RECON: TNO occultation with 500884

Event between (500884) 13JK65 and star UC4-357-080098 with event index number of 221279

Geocentric closest approach at 2018/05/23 02:05:28 UTC

J2000 position of star is 16:50:54.9 -18:45:35
Equinox of date position of star is 16:51:57.7 -18:47:21
Stellar brightness R=15.8, use SENSEUP=128
Star is 90 degrees from the moon. Moon is 60% illuminated.
TNO apparent brightness V=24.3

TNO is 29.6 AU from the Sun and 28.6 AU from the Earth.
The TNO is moving 23.0 km/sec on the sky relative to the star, or, 4.0 arcsec/hr.
The 1-sigma error in the time of the event is 299 seconds.
The 1-sigma cross-track error in the shadow position is 3659 km.

The TNO has an absolute magnitude Hv=9.6
Diameter=72.4 km assuming a 5% albedo -- 3.2 sec chord
Diameter=29.6 km assuming a 30% albedo -- 1.3 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 500884, (2018/05/23 02:05UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.3 -26:28:17  0.9  9.13  86
35Eta Oph      17:11:26.0 -15:44:47  2.6  5.55  94
PPM 232367     16:58:08.8 -19:34:04  6.1  1.65  91
PPM 232201     16:50:35.0 -18:57:27  8.2  0.37  89
PPM 232240     16:52:43.4 -18:46:52  9.8  0.17  90
500884         16:51:59.4 -18:47:24 15.8        90
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 500884, (2018/05/23 02:05UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  9.13  86
35Eta Oph      17:10:22.7 -15:43:29  2.6  5.55  94
PPM 232367     16:57:03.9 -19:32:25  6.1  1.65  91
PPM 232201     16:49:30.4 -18:55:37  8.2  0.37  89
PPM 232240     16:51:38.9 -18:45:05  9.8  0.17  90
500884         16:50:54.9 -18:45:35 15.8        90
Positions are for J2000

Event circumstances last updated at 2017/12/02 17:33:58 UT

Marc W. Buie, Southwest Research Institute

RECON