RECON: TNO occultation with 85627

Event between (85627) 98HP151 and star GA0660:12561863 with event index number of 1117400

Geocentric closest approach at 2021/05/09 16:18:51 UTC

J2000 position of star is 17:23:39.9 -23:49:52
Equinox of date position of star is 17:24:57.7 -23:50:58
Stellar brightness G=15.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 125 degrees from the moon. Moon is 4% illuminated.
TNO apparent brightness V=23.6

TNO is 41.2 AU from the Sun and 40.3 AU from the Earth.
The TNO is moving 19.8 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 256 seconds.
The 1-sigma cross-track error in the shadow position is 1906 km.

The TNO has an absolute magnitude Hv=7.4
Diameter=199.5 km assuming a 5% albedo -- 10.1 sec chord
Diameter=81.5 km assuming a 30% albedo -- 4.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 85627, (2021/05/09 16:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.2 -26:28:39  0.9 12.55 136
35Eta Oph      17:11:36.3 -15:45:00  2.6  8.69 128
PPM 266836     17:26:24.7 -24:15:41  6.4  0.53 124
PPM 266814     17:25:21.7 -23:51:46  7.0  0.09 124
85627          17:24:58.0 -23:50:59 15.8       124
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 85627, (2021/05/09 16:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 12.55 136
35Eta Oph      17:10:22.7 -15:43:29  2.6  8.69 128
PPM 266836     17:25:06.3 -24:14:37  6.4  0.53 124
PPM 266814     17:24:03.5 -23:50:40  7.0  0.09 124
85627          17:23:39.9 -23:49:52 15.8       124
Positions are for J2000

Event circumstances last updated at 2021/04/05 23:46:13 UT

Marc W. Buie, Southwest Research Institute

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