RECON: TNO occultation with 29981

Event between (29981) 99TD10 and star UC4-534-035572 with event index number of 171168

Geocentric closest approach at 2019/01/01 19:17:59 UTC

J2000 position of star is 06:55:54.3 +16:41:59
Equinox of date position of star is 06:56:54.5 +16:40:35
Stellar brightness R=13.6, use SENSEUP=64
Star is 130 degrees from the moon. Moon is 17% illuminated.
TNO apparent brightness V=23.5

TNO is 30.3 AU from the Sun and 29.4 AU from the Earth.
The TNO is moving 25.6 km/sec on the sky relative to the star, or, 4.3 arcsec/hr.
The 1-sigma error in the time of the event is 278 seconds.
The 1-sigma cross-track error in the shadow position is 2008 km.

The TNO has an absolute magnitude Hv=8.7
Diameter=109.7 km assuming a 5% albedo -- 4.3 sec chord
Diameter=44.8 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 29981, (2019/01/01 19:18UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:28.6 +27:58:44  1.1 16.06 119
Alhena         06:38:48.6 +16:22:53  1.9  4.37 134
33 Gem         06:50:55.4 +16:10:47  5.9  1.54 131
PPM 123245     06:55:45.2 +15:48:45  7.6  0.91 130
PPM 123251     06:55:55.7 +16:46:32  9.7  0.28 130
29981          06:57:00.1 +16:40:27 13.6       129
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 29981, (2019/01/01 19:18UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.1 +28:01:33  1.1 16.06 119
Alhena         06:37:42.8 +16:23:57  1.9  4.37 134
33 Gem         06:49:49.8 +16:12:10  5.9  1.54 131
PPM 123245     06:54:39.8 +15:50:16  7.6  0.91 130
PPM 123251     06:54:49.8 +16:48:03  9.7  0.28 130
29981          06:55:54.3 +16:41:59 13.6       130
Positions are for J2000

Event circumstances last updated at 2017/05/20 18:07:52 UT

Marc W. Buie, Southwest Research Institute

RECON