RECON: TNO occultation with 04LW31

Event between 04LW31 and star GA0680:35238623 with event index number of 2577569

Geocentric closest approach at 2023/08/01 16:06:20 UTC

J2000 position of star is 19:33:07.0 -20:59:35
Equinox of date position of star is 19:34:30.6 -20:56:27
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 17 degrees from the moon. Moon is 100% illuminated.
Apparent brightness V=23.7

Object is 44.7 AU from the Sun and 43.7 AU from the Earth.
Apparent velocity is 23.4 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 344 seconds.
The 1-sigma cross-track error in the shadow position is 3526 km.

The object has an absolute magnitude Hv=7.2
Diameter=216.8 km assuming a 5% albedo -- 9.3 sec chord
Diameter=88.5 km assuming a 30% albedo -- 3.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 04LW31, (2023/08/01 16:06UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:51.4 -26:28:56  0.9 42.18  58
Nunki          18:56:43.6 -26:15:55  2.0 10.16  25
50 Sgr         19:27:43.4 -21:43:41  5.6  1.77  18
PPM 269906     19:32:48.2 -20:59:20  7.5  0.40  17
PPM 269960     19:35:16.7 -20:56:09  9.2  0.18  17
04LW31         19:34:30.6 -20:56:27 16.5        17
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 04LW31, (2023/08/01 16:06UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 42.18  58
Nunki          18:55:15.9 -26:17:49  2.0 10.16  25
50 Sgr         19:26:19.2 -21:46:36  5.6  1.77  18
PPM 269906     19:31:24.6 -21:02:25  7.5  0.40  17
PPM 269960     19:33:53.1 -20:59:18  9.2  0.18  17
04LW31         19:33:07.0 -20:59:35 16.5        17
Positions are for J2000

Event circumstances last updated at 2023/07/27 03:49:00 UT

Marc W. Buie, Southwest Research Institute

RECON