RECON: TNO occultation with 143685

Event between (143685) 03SS317 and star UC4-505-003970 with event index number of 208979

Geocentric closest approach at 2019/09/02 20:50:46 UTC

J2000 position of star is 02:33:22.6 +10:58:04
Equinox of date position of star is 02:34:20.6 +11:02:45
Stellar brightness R=12.2, use SENSEUP=16
Star is 169 degrees from the moon. Moon is 17% illuminated.
TNO apparent brightness V=22.5

TNO is 28.3 AU from the Sun and 27.8 AU from the Earth.
The TNO is moving 9.4 km/sec on the sky relative to the star, or, 1.7 arcsec/hr.
The 1-sigma error in the time of the event is 241 seconds.
The 1-sigma cross-track error in the shadow position is 1360 km.

The TNO has an absolute magnitude Hv=7.8
Diameter=166.0 km assuming a 5% albedo -- 17.7 sec chord
Diameter=67.8 km assuming a 30% albedo -- 7.2 sec chord
Dynamical classification is 4:3E
 
 
 
 
 
 
 
 

Star training set for 143685, (2019/09/02 20:51UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:03.1 +16:32:50  0.8 30.24 139
Menkar         03:03:18.6 +04:09:57  2.5  9.93 162
PPM 118239     02:28:26.4 +10:17:05  6.4  1.66 170
PPM 118344     02:35:29.9 +11:41:24  6.7  0.69 168
PPM 118308     02:32:59.0 +11:11:47  9.8  0.38 169
PPM 118325     02:34:06.5 +10:46:49 11.0  0.28 169
143685         02:34:26.3 +11:03:13 12.2       169
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 143685, (2019/09/02 20:51UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 30.24 139
Menkar         03:02:16.8 +04:05:22  2.5  9.93 162
PPM 118239     02:27:23.0 +10:11:50  6.4  1.66 170
PPM 118344     02:34:26.0 +11:36:17  6.7  0.69 168
PPM 118308     02:31:55.3 +11:06:36  9.8  0.38 169
PPM 118325     02:33:02.9 +10:41:40 11.0  0.28 169
143685         02:33:22.6 +10:58:04 12.2       169
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:15:05 UT

Marc W. Buie, Southwest Research Institute

RECON