RECON: TNO occultation with 28978

Event between (28978) Ixion and star GA0600:30062320 with event index number of 248143

Geocentric closest approach at 2020/03/02 16:38:01 UTC

J2000 position of star is 17:59:07.1 -29:28:25
Equinox of date position of star is 18:00:21.5 -29:28:26
Stellar brightness G=16.3, use SENSEUP=128
Star is 160 degrees from the moon. Moon is 49% illuminated.
TNO apparent brightness V=19.7

TNO is 39.0 AU from the Sun and 39.3 AU from the Earth.
The TNO is moving 14.6 km/sec on the sky relative to the star, or, 1.8 arcsec/hr.
The 1-sigma error in the time of the event is 376 seconds.
The 1-sigma cross-track error in the shadow position is 3630 km.

The TNO has an absolute magnitude Hv=3.6
Diameter=1148.2 km assuming a 5% albedo -- 78.7 sec chord
Diameter=468.7 km assuming a 30% albedo -- 32.1 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 28978, (2020/03/02 16:38UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:38.8 -26:28:30  0.9 20.01 173
34Ups Sco      17:32:08.2 -37:18:36  2.7  9.80 159
Gam1Sgr        18:06:18.5 -29:34:38  4.7  1.29 158
PPM 267599     18:00:05.1 -29:55:19  8.1  0.45 159
PPM 267621     18:00:39.5 -29:29:01  9.2  0.06 159
28978          18:00:24.4 -29:28:26 16.3       159
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 28978, (2020/03/02 16:38UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 20.01 173
34Ups Sco      17:30:45.8 -37:17:46  2.7  9.80 159
Gam1Sgr        18:05:01.2 -29:34:48  4.7  1.29 158
PPM 267599     17:58:47.6 -29:55:18  8.1  0.45 159
PPM 267621     17:59:22.2 -29:29:01  9.2  0.06 159
28978          17:59:07.1 -29:28:25 16.3       159
Positions are for J2000

Event circumstances last updated at 2019/06/07 23:19:39 UT

Marc W. Buie, Southwest Research Institute

RECON