RECON: TNO occultation with 28978

Event between (28978) Ixion and star GA0580:29777043 with event index number of 1213046

Geocentric closest approach at 2022/07/25 11:32:57 UTC

J2000 position of star is 18:04:29.2 -30:47:39
Equinox of date position of star is 18:05:55.2 -30:47:29
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 174 degrees from the moon. Moon is 9% illuminated.
TNO apparent brightness V=19.5

TNO is 38.4 AU from the Sun and 37.6 AU from the Earth.
The TNO is moving 20.5 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 303 seconds.
The 1-sigma cross-track error in the shadow position is 2531 km.

The TNO has an absolute magnitude Hv=3.6
Diameter=1148.2 km assuming a 5% albedo -- 55.9 sec chord
Diameter=468.7 km assuming a 30% albedo -- 22.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 28978, (2022/07/25 11:33UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:47.7 -26:28:48  0.9 21.27 163
Kap Sco        17:44:03.0 -39:02:22  2.4  9.39 167
10Gam2Sgr      18:07:15.5 -30:25:18  3.0  0.47 174
PPM 297208     18:06:16.6 -30:33:33  8.1  0.24 174
PPM 297205     18:06:10.0 -30:45:08  9.2  0.06 174
28978          18:05:56.6 -30:47:28 16.3       174
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, (2022/07/25 11:33UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 21.27 163
Kap Sco        17:42:29.3 -39:01:49  2.4  9.39 167
10Gam2Sgr      18:05:48.4 -30:25:31  3.0  0.47 174
PPM 297208     18:04:49.5 -30:33:44  8.1  0.24 174
PPM 297205     18:04:42.6 -30:45:19  9.2  0.06 174
28978          18:04:29.2 -30:47:39 16.3       174
Positions are for J2000

Event circumstances last updated at 2022/03/15 01:07:52 UT

Marc W. Buie, Southwest Research Institute

RECON