RECON: TNO occultation with 31824

Event between (31824) Elatus and star GA0760:05033032 with event index number of 2195672

Geocentric closest approach at 2026/08/16 11:02:39 UTC

J2000 position of star is 14:41:16.9 -12:03:38
Equinox of date position of star is 14:42:35.7 -12:09:46
Stellar brightness G=16.9, 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 17% illuminated.
Apparent brightness V=22.3

Object is 14.5 AU from the Sun and 14.7 AU from the Earth.
Apparent velocity is 12.7 km/sec on the sky relative to the star, or, 4.3 arcsec/hr.
The 1-sigma error in the time of the event is 154 seconds.
The 1-sigma cross-track error in the shadow position is 1380 km.

The object has an absolute magnitude Hv=10.3
Diameter=56.5 km assuming a 5% albedo -- 4.2 sec chord
Diameter=23.1 km assuming a 30% albedo -- 1.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 31824, (2026/08/16 11:03UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:36.0 -11:17:58  1.0 18.65  12
27Bet Lib      15:18:26.6 -09:28:46  2.6  9.17  40
PPM 229046     14:38:25.3 -12:25:04  6.2  1.08  30
PPM 229169     14:43:46.9 -12:15:59  8.4  0.27  31
PPM 229137     14:42:35.1 -12:16:39  9.7  0.11  31
31824          14:42:43.7 -12:10:23 16.9        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 31824, (2026/08/16 11:03UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 18.65  12
27Bet Lib      15:17:00.3 -09:22:59  2.6  9.17  40
PPM 229046     14:36:58.5 -12:18:12  6.2  1.08  30
PPM 229169     14:42:20.0 -12:09:15  8.4  0.27  31
PPM 229137     14:41:08.2 -12:09:53  9.7  0.11  31
31824          14:41:16.9 -12:03:38 16.9        31
Positions are for J2000

Event circumstances last updated at 2024/03/05 04:39:11 UT

Marc W. Buie, Southwest Research Institute

RECON