RECON: TNO occultation with 555915

Event between (555915) 14GX53 and star GA0820:04710728 with event index number of 2476563

Geocentric closest approach at 2022/01/29 03:20:34 UTC

J2000 position of star is 15:20:02.6 -06:55:58
Equinox of date position of star is 15:21:12.3 -07:00:37
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 39 degrees from the moon. Moon is 13% illuminated.
TNO apparent brightness V=21.0

TNO is 35.1 AU from the Sun and 35.2 AU from the Earth.
The TNO is moving 12.0 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 121 seconds.
The 1-sigma cross-track error in the shadow position is 1359 km.

The TNO has an absolute magnitude Hv=5.4
Diameter=494.3 km assuming a 5% albedo -- 41.0 sec chord
Diameter=201.8 km assuming a 30% albedo -- 16.7 sec chord
Dynamical classification is 11:7EEEE
 
 
 
 
 
 
 
 

Star training set for 555915, (2022/01/29 03:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:45.9 -26:28:45  0.9 25.55  17
27Bet Lib      15:18:11.9 -09:27:47  2.6  2.56  38
PPM 198488     15:22:17.8 -05:54:12  5.4  1.14  40
PPM 198498     15:22:43.1 -06:54:18  7.6  0.39  39
PPM 198460     15:20:39.9 -06:55:00  9.5  0.17  39
555915         15:21:13.2 -07:00:41 16.6        39
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 555915, (2022/01/29 03:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 25.55  17
27Bet Lib      15:17:00.3 -09:22:59  2.6  2.56  38
PPM 198488     15:21:07.5 -05:49:30  5.4  1.14  40
PPM 198498     15:21:32.5 -06:49:37  7.6  0.39  39
PPM 198460     15:19:29.3 -06:50:16  9.5  0.17  39
555915         15:20:02.6 -06:55:58 16.6        39
Positions are for J2000

Event circumstances last updated at 2021/10/12 02:03:38 UT

Marc W. Buie, Southwest Research Institute

RECON