RECON: TNO occultation with 82155

Event between (82155) 01FZ173 and star GA0620:06985569 with event index number of 2436981

Geocentric closest approach at 2023/08/13 19:12:49 UTC

J2000 position of star is 14:57:24.3 -26:57:21
Equinox of date position of star is 14:58:47.8 -27:02:57
Stellar brightness G=9.3, use SENSEUP=2 with the MallinCam and and exposure time of 125 milli-seconds with the QHY174 camera.
Star is 118 degrees from the moon. Moon is 6% illuminated.
Apparent brightness V=21.7

Object is 34.2 AU from the Sun and 34.2 AU from the Earth.
Apparent velocity is 8.0 km/sec on the sky relative to the star, or, 1.2 arcsec/hr.
The 1-sigma error in the time of the event is 219 seconds.
The 1-sigma cross-track error in the shadow position is 1389 km.

The object has an absolute magnitude Hv=6.2
Diameter=345.2 km assuming a 5% albedo -- 43.9 sec chord
Diameter=140.9 km assuming a 30% albedo -- 17.9 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 82155, (2023/08/13 19:16UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:51.6 -26:28:56  0.9 20.53 138
5The Cen       14:08:04.9 -36:29:05  2.1 14.30 110
59 Hya         15:00:03.5 -27:45:02  5.7  0.75 118
PPM 263595     14:58:23.8 -26:53:46  8.4  0.18 118
PPM 263616     14:59:06.7 -27:07:04  9.1  0.10 118
82155          14:58:48.1 -27:02:59  9.3       118
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, (2023/08/13 19:16UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 20.53 138
5The Cen       14:06:40.0 -36:22:23  2.1 14.30 110
59 Hya         14:58:39.2 -27:39:27  5.7  0.75 118
PPM 263595     14:57:00.0 -26:48:08  8.4  0.18 118
PPM 263616     14:57:42.7 -27:01:27  9.1  0.10 118
82155          14:57:24.3 -26:57:21  9.3       118
Positions are for J2000

Event circumstances last updated at 2023/07/04 04:03:46 UT

Marc W. Buie, Southwest Research Institute

RECON