RECON: TNO occultation with 447178

Event between (447178) 05RO43 and star UC4-415-008808 with event index number of 132779

Geocentric closest approach at 2018/08/07 20:14:46 UTC

J2000 position of star is 05:18:09.6 -07:05:22
Equinox of date position of star is 05:19:01.8 -07:04:17
Stellar brightness R=15.4, use SENSEUP=128
Star is 28 degrees from the moon. Moon is 18% illuminated.
TNO apparent brightness V=20.4

TNO is 20.1 AU from the Sun and 20.5 AU from the Earth.
The TNO is moving 26.6 km/sec on the sky relative to the star, or, 6.4 arcsec/hr.
The 1-sigma error in the time of the event is 53 seconds.
The 1-sigma cross-track error in the shadow position is 1040 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 8.6 sec chord
Diameter=93.5 km assuming a 30% albedo -- 3.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 447178, (2018/08/07 20:15UT)
Object            RA         Dec     mag  sep  mel
Rigel          05:15:26.0 -08:10:53  0.1  1.43  29
67Bet Eri      05:08:45.9 -05:03:49  2.8  3.25  26
20Tau Ori      05:18:30.6 -06:49:32  3.6  0.28  27
PPM 187935     05:20:15.3 -07:19:45  8.1  0.39  28
20Tau Ori      05:18:30.6 -06:49:32  3.6  0.28  27
447178         05:19:03.8 -07:04:15 15.4        27
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 447178, (2018/08/07 20:15UT)
Object            RA         Dec     mag  sep  mel
Rigel          05:14:32.3 -08:12:06  0.1  1.43  29
67Bet Eri      05:07:50.9 -05:05:13  2.8  3.25  26
20Tau Ori      05:17:36.4 -06:50:40  3.6  0.28  27
PPM 187935     05:19:21.2 -07:20:50  8.1  0.39  28
20Tau Ori      05:17:36.4 -06:50:40  3.6  0.28  27
447178         05:18:09.6 -07:05:22 15.4        28
Positions are for J2000

Event circumstances last updated at 2017/12/05 18:51:50 UT

Marc W. Buie, Southwest Research Institute

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