RECON: TNO occultation with 471136

Event between (471136) 10EO65 and star GA0580:30399108 with event index number of 2267711

Geocentric closest approach at 2021/10/01 19:53:58 UTC

J2000 position of star is 18:06:12.1 -30:50:07
Equinox of date position of star is 18:07:36.0 -30:49:54
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 142 degrees from the moon. Moon is 24% illuminated.
TNO apparent brightness V=21.8

TNO is 15.6 AU from the Sun and 15.7 AU from the Earth.
The TNO is moving 13.8 km/sec on the sky relative to the star, or, 4.4 arcsec/hr.
The 1-sigma error in the time of the event is 298 seconds.
The 1-sigma cross-track error in the shadow position is 2120 km.

The TNO has an absolute magnitude Hv=9.5
Diameter=75.9 km assuming a 5% albedo -- 5.5 sec chord
Diameter=31.0 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 471136, (2021/10/01 19:54UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:44.7 -26:28:42  0.9 21.65 120
Kap Sco        17:43:59.6 -39:02:21  2.4  9.52 136
10Gam2Sgr      18:07:12.3 -30:25:18  3.0  0.42 141
PPM 297232     18:07:19.0 -30:39:26  8.4  0.19 141
PPM 297219     18:06:57.0 -30:50:08  8.6  0.14 141
471136         18:07:36.3 -30:49:54 16.3       142
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 471136, (2021/10/01 19:54UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 21.65 120
Kap Sco        17:42:29.3 -39:01:49  2.4  9.52 136
10Gam2Sgr      18:05:48.4 -30:25:31  3.0  0.42 141
PPM 297232     18:05:54.9 -30:39:39  8.4  0.19 141
PPM 297219     18:05:32.8 -30:50:20  8.6  0.14 141
471136         18:06:12.1 -30:50:07 16.3       141
Positions are for J2000

Event circumstances last updated at 2021/08/29 01:39:55 UT

Marc W. Buie, Southwest Research Institute

RECON