RECON: TNO occultation with 168703

Event between (168703) 00GP183 and star GA0640:07926290 with event index number of 1965930

Geocentric closest approach at 2027/08/01 07:27:21 UTC

J2000 position of star is 16:32:03.6 -25:40:09
Equinox of date position of star is 16:33:32.8 -25:43:10
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 137 degrees from the moon. Moon is 2% illuminated.
Apparent brightness V=21.9

Object is 36.8 AU from the Sun and 36.3 AU from the Earth.
Apparent velocity is 10.3 km/sec on the sky relative to the star, or, 1.4 arcsec/hr.
The 1-sigma error in the time of the event is 247 seconds.
The 1-sigma cross-track error in the shadow position is 1416 km.

The object has an absolute magnitude Hv=6.1
Diameter=368.1 km assuming a 5% albedo -- 36.0 sec chord
Diameter=150.3 km assuming a 30% albedo -- 14.7 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 168703, (2027/08/01 07:25UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:06.2 -26:29:27  0.9  0.97 137
23Tau Sco      16:37:36.3 -28:16:15  2.8  2.69 138
22 Sco         16:31:53.3 -25:10:25  4.5  0.69 137
PPM 265637     16:33:35.4 -26:04:06  8.4  0.34 137
PPM 265613     16:32:35.0 -25:43:01  9.5  0.26 137
168703         16:33:44.9 -25:43:34 16.4       138
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, (2027/08/01 07:25UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  0.97 137
23Tau Sco      16:35:52.9 -28:12:58  2.8  2.69 138
22 Sco         16:30:12.5 -25:06:55  4.5  0.69 137
PPM 265637     16:31:53.8 -26:00:41  8.4  0.34 137
PPM 265613     16:30:53.8 -25:39:33  9.5  0.26 137
168703         16:32:03.6 -25:40:09 16.4       137
Positions are for J2000

Event circumstances last updated at 2024/04/18 03:49:08 UT

Marc W. Buie, Southwest Research Institute

RECON