RECON: TNO occultation with 00YH2

Event between 00YH2 and star GA0980:02993620 with event index number of 1995108

Geocentric closest approach at 2022/02/22 20:33:50 UTC

J2000 position of star is 07:30:49.2 +08:48:41
Equinox of date position of star is 07:32:00.8 +08:45:50
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 117 degrees from the moon. Moon is 62% illuminated.
TNO apparent brightness V=22.4

TNO is 27.9 AU from the Sun and 27.2 AU from the Earth.
The TNO is moving 17.1 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 234 seconds.
The 1-sigma cross-track error in the shadow position is 2288 km.

The TNO has an absolute magnitude Hv=7.8
Diameter=166.0 km assuming a 5% albedo -- 9.7 sec chord
Diameter=67.8 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 00YH2, (2022/02/22 20:34UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:40.1 +27:58:15  1.1 19.52 117
Alhena         06:38:59.5 +16:22:43  1.9 15.00 131
4Gam CMi       07:29:22.1 +08:52:44  6.0  0.67 117
PPM 152783     07:32:08.7 +08:30:14  7.2  0.26 116
PPM 152769     07:31:50.7 +08:37:11  9.8  0.15 117
00YH2          07:32:01.5 +08:45:48 16.8       116
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 00YH2, (2022/02/22 20:34UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 19.52 117
Alhena         06:37:42.8 +16:23:57  1.9 15.00 131
4Gam CMi       07:28:09.7 +08:55:32  6.0  0.67 117
PPM 152783     07:30:56.5 +08:33:07  7.2  0.26 116
PPM 152769     07:30:38.5 +08:40:03  9.8  0.15 117
00YH2          07:30:49.2 +08:48:41 16.8       117
Positions are for J2000

Event circumstances last updated at 2021/12/03 01:45:18 UT

Marc W. Buie, Southwest Research Institute

RECON