RECON: TNO occultation with 523653

Event between (523653) 11OA60 and star GA0720:33124336 with event index number of 1135248

Geocentric closest approach at 2021/07/25 15:29:16 UTC

J2000 position of star is 20:39:38.9 -17:32:45
Equinox of date position of star is 20:40:50.5 -17:28:13
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 16 degrees from the moon. Moon is 97% illuminated.
TNO apparent brightness V=20.6

TNO is 36.0 AU from the Sun and 34.9 AU from the Earth.
The TNO is moving 24.5 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 65 seconds.
The 1-sigma cross-track error in the shadow position is 1338 km.

The TNO has an absolute magnitude Hv=5.1
Diameter=570.2 km assuming a 5% albedo -- 23.3 sec chord
Diameter=232.8 km assuming a 30% albedo -- 9.5 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 523653, (2021/07/25 15:29UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:50.2 -29:30:27  1.2 33.69  19
38Zet Sgr      19:03:58.9 -29:50:51  2.7 25.32  39
15Ups Cap      20:41:16.4 -18:03:41  5.2  0.60  16
PPM 237784     20:42:32.3 -17:18:02  7.1  0.43  16
PPM 237730     20:40:17.8 -17:36:42  9.6  0.20  17
523653         20:40:52.2 -17:28:07 16.7        16
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 523653, (2021/07/25 15:29UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 33.69  19
38Zet Sgr      19:02:36.7 -29:52:49  2.7 25.32  39
15Ups Cap      20:40:02.9 -18:08:20  5.2  0.60  16
PPM 237784     20:41:19.2 -17:22:43  7.1  0.43  16
PPM 237730     20:39:04.5 -17:41:19  9.6  0.20  17
523653         20:39:38.9 -17:32:45 16.7        16
Positions are for J2000

Event circumstances last updated at 2021/01/24 20:37:08 UT

Marc W. Buie, Southwest Research Institute

RECON