RECON: TNO occultation with 591370

Event between (591370) 13ME14 and star GA1000:19290218 with event index number of 2706617

Geocentric closest approach at 2023/07/11 01:22:02 UTC

J2000 position of star is 22:00:46.1 +11:09:11
Equinox of date position of star is 22:01:50.4 +11:15:32
Stellar brightness G=17.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 57 degrees from the moon. Moon is 40% illuminated.
TNO apparent brightness V=22.9

TNO is 21.8 AU from the Sun and 21.1 AU from the Earth.
The TNO is moving 17.8 km/sec on the sky relative to the star, or, 4.2 arcsec/hr.
The 1-sigma error in the time of the event is 88 seconds.
The 1-sigma cross-track error in the shadow position is 1918 km.

The TNO has an absolute magnitude Hv=9.4
Diameter=80.5 km assuming a 5% albedo -- 4.5 sec chord
Diameter=32.9 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 591370, (2023/07/11 01:22UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:14.1 +45:21:55  1.3 38.11  73
Markab         23:05:56.1 +15:19:56  2.5 16.09  41
PPM 140969     22:03:10.7 +11:05:17  6.4  0.36  57
PPM 140946     22:02:09.1 +11:00:52  9.9  0.26  57
PPM 140927     22:01:19.4 +11:21:57 11.1  0.18  57
591370         22:01:55.3 +11:16:01 17.0        57
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 591370, (2023/07/11 01:22UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 38.11  73
Markab         23:04:45.8 +15:12:18  2.5 16.09  41
PPM 140969     22:02:01.4 +10:58:26  6.4  0.36  57
PPM 140946     22:00:59.8 +10:54:02  9.9  0.26  57
PPM 140927     22:00:10.2 +11:15:08 11.1  0.18  57
591370         22:00:46.1 +11:09:11 17.0        57
Positions are for J2000

Event circumstances last updated at 2021/11/02 23:24:20 UT

Marc W. Buie, Southwest Research Institute

RECON