RECON: TNO occultation with 500886

Event between (500886) 13JN65 and star GA0720:06145857 with event index number of 1169829

Geocentric closest approach at 2021/04/10 06:28:27 UTC

J2000 position of star is 16:25:35.5 -16:43:48
Equinox of date position of star is 16:26:48.0 -16:46:36
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 113 degrees from the moon. Moon is 3% illuminated.
TNO apparent brightness V=23.6

TNO is 41.2 AU from the Sun and 40.5 AU from the Earth.
The TNO is moving 15.5 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 183 seconds.
The 1-sigma cross-track error in the shadow position is 1994 km.

The TNO has an absolute magnitude Hv=7.4
Diameter=199.5 km assuming a 5% albedo -- 12.8 sec chord
Diameter=81.5 km assuming a 30% albedo -- 5.2 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 500886, (2021/04/10 06:28UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:42.9 -26:28:39  0.9  9.74 110
8Bet1Sco       16:06:40.6 -19:51:43  2.6  5.69 117
8Phi Oph       16:32:21.6 -16:39:27  4.0  1.33 112
PPM 231620     16:24:07.0 -17:04:03  7.3  0.71 114
PPM 231671     16:26:21.1 -16:33:44  9.9  0.24 113
500886         16:26:48.8 -16:46:38 16.6       113
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 500886, (2021/04/10 06:28UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  9.74 110
8Bet1Sco       16:05:26.2 -19:48:20  2.6  5.69 117
8Phi Oph       16:31:08.3 -16:36:46  4.0  1.33 112
PPM 231620     16:22:53.6 -17:01:09  7.3  0.71 114
PPM 231671     16:25:07.9 -16:30:54  9.9  0.24 113
500886         16:25:35.5 -16:43:48 16.6       113
Positions are for J2000

Event circumstances last updated at 2021/01/19 21:58:03 UT

Marc W. Buie, Southwest Research Institute

RECON