RECON: TNO occultation with 12WF37

Event between 12WF37 and star GA0920:00370707 with event index number of 2034832

Geocentric closest approach at 2023/08/08 21:56:04 UTC

J2000 position of star is 04:06:52.9 +03:24:57
Equinox of date position of star is 04:08:01.3 +03:28:22
Stellar brightness G=14.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 21 degrees from the moon. Moon is 45% illuminated.
TNO apparent brightness V=22.9

TNO is 28.8 AU from the Sun and 29.0 AU from the Earth.
The TNO is moving 16.2 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 255 seconds.
The 1-sigma cross-track error in the shadow position is 1592 km.

The TNO has an absolute magnitude Hv=8.1
Diameter=120.8 km assuming a 5% albedo -- 8.8 sec chord
Diameter=49.3 km assuming a 30% albedo -- 3.6 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 
 
 

Star training set for 12WF37, (2023/08/08 21:55UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:16.7 +16:33:18  0.8 14.91  19
Menkar         03:03:31.0 +04:10:51  2.5 16.13  16
PPM 147177     04:05:24.0 +02:53:22  5.9  0.90  21
PPM 147262     04:10:57.2 +03:22:58  7.1  0.71  21
PPM 147209     04:07:57.5 +03:41:12 10.0  0.21  21
12WF37         04:08:07.1 +03:28:40 14.4        21
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 12WF37, (2023/08/08 21:55UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 14.91  19
Menkar         03:02:16.8 +04:05:21  2.5 16.13  16
PPM 147177     04:04:10.1 +02:49:34  5.9  0.90  21
PPM 147262     04:09:42.9 +03:19:20  7.1  0.71  21
PPM 147209     04:06:43.1 +03:37:28 10.0  0.21  21
12WF37         04:06:52.9 +03:24:57 14.4        21
Positions are for J2000

Event circumstances last updated at 2021/10/08 01:08:18 UT

Marc W. Buie, Southwest Research Institute

RECON