RECON: TNO occultation with 99XY143

Event between 99XY143 and star GA1080:02588166 with event index number of 2516790

Geocentric closest approach at 2021/10/31 23:19:49 UTC

J2000 position of star is 07:01:47.3 +19:14:59
Equinox of date position of star is 07:03:04.1 +19:13:02
Stellar brightness G=15.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 62 degrees from the moon. Moon is 20% illuminated.
TNO apparent brightness V=22.8

TNO is 45.0 AU from the Sun and 44.6 AU from the Earth.
The TNO is moving 8.5 km/sec on the sky relative to the star, or, 0.9 arcsec/hr.
The 1-sigma error in the time of the event is 1010 seconds.
The 1-sigma cross-track error in the shadow position is 3588 km.

The TNO has an absolute magnitude Hv=6.2
Diameter=351.6 km assuming a 5% albedo -- 41.3 sec chord
Diameter=143.5 km assuming a 30% albedo -- 16.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 99XY143, (2021/10/31 23:20UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:38.9 +27:58:18  1.1 13.27  53
Alhena         06:38:58.4 +16:22:44  1.9  6.40  68
36 Gem         06:52:51.5 +21:44:00  5.3  3.47  64
PPM 123394     07:02:26.2 +19:10:55  8.4  0.15  62
99XY143        07:03:04.3 +19:13:02 15.4        62
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 99XY143, (2021/10/31 23:20UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 13.27  53
Alhena         06:37:42.8 +16:23:57  1.9  6.40  68
36 Gem         06:51:33.0 +21:45:39  5.3  3.47  64
PPM 123394     07:01:09.2 +19:12:52  8.4  0.15  62
99XY143        07:01:47.3 +19:14:59 15.4        62
Positions are for J2000

Event circumstances last updated at 2021/10/13 01:29:28 UT

Marc W. Buie, Southwest Research Institute

RECON