RECON: TNO occultation with 471155

Event between (471155) 10GF65 and star GA0540:12495854 with event index number of 1764284

Geocentric closest approach at 2021/06/24 19:20:35 UTC

J2000 position of star is 16:52:10.6 -35:12:37
Equinox of date position of star is 16:53:34.4 -35:14:39
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 21 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=20.7

TNO is 22.8 AU from the Sun and 21.8 AU from the Earth.
The TNO is moving 20.9 km/sec on the sky relative to the star, or, 4.8 arcsec/hr.
The 1-sigma error in the time of the event is 273 seconds.
The 1-sigma cross-track error in the shadow position is 1692 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 10.9 sec chord
Diameter=93.5 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 471155, (2021/06/24 19:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.7 -26:28:40  0.9 10.04  24
26Eps Sco      16:51:33.5 -34:19:49  2.3  1.01  21
PPM 295772     17:02:03.2 -35:57:53  5.7  1.86  19
PPM 295567     16:53:24.7 -35:29:38  7.5  0.25  21
471155         16:53:36.1 -35:14:41 16.3        20
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 471155, (2021/06/24 19:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 10.04  24
26Eps Sco      16:50:08.8 -34:17:41  2.3  1.01  21
PPM 295772     17:00:37.0 -35:56:04  5.7  1.86  19
PPM 295567     16:51:59.1 -35:27:33  7.5  0.25  21
471155         16:52:10.6 -35:12:37 16.3        21
Positions are for J2000

Event circumstances last updated at 2021/01/22 21:28:13 UT

Marc W. Buie, Southwest Research Institute

RECON