RECON: TNO occultation with 523703

Event between (523703) 14HX199 and star GA0740:07581555 with event index number of 2333487

Geocentric closest approach at 2028/05/01 01:39:03 UTC

J2000 position of star is 17:20:10.1 -15:14:44
Equinox of date position of star is 17:21:30.5 -15:16:04
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 142 degrees from the moon. Moon is 39% illuminated.
Apparent brightness V=22.2

Object is 30.8 AU from the Sun and 30.0 AU from the Earth.
Apparent velocity is 16.8 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 219 seconds.
The 1-sigma cross-track error in the shadow position is 1562 km.

The object has an absolute magnitude Hv=7.2
Diameter=221.8 km assuming a 5% albedo -- 13.3 sec chord
Diameter=90.6 km assuming a 30% albedo -- 5.4 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 523703, (2028/05/01 01:34UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:09.0 -26:29:32  0.9 16.28 132
35Eta Oph      17:12:00.3 -15:45:29  2.6  2.41 140
PPM 232892     17:19:57.3 -16:20:23  5.9  1.16 142
PPM 232909     17:20:35.3 -15:14:54  8.1  0.29 142
PPM 232917     17:20:58.9 -15:22:26  9.5  0.22 142
523703         17:21:47.4 -15:16:20 16.5       142
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 523703, (2028/05/01 01:34UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 16.28 132
35Eta Oph      17:10:22.7 -15:43:29  2.6  2.41 140
PPM 232892     17:18:19.3 -16:18:42  5.9  1.16 142
PPM 232909     17:18:58.0 -15:13:15  8.1  0.29 142
PPM 232917     17:19:21.5 -15:20:47  9.5  0.22 142
523703         17:20:10.1 -15:14:44 16.5       142
Positions are for J2000

Event circumstances last updated at 2023/05/30 02:56:20 UT

Marc W. Buie, Southwest Research Institute

RECON