RECON: TNO occultation with 13GW136

Event between 13GW136 and star GA0720:05638845 with event index number of 2054033

Geocentric closest approach at 2022/08/14 09:46:12 UTC

J2000 position of star is 15:41:58.3 -17:20:05
Equinox of date position of star is 15:43:11.9 -17:24:08
Stellar brightness G=12.8, use SENSEUP=32 with the MallinCam and and exposure time of 500 milli-seconds with the QHY174 camera.
Star is 116 degrees from the moon. Moon is 92% illuminated.
TNO apparent brightness V=22.7

TNO is 31.6 AU from the Sun and 31.5 AU from the Earth.
The TNO is moving 3.3 km/sec on the sky relative to the star, or, 0.5 arcsec/hr.
The 1-sigma error in the time of the event is 471 seconds.
The 1-sigma cross-track error in the shadow position is 2074 km.

The TNO has an absolute magnitude Hv=7.5
Diameter=185.4 km assuming a 5% albedo -- 56.9 sec chord
Diameter=75.7 km assuming a 30% albedo -- 23.2 sec chord
Dynamical classification is 2:1E
 
 
 
 
 
 
 
 

Star training set for 13GW136, (2022/08/14 09:34UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:47.9 -26:28:49  0.9 14.26 103
8Bet1Sco       16:06:45.4 -19:51:56  2.6  6.08 110
44Eta Lib      15:45:21.0 -15:44:36  5.4  1.74 116
PPM 230662     15:45:14.4 -16:56:21  7.2  0.66 116
PPM 230621     15:43:27.9 -17:26:47  9.1  0.06 116
13GW136        15:43:15.6 -17:24:21 12.8       116
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 13GW136, (2022/08/14 09:34UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 14.26 103
8Bet1Sco       16:05:26.2 -19:48:20  2.6  6.08 110
44Eta Lib      15:44:04.4 -15:40:24  5.4  1.74 116
PPM 230662     15:43:57.2 -16:52:09  7.2  0.66 116
PPM 230621     15:42:10.5 -17:22:32  9.1  0.06 116
13GW136        15:41:58.3 -17:20:05 12.8       116
Positions are for J2000

Event circumstances last updated at 2021/07/12 00:51:32 UT

Marc W. Buie, Southwest Research Institute

RECON