RECON: TNO occultation with 04XX190

Event between 04XX190 and star GA1120:02392455 with event index number of 1979747

Geocentric closest approach at 2022/09/12 15:55:58 UTC

J2000 position of star is 06:43:02.8 +23:46:22
Equinox of date position of star is 06:44:23.9 +23:44:57
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 81 degrees from the moon. Moon is 94% illuminated.
TNO apparent brightness V=23.2

TNO is 42.0 AU from the Sun and 42.4 AU from the Earth.
The TNO is moving 14.6 km/sec on the sky relative to the star, or, 1.7 arcsec/hr.
The 1-sigma error in the time of the event is 617 seconds.
The 1-sigma cross-track error in the shadow position is 3335 km.

The TNO has an absolute magnitude Hv=6.8
Diameter=258.2 km assuming a 5% albedo -- 17.7 sec chord
Diameter=105.4 km assuming a 30% albedo -- 7.2 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 04XX190, (2022/09/12 15:56UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:42.2 +27:58:10  1.1 14.62  94
Alhena         06:39:01.4 +16:22:41  1.9  7.48  80
PPM 096264     06:38:50.7 +24:34:12  6.5  1.52  80
PPM 096508     06:47:32.9 +23:20:45  7.4  0.82  82
PPM 096427     06:44:23.5 +24:06:45  9.5  0.36  81
PPM 096439     06:44:54.9 +23:55:57 10.4  0.22  81
04XX190        06:44:25.7 +23:44:55 15.7        81
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 04XX190, (2022/09/12 15:56UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 14.62  94
Alhena         06:37:42.8 +16:23:57  1.9  7.48  80
PPM 096264     06:37:27.2 +24:35:27  6.5  1.52  80
PPM 096508     06:46:10.3 +23:22:18  7.4  0.82  82
PPM 096427     06:43:00.4 +24:08:11  9.5  0.36  81
PPM 096439     06:43:31.9 +23:57:25 10.4  0.22  81
04XX190        06:43:02.8 +23:46:22 15.7        81
Positions are for J2000

Event circumstances last updated at 2022/03/13 02:16:14 UT

Marc W. Buie, Southwest Research Institute

RECON