RECON: TNO occultation with 82155

Event between (82155) 01FZ173 and star GA0620:06971181 with event index number of 2436926

Geocentric closest approach at 2022/04/11 15:25:40 UTC

J2000 position of star is 14:55:33.7 -26:37:13
Equinox of date position of star is 14:56:52.3 -26:42:32
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 92 degrees from the moon. Moon is 72% illuminated.
TNO apparent brightness V=21.5

TNO is 33.9 AU from the Sun and 33.0 AU from the Earth.
The TNO is moving 20.1 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 107 seconds.
The 1-sigma cross-track error in the shadow position is 1576 km.

The TNO has an absolute magnitude Hv=6.2
Diameter=343.6 km assuming a 5% albedo -- 17.1 sec chord
Diameter=140.3 km assuming a 30% albedo -- 7.0 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 82155, (2022/04/11 15:25UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:46.6 -26:28:46  0.9 20.96 112
5The Cen       14:08:00.1 -36:28:43  2.1 14.25  87
59 Hya         14:59:58.7 -27:44:43  5.7  1.24  93
PPM 263595     14:58:19.0 -26:53:27  8.4  0.37  92
PPM 263560     14:56:26.4 -27:03:50  9.7  0.37  92
82155          14:56:52.6 -26:42:33 16.9        92
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 82155, (2022/04/11 15:25UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 20.96 112
5The Cen       14:06:40.0 -36:22:23  2.1 14.25  87
59 Hya         14:58:39.2 -27:39:27  5.7  1.24  93
PPM 263595     14:57:00.0 -26:48:08  8.4  0.37  92
PPM 263560     14:55:07.4 -26:58:29  9.7  0.37  92
82155          14:55:33.7 -26:37:13 16.9        92
Positions are for J2000

Event circumstances last updated at 2022/03/12 01:35:39 UT

Marc W. Buie, Southwest Research Institute

RECON