RECON: TNO occultation with 432949

Event between (432949) 12HH2 and star GA0860:04360469 with event index number of 2437707

Geocentric closest approach at 2022/01/03 06:49:43 UTC

J2000 position of star is 14:32:48.8 -03:24:59
Equinox of date position of star is 14:33:56.8 -03:30:41
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 74 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=21.5

TNO is 31.1 AU from the Sun and 31.5 AU from the Earth.
The TNO is moving 17.7 km/sec on the sky relative to the star, or, 2.8 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 1394 km.

The TNO has an absolute magnitude Hv=6.4
Diameter=319.2 km assuming a 5% albedo -- 18.1 sec chord
Diameter=130.3 km assuming a 30% albedo -- 7.4 sec chord
Dynamical classification is 5:4E+10:8II
 
 
 
 
 
 
 
 

Star training set for 432949, (2022/01/03 06:50UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:21.3 -11:16:32  1.0 18.46  86
27Bet Lib      15:18:11.7 -09:27:46  2.6 12.49  62
105Phi Vir     14:29:20.3 -02:19:32  4.8  1.66  76
PPM 197621     14:31:51.1 -03:12:23  7.8  0.61  75
PPM 197667     14:34:30.2 -03:23:45  9.5  0.18  74
432949         14:33:57.6 -03:30:45 15.1        74
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, (2022/01/03 06:50UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 18.46  86
27Bet Lib      15:17:00.3 -09:22:59  2.6 12.49  62
105Phi Vir     14:28:11.9 -02:13:41  4.8  1.66  76
PPM 197621     14:30:42.4 -03:06:35  7.8  0.61  75
PPM 197667     14:33:21.5 -03:18:00  9.5  0.18  74
432949         14:32:48.8 -03:24:59 15.1        74
Positions are for J2000

Event circumstances last updated at 2021/10/10 01:01:58 UT

Marc W. Buie, Southwest Research Institute

RECON