RECON: TNO occultation with 28978

Event between (28978) Ixion and star GA0580:34875161 with event index number of 1213745

Geocentric closest approach at 2023/02/26 04:55:57 UTC

J2000 position of star is 18:18:11.0 -30:45:40
Equinox of date position of star is 18:19:40.1 -30:45:02
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 140 degrees from the moon. Moon is 39% illuminated.
Apparent brightness V=19.5

Object is 38.3 AU from the Sun and 38.7 AU from the Earth.
Apparent velocity is 19.1 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 386 seconds.
The 1-sigma cross-track error in the shadow position is 3718 km.

The object has an absolute magnitude Hv=3.5
Diameter=1148.2 km assuming a 5% albedo -- 63.7 sec chord
Diameter=468.7 km assuming a 30% albedo -- 26.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 28978, (2023/02/26 04:56UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:49.9 -26:28:53  0.9 24.20 164
Nunki          18:56:42.0 -26:15:57  2.0  9.28 132
18 Sgr         18:26:30.7 -30:44:34  5.3  1.47 139
PPM 297487     18:18:00.2 -30:23:43  8.2  0.51 140
PPM 297501     18:18:49.0 -30:42:17  9.5  0.19 140
28978          18:19:40.6 -30:45:02 16.8       140
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, (2023/02/26 04:56UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 24.20 164
Nunki          18:55:15.9 -26:17:49  2.0  9.28 132
18 Sgr         18:25:01.2 -30:45:26  5.3  1.47 139
PPM 297487     18:16:30.9 -30:24:18  8.2  0.51 140
PPM 297501     18:17:19.5 -30:42:53  9.5  0.19 140
28978          18:18:11.0 -30:45:40 16.8       140
Positions are for J2000

Event circumstances last updated at 2023/01/08 03:30:48 UT

Marc W. Buie, Southwest Research Institute

RECON