RECON: TNO occultation with 99CY118

Event between 99CY118 and star GA0960:04010869 with event index number of 2244908

Geocentric closest approach at 2022/05/22 23:51:39 UTC

J2000 position of star is 14:19:21.6 +07:15:33
Equinox of date position of star is 14:20:26.5 +07:09:35
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 124 degrees from the moon. Moon is 48% illuminated.
TNO apparent brightness V=24.5

TNO is 37.3 AU from the Sun and 36.4 AU from the Earth.
The TNO is moving 19.8 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 446 seconds.
The 1-sigma cross-track error in the shadow position is 2308 km.

The TNO has an absolute magnitude Hv=8.7
Diameter=111.7 km assuming a 5% albedo -- 5.6 sec chord
Diameter=45.6 km assuming a 30% albedo -- 2.3 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 99CY118, (2022/05/22 23:49UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:16:41.1 +19:04:02  0.0 11.95 127
Vindemiatrix   13:03:17.5 +10:50:21  2.8 19.40 144
PPM 160594     14:25:07.2 +08:08:35  5.8  1.52 123
PPM 160543     14:21:27.1 +08:28:49  8.1  1.35 124
PPM 160505     14:18:16.8 +06:39:01  9.0  0.74 125
PPM 160526     14:20:14.5 +07:16:35 10.1  0.13 124
99CY118        14:20:28.2 +07:09:25 15.1       124
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 99CY118, (2022/05/22 23:49UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:15:38.0 +19:10:14  0.0 11.95 127
Vindemiatrix   13:02:10.2 +10:57:33  2.8 19.40 144
PPM 160594     14:24:00.9 +08:14:38  5.8  1.52 123
PPM 160543     14:20:20.9 +08:34:56  8.1  1.35 124
PPM 160505     14:17:09.9 +06:45:11  9.0  0.74 125
PPM 160526     14:19:07.8 +07:22:43 10.1  0.13 124
99CY118        14:19:21.6 +07:15:33 15.1       124
Positions are for J2000

Event circumstances last updated at 2021/10/26 23:53:37 UT

Marc W. Buie, Southwest Research Institute

RECON