RECON: TNO occultation with 168703

Event between (168703) 00GP183 and star GA0620:09659837 with event index number of 1966002

Geocentric closest approach at 2028/02/06 00:00:30 UTC

J2000 position of star is 16:47:47.9 -26:06:19
Equinox of date position of star is 16:49:07.3 -26:08:31
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 180 degrees from the moon. Moon is 73% illuminated.
TNO apparent brightness V=21.9

TNO is 36.8 AU from the Sun and 37.3 AU from the Earth.
The TNO is moving 19.4 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 203 seconds.
The 1-sigma cross-track error in the shadow position is 2303 km.

The TNO has an absolute magnitude Hv=6.1
Diameter=366.5 km assuming a 5% albedo -- 18.9 sec chord
Diameter=149.6 km assuming a 30% albedo -- 7.7 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 168703, (2028/02/06 00:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:08.1 -26:29:30  0.9  4.14 176
23Tau Sco      16:37:38.2 -28:16:18  2.8  3.39 177
PPM 265803     16:43:22.7 -27:51:42  6.5  2.19 178
25 Sco         16:48:34.8 -25:34:38  6.8  0.61 179
PPM 265972     16:49:28.0 -26:14:09  9.8  0.08 180
168703         16:49:31.8 -26:09:12 15.7       179
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 168703, (2028/02/06 00:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  4.14 176
23Tau Sco      16:35:52.9 -28:12:58  2.8  3.39 177
PPM 265803     16:41:37.6 -27:48:35  6.5  2.19 178
25 Sco         16:46:51.3 -25:31:43  6.8  0.61 179
PPM 265972     16:47:44.0 -26:11:16  9.8  0.08 180
168703         16:47:47.9 -26:06:19 15.7       180
Positions are for J2000

Event circumstances last updated at 2021/06/24 00:07:09 UT

Marc W. Buie, Southwest Research Institute

RECON