RECON: TNO occultation with 471155

Event between (471155) 10GF65 and star UC4-289-083418 with event index number of 145844

Geocentric closest approach at 2018/07/18 21:11:19 UTC

J2000 position of star is 15:56:10.9 -32:15:31
Equinox of date position of star is 15:57:19.0 -32:18:35
Stellar brightness R=16.1, use SENSEUP=128
Star is 52 degrees from the moon. Moon is 40% illuminated.
TNO apparent brightness V=20.9

TNO is 23.4 AU from the Sun and 22.8 AU from the Earth.
The TNO is moving 11.7 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 332 seconds.
The 1-sigma cross-track error in the shadow position is 2965 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 19.6 sec chord
Diameter=93.5 km assuming a 30% albedo -- 8.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 471155, (2018/07/18 21:11UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.8 -26:28:18  0.9  9.29  56
Eta Lup        16:01:21.4 -38:26:53  2.8  6.19  55
PPM 294436     15:57:24.3 -31:50:19  6.5  0.47  51
PPM 294453     15:58:15.5 -32:18:15  9.9  0.19  52
471155         15:57:21.3 -32:18:41 16.1        52
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 471155, (2018/07/18 21:11UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  9.29  56
Eta Lup        16:00:07.3 -38:23:48  2.8  6.19  55
PPM 294436     15:56:14.1 -31:47:09  6.5  0.47  51
PPM 294453     15:57:05.0 -32:15:06  9.9  0.19  52
471155         15:56:10.9 -32:15:31 16.1        52
Positions are for J2000

Event circumstances last updated at 2017/12/05 18:48:43 UT

Marc W. Buie, Southwest Research Institute

RECON