RECON: TNO occultation with 558093

Event between (558093) 14WW535 and star GA0840:03815767 with event index number of 2414781

Geocentric closest approach at 2022/01/29 16:55:49 UTC

J2000 position of star is 09:36:23.6 -05:37:29
Equinox of date position of star is 09:37:28.9 -05:43:23
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 123 degrees from the moon. Moon is 9% illuminated.
TNO apparent brightness V=22.9

TNO is 24.1 AU from the Sun and 23.3 AU from the Earth.
The TNO is moving 21.8 km/sec on the sky relative to the star, or, 4.7 arcsec/hr.
The 1-sigma error in the time of the event is 160 seconds.
The 1-sigma cross-track error in the shadow position is 1368 km.

The TNO has an absolute magnitude Hv=9.0
Diameter=95.1 km assuming a 5% albedo -- 4.4 sec chord
Diameter=38.8 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 558093, (2022/01/29 16:56UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:32.7 +11:51:30  1.3 19.30 125
Alphard        09:28:40.4 -08:45:19  2.0  3.74 123
33 Hya         09:35:38.7 -06:00:52  5.6  0.54 123
PPM 192538     09:36:13.2 -05:28:07  7.3  0.41 123
PPM 192558     09:37:38.2 -05:58:01  9.3  0.24 123
558093         09:37:29.8 -05:43:28 15.7       123
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 558093, (2022/01/29 16:56UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 19.30 125
Alphard        09:27:35.2 -08:39:30  2.0  3.74 123
33 Hya         09:34:32.7 -05:54:55  5.6  0.54 123
PPM 192538     09:35:07.0 -05:22:09  7.3  0.41 123
PPM 192558     09:36:32.1 -05:52:02  9.3  0.24 123
558093         09:36:23.6 -05:37:29 15.7       123
Positions are for J2000

Event circumstances last updated at 2021/10/12 02:03:39 UT

Marc W. Buie, Southwest Research Institute

RECON