RECON: TNO occultation with 15KG174

Event between 15KG174 and star GA0660:07742115 with event index number of 2449411

Geocentric closest approach at 2023/04/19 22:24:31 UTC

J2000 position of star is 16:42:33.0 -22:48:42
Equinox of date position of star is 16:43:51.5 -22:51:06
Stellar brightness G=12.2, use SENSEUP=16 with the MallinCam and and exposure time of 250 milli-seconds with the QHY174 camera.
Star is 134 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=23.6

TNO is 30.9 AU from the Sun and 30.1 AU from the Earth.
The TNO is moving 15.5 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 198 seconds.
The 1-sigma cross-track error in the shadow position is 1900 km.

The TNO has an absolute magnitude Hv=8.6
Diameter=110.2 km assuming a 5% albedo -- 7.4 sec chord
Diameter=45.0 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 
 
 

Star training set for 15KG174, (2023/04/19 22:25UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:50.4 -26:28:54  0.9  4.69 136
23Tau Sco      16:37:20.2 -28:15:44  2.8  5.61 135
PPM 232040     16:43:16.1 -19:58:02  5.8  2.89 135
PPM 265858     16:45:03.7 -22:46:43  7.9  0.27 134
PPM 265816     16:43:38.3 -22:44:45  9.7  0.13 134
15KG174        16:43:57.0 -22:51:16 12.2       134
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 15KG174, (2023/04/19 22:25UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  4.69 136
23Tau Sco      16:35:52.9 -28:12:58  2.8  5.61 135
PPM 232040     16:41:53.8 -19:55:27  5.8  2.89 135
PPM 265858     16:43:39.7 -22:44:12  7.9  0.27 134
PPM 265816     16:42:14.3 -22:42:11  9.7  0.13 134
15KG174        16:42:33.0 -22:48:42 12.2       134
Positions are for J2000

Event circumstances last updated at 2021/10/08 00:58:34 UT

Marc W. Buie, Southwest Research Institute

RECON