RECON: TNO occultation with 523703

Event between (523703) 14HX199 and star GA0740:06948304 with event index number of 2333386

Geocentric closest approach at 2027/05/18 00:14:09 UTC

J2000 position of star is 17:09:17.3 -14:29:48
Equinox of date position of star is 17:10:37.2 -14:31:30
Stellar brightness G=15.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 52 degrees from the moon. Moon is 94% illuminated.
Apparent brightness V=22.1

Object is 30.8 AU from the Sun and 29.8 AU from the Earth.
Apparent velocity is 21.5 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 141 seconds.
The 1-sigma cross-track error in the shadow position is 1413 km.

The object has an absolute magnitude Hv=7.2
Diameter=221.8 km assuming a 5% albedo -- 10.4 sec chord
Diameter=90.6 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 523703, (2027/05/18 00:11UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:05.4 -26:29:25  0.9 15.14  42
35Eta Oph      17:11:57.0 -15:45:25  2.6  1.26  52
PPM 232829     17:16:53.8 -14:36:47  5.9  1.47  53
PPM 232740     17:13:32.2 -14:39:07  7.6  0.66  52
PPM 232660     17:10:02.5 -14:28:44  9.3  0.20  51
523703         17:10:50.7 -14:31:46 15.8        52
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, (2027/05/18 00:11UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 15.14  42
35Eta Oph      17:10:22.7 -15:43:29  2.6  1.26  52
PPM 232829     17:15:20.3 -14:35:03  5.9  1.47  53
PPM 232740     17:11:58.6 -14:37:14  7.6  0.66  52
PPM 232660     17:08:29.1 -14:26:43  9.3  0.20  51
523703         17:09:17.3 -14:29:48 15.8        52
Positions are for J2000

Event circumstances last updated at 2023/05/29 02:59:27 UT

Marc W. Buie, Southwest Research Institute

RECON