RECON: TNO occultation with 444025

Event between (444025) 04HJ79 and star UC4-373-070001 with event index number of 115355

Geocentric closest approach at 2018/04/22 21:13:36 UTC

J2000 position of star is 14:42:06.3 -15:34:17
Equinox of date position of star is 14:43:04.0 -15:38:41
Stellar brightness R=16.1, use SENSEUP=128
Star is 101 degrees from the moon. Moon is 50% illuminated.
TNO apparent brightness V=23.4

TNO is 44.4 AU from the Sun and 43.4 AU from the Earth.
The TNO is moving 24.6 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 127 seconds.
The 1-sigma cross-track error in the shadow position is 1902 km.

The TNO has an absolute magnitude Hv=6.9
Diameter=251.2 km assuming a 5% albedo -- 10.2 sec chord
Diameter=102.6 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 444025, (2018/04/22 21:14UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:09.6 -11:15:23  1.0 19.21  81
27Bet Lib      15:17:59.7 -09:26:58  2.6 10.53 107
5 Lib          14:46:58.5 -15:32:08  6.5  0.94 101
PPM 229130     14:41:54.6 -15:23:53  8.5  0.38 100
PPM 229139     14:42:18.0 -15:34:30  9.8  0.21 100
444025         14:43:07.0 -15:38:55 16.1       101
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 444025, (2018/04/22 21:14UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 19.21  81
27Bet Lib      15:17:00.3 -09:22:59  2.6 10.53 107
5 Lib          14:45:57.7 -15:27:34  6.5  0.94 101
PPM 229130     14:40:54.0 -15:19:14  8.5  0.38 100
PPM 229139     14:41:17.3 -15:29:50  9.8  0.21 100
444025         14:42:06.3 -15:34:17 16.1       101
Positions are for J2000

Event circumstances last updated at 2017/05/18 18:01:45 UT

Marc W. Buie, Southwest Research Institute

RECON