RECON: TNO occultation with 469708

Event between (469708) 05GE187 and star GA0840:09182464 with event index number of 2166682

Geocentric closest approach at 2028/09/08 13:03:29 UTC

J2000 position of star is 18:32:19.9 -05:15:14
Equinox of date position of star is 18:33:30.7 -05:14:10
Stellar brightness G=17.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 115 degrees from the moon. Moon is 82% illuminated.
TNO apparent brightness V=22.0

TNO is 26.7 AU from the Sun and 26.3 AU from the Earth.
The TNO is moving 9.0 km/sec on the sky relative to the star, or, 1.7 arcsec/hr.
The 1-sigma error in the time of the event is 213 seconds.
The 1-sigma cross-track error in the shadow position is 2645 km.

The TNO has an absolute magnitude Hv=7.6
Diameter=184.5 km assuming a 5% albedo -- 20.6 sec chord
Diameter=75.3 km assuming a 30% albedo -- 8.4 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 469708, (2028/09/08 13:04UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:10.3 -26:29:35  0.9 36.17 147
60Bet Oph      17:44:53.5 +04:33:26  2.8 15.66 122
PPM 201808     18:31:46.3 -05:42:10  6.2  0.70 115
PPM 201847     18:34:38.8 -05:08:21  7.1  0.22 114
PPM 201843     18:34:13.8 -05:20:38  9.5  0.15 115
469708         18:33:51.6 -05:13:51 17.0       114
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 469708, (2028/09/08 13:04UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 36.17 147
60Bet Oph      17:43:28.3 +04:34:06  2.8 15.66 122
PPM 201808     18:30:14.3 -05:43:28  6.2  0.70 115
PPM 201847     18:33:07.1 -05:09:46  7.1  0.22 114
PPM 201843     18:32:42.0 -05:22:02  9.5  0.15 115
469708         18:32:19.9 -05:15:14 17.0       115
Positions are for J2000

Event circumstances last updated at 2022/02/19 00:42:26 UT

Marc W. Buie, Southwest Research Institute

RECON