RECON: TNO occultation with 12YG12

Event between 12YG12 and star GA1000:01644988 with event index number of 2037597

Geocentric closest approach at 2022/09/04 19:24:18 UTC

J2000 position of star is 06:19:57.4 +11:19:41
Equinox of date position of star is 06:21:11.6 +11:19:02
Stellar brightness G=17.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 162 degrees from the moon. Moon is 62% illuminated.
TNO apparent brightness V=22.3

TNO is 33.4 AU from the Sun and 33.8 AU from the Earth.
The TNO is moving 16.3 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 356 seconds.
The 1-sigma cross-track error in the shadow position is 3479 km.

The TNO has an absolute magnitude Hv=6.9
Diameter=253.5 km assuming a 5% albedo -- 15.6 sec chord
Diameter=103.5 km assuming a 30% albedo -- 6.4 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 12YG12, (2022/09/04 19:24UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:24.0 +07:24:34  0.4  7.26 160
Alhena         06:39:01.3 +16:22:41  1.9  6.65 164
PPM 122323     06:22:08.2 +11:44:40  6.4  0.48 163
PPM 122263     06:20:05.2 +11:09:15  7.2  0.32 162
PPM 122303     06:21:29.3 +11:03:04  9.4  0.27 162
PPM 122289     06:20:47.4 +11:10:48 10.4  0.17 162
12YG12         06:21:13.2 +11:19:01 17.0       162
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 12YG12, (2022/09/04 19:24UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  7.26 160
Alhena         06:37:42.8 +16:23:57  1.9  6.65 164
PPM 122323     06:20:52.1 +11:45:22  6.4  0.48 163
PPM 122263     06:18:49.5 +11:09:53  7.2  0.32 162
PPM 122303     06:20:13.7 +11:03:45  9.4  0.27 162
PPM 122289     06:19:31.7 +11:11:28 10.4  0.17 162
12YG12         06:19:57.4 +11:19:41 17.0       162
Positions are for J2000

Event circumstances last updated at 2022/03/14 01:07:27 UT

Marc W. Buie, Southwest Research Institute

RECON