:22.0 -08:21:40
Equinox of date position of star is 15:24:33.7 -08:26:20
Stellar brightness G=14.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 124 degrees from the moon. Moon is 17% illuminated.
TNO apparent brightness V=22.2

TNO is 17.3 AU from the Sun and 17.6 AU from the Earth.
The TNO is moving 17.1 km/sec on the sky relative to the star, or, 4.8 arcsec/hr.
The 1-sigma error in the time of the event is 78 seconds.
The 1-sigma cross-track error in the shadow position is 693 km.

The TNO has an absolute magnitude Hv=9.5
Diameter=74.5 km assuming a 5% albedo -- 4.4 sec chord
Diameter=30.4 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 550310, (2023/01/25 09:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:49.5 -26:28:52  0.9 23.92 104
27Bet Lib      15:18:15.1 -09:28:00  2.6  1.87 125
31Eps Lib      15:25:27.1 -10:24:13  4.8  1.97 123
PPM 198502     15:22:54.6 -08:44:17  8.5  0.51 124
PPM 198531     15:24:10.0 -08:30:39  8.7  0.13 124
550310         15:24:36.5 -08:26:31 14.5       123
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 550310, (2023/01/25 09:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 23.92 104
27Bet Lib      15:17:00.3 -09:22:59  2.6  1.87 125
31Eps Lib      15:24:11.8 -10:19:23  4.8  1.97 123
PPM 198502     15:21:40.0 -08:39:24  8.5  0.51 124
PPM 198531     15:22:55.5 -08:25:48  8.7  0.13 124
550310         15:23:22.0 -08:21:40 14.5       124
Positions are for J2000

Event circumstances last updated at 2022/03/12 01:52:01 UT

Marc W. Buie, Southwest Research Institute

RECON