RECON: TNO occultation with 470593

Event between (470593) 08LP17 and star GA0640:12640408 with event index number of 2271022

Geocentric closest approach at 2022/10/03 19:05:00 UTC

J2000 position of star is 17:15:08.2 -25:18:04
Equinox of date position of star is 17:16:32.2 -25:19:31
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 31 degrees from the moon. Moon is 59% illuminated.
TNO apparent brightness V=21.6

TNO is 31.0 AU from the Sun and 31.3 AU from the Earth.
The TNO is moving 17.5 km/sec on the sky relative to the star, or, 2.8 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 1195 km.

The TNO has an absolute magnitude Hv=6.5
Diameter=346.7 km assuming a 5% albedo -- 17.1 sec chord
Diameter=141.6 km assuming a 30% albedo -- 7.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 470593, (2022/10/03 19:05UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:48.4 -26:28:50  0.9 10.35  41
23Tau Sco      16:37:18.2 -28:15:41  2.8  9.23  39
PPM 266626     17:17:37.5 -26:34:36  6.5  1.28  31
PPM 266633     17:17:51.9 -25:19:45  7.3  0.30  31
PPM 266615     17:16:47.9 -25:26:51  9.8  0.14  31
470593         17:16:32.3 -25:19:31 16.5        31
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 470593, (2022/10/03 19:05UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 10.35  41
23Tau Sco      16:35:52.9 -28:12:58  2.8  9.23  39
PPM 266626     17:16:12.6 -26:33:11  6.5  1.28  31
PPM 266633     17:16:27.8 -25:18:20  7.3  0.30  31
PPM 266615     17:15:23.7 -25:25:24  9.8  0.14  31
470593         17:15:08.2 -25:18:04 16.5        31
Positions are for J2000

Event circumstances last updated at 2022/10/02 04:07:41 UT

Marc W. Buie, Southwest Research Institute

RECON