RECON: TNO occultation with 601690

Event between (601690) 13KZ18 and star GA1360:00389048 with event index number of 2733226

Geocentric closest approach at 2026/11/07 17:05:50 UTC

J2000 position of star is 00:54:49.4 +46:03:09
Equinox of date position of star is 00:56:10.1 +46:10:50
Stellar brightness G=13.9, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 147 degrees from the moon. Moon is 3% illuminated.
Apparent brightness V=22.3

Object is 21.5 AU from the Sun and 20.7 AU from the Earth.
Apparent velocity is 22.3 km/sec on the sky relative to the star, or, 5.4 arcsec/hr.
The 1-sigma error in the time of the event is 85 seconds.
The 1-sigma cross-track error in the shadow position is 1829 km.

The object has an absolute magnitude Hv=8.9
Diameter=100.5 km assuming a 5% albedo -- 4.6 sec chord
Diameter=41.0 km assuming a 30% albedo -- 1.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 601690, (2026/11/07 17:08UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:20.9 +45:22:39  1.3 43.06 112
57Gam1And      02:05:33.6 +42:27:26  2.3 12.90 151
PPM 043369     00:51:48.9 +45:08:53  6.1  1.31 148
PPM 043401     00:53:55.3 +45:57:04  8.2  0.49 147
PPM 043463     00:57:23.3 +46:04:47  9.9  0.22 148
601690         00:56:21.0 +46:11:52 13.9       147
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 601690, (2026/11/07 17:08UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 43.06 112
57Gam1And      02:03:54.1 +42:19:46  2.3 12.90 151
PPM 043369     00:50:18.4 +45:00:08  6.1  1.31 148
PPM 043401     00:52:24.3 +45:48:20  8.2  0.49 147
PPM 043463     00:55:51.7 +45:56:05  9.9  0.22 148
601690         00:54:49.4 +46:03:09 13.9       147
Positions are for J2000

Event circumstances last updated at 2023/09/03 03:54:17 UT

Marc W. Buie, Southwest Research Institute

RECON