RECON: TNO occultation with 02GH166

Event between 02GH166 and star GA0640:06822778 with event index number of 1131798

Geocentric closest approach at 2021/04/17 22:01:48 UTC

J2000 position of star is 15:17:47.8 -24:25:22
Equinox of date position of star is 15:19:02.3 -24:29:55
Stellar brightness G=17.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 142 degrees from the moon. Moon is 28% illuminated.
TNO apparent brightness V=22.3

TNO is 31.6 AU from the Sun and 30.7 AU from the Earth.
The TNO is moving 20.9 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 156 seconds.
The 1-sigma cross-track error in the shadow position is 1678 km.

The TNO has an absolute magnitude Hv=7.3
Diameter=212.8 km assuming a 5% albedo -- 10.2 sec chord
Diameter=86.9 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 02GH166, (2021/04/17 22:02UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.0 -26:28:39  0.9 16.28 158
7Del Sco       16:01:35.8 -22:40:50  2.3  9.91 151
PPM 263889     15:11:06.1 -24:03:57  6.5  1.86 140
PPM 264075     15:19:51.1 -24:19:34  8.2  0.25 142
02GH166        15:19:03.2 -24:29:58 17.0       142
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 02GH166, (2021/04/17 22:02UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 16.28 158
7Del Sco       16:00:20.0 -22:37:18  2.3  9.91 151
PPM 263889     15:09:51.3 -23:59:10  6.5  1.86 140
PPM 264075     15:18:35.8 -24:14:58  8.2  0.25 142
02GH166        15:17:47.8 -24:25:22 17.0       142
Positions are for J2000

Event circumstances last updated at 2021/01/20 20:34:52 UT

Marc W. Buie, Southwest Research Institute

RECON