RECON: TNO occultation with 31824

Event between (31824) Elatus and star GA0840:04304447 with event index number of 2195488

Geocentric closest approach at 2022/04/20 19:16:43 UTC

J2000 position of star is 13:36:37.9 -04:43:25
Equinox of date position of star is 13:37:45.9 -04:50:03
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 61 degrees from the moon. Moon is 79% illuminated.
TNO apparent brightness V=22.0

TNO is 15.9 AU from the Sun and 14.9 AU from the Earth.
The TNO is moving 23.6 km/sec on the sky relative to the star, or, 7.8 arcsec/hr.
The 1-sigma error in the time of the event is 51 seconds.
The 1-sigma cross-track error in the shadow position is 790 km.

The TNO has an absolute magnitude Hv=10.1
Diameter=56.5 km assuming a 5% albedo -- 2.4 sec chord
Diameter=23.1 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 31824, (2022/04/20 19:17UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:22.3 -11:16:37  1.0  7.03  61
80 Vir         13:36:41.1 -05:30:33  5.7  0.73  61
PPM 196750     13:41:35.0 -05:21:27  8.4  1.08  60
PPM 196697     13:38:31.8 -04:55:02  8.7  0.20  61
31824          13:37:47.6 -04:50:13 15.7        61
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, (2022/04/20 19:17UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0  7.03  61
80 Vir         13:35:31.3 -05:23:44  5.7  0.73  61
PPM 196750     13:40:25.2 -05:14:42  8.4  1.08  60
PPM 196697     13:37:22.2 -04:48:16  8.7  0.20  61
31824          13:36:37.9 -04:43:25 15.7        61
Positions are for J2000

Event circumstances last updated at 2021/10/12 02:07:44 UT

Marc W. Buie, Southwest Research Institute

RECON