RECON: TNO occultation with 169071

Event between (169071) 01FR185 and star UC4-328-080590 with event index number of 356543

Geocentric closest approach at 2020/02/11 14:17:44 UTC

J2000 position of star is 15:53:54.5 -24:32:10
Equinox of date position of star is 15:55:02.2 -24:35:26
Stellar brightness R=14.4, use SENSEUP=128
Star is 68 degrees from the moon. Moon is 92% illuminated.
TNO apparent brightness V=23.3

TNO is 32.2 AU from the Sun and 32.4 AU from the Earth.
The TNO is moving 11.1 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 1143 seconds.
The 1-sigma cross-track error in the shadow position is 3459 km.

The TNO has an absolute magnitude Hv=8.0
Diameter=151.4 km assuming a 5% albedo -- 13.6 sec chord
Diameter=61.8 km assuming a 30% albedo -- 5.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 169071, (2020/02/11 14:18UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:38.6 -26:28:30  0.9  8.23  76
7Del Sco       16:01:31.6 -22:40:39  2.3  2.41  69
PPM 264828     15:55:06.3 -24:35:30  5.3  0.00  68
PPM 264863     15:56:35.0 -24:43:41  8.4  0.36  68
PPM 264828     15:55:06.3 -24:35:30  5.3  0.00  68
169071         15:55:06.9 -24:35:39 14.4        68
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 169071, (2020/02/11 14:18UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  8.23  76
7Del Sco       16:00:20.0 -22:37:18  2.3  2.41  69
PPM 264828     15:53:53.9 -24:32:00  5.3  0.00  68
PPM 264863     15:55:22.5 -24:40:13  8.4  0.36  68
PPM 264828     15:53:53.9 -24:32:00  5.3  0.00  68
169071         15:53:54.5 -24:32:10 14.4        68
Positions are for J2000

Event circumstances last updated at 2018/10/25 20:54:49 UT

Marc W. Buie, Southwest Research Institute

RECON