RECON: TNO occultation with 55576

Event between (55576) Amycus and star GA0640:38154522 with event index number of 2572902

Geocentric closest approach at 2022/11/04 03:27:18 UTC

J2000 position of star is 19:52:20.6 -25:07:16
Equinox of date position of star is 19:53:43.1 -25:03:40
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 53 degrees from the moon. Moon is 80% illuminated.
TNO apparent brightness V=21.3

TNO is 23.1 AU from the Sun and 23.4 AU from the Earth.
The TNO is moving 15.0 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 100 seconds.
The 1-sigma cross-track error in the shadow position is 1093 km.

The TNO has an absolute magnitude Hv=7.4
Diameter=219.8 km assuming a 5% albedo -- 13.1 sec chord
Diameter=89.7 km assuming a 30% albedo -- 5.3 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 55576, (2022/11/04 03:29UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:54.5 -29:30:02  1.2 41.12  22
38Zet Sgr      19:04:03.8 -29:50:44  2.7 12.00  65
PPM 270417     19:55:39.7 -23:52:57  6.1  1.26  53
PPM 270382     19:54:06.0 -24:56:04  8.4  0.15  53
PPM 270389     19:54:14.0 -25:08:41  8.9  0.14  53
55576          19:53:43.4 -25:03:39 15.7        53
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 55576, (2022/11/04 03:29UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 41.12  22
38Zet Sgr      19:02:36.7 -29:52:49  2.7 12.00  65
PPM 270417     19:54:17.6 -23:56:37  6.1  1.26  53
PPM 270382     19:52:43.2 -24:59:41  8.4  0.15  53
PPM 270389     19:52:51.1 -25:12:19  8.9  0.14  53
55576          19:52:20.6 -25:07:16 15.7        53
Positions are for J2000

Event circumstances last updated at 2022/10/03 04:12:01 UT

Marc W. Buie, Southwest Research Institute

RECON