RECON: TNO occultation with 09YR26

Event between 09YR26 and star GA1080:02925141 with event index number of 2076087

Geocentric closest approach at 2021/11/23 03:10:26 UTC

J2000 position of star is 07:46:08.9 +19:31:34
Equinox of date position of star is 07:47:25.0 +19:28:18
Stellar brightness G=12.0, use SENSEUP=16 with the MallinCam and and exposure time of 250 milli-seconds with the QHY174 camera.
Star is 14 degrees from the moon. Moon is 88% illuminated.
TNO apparent brightness V=22.0

TNO is 40.2 AU from the Sun and 39.7 AU from the Earth.
The TNO is moving 13.4 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 162 seconds.
The 1-sigma cross-track error in the shadow position is 1460 km.

The TNO has an absolute magnitude Hv=5.9
Diameter=390.9 km assuming a 5% albedo -- 29.1 sec chord
Diameter=159.6 km assuming a 30% albedo -- 11.9 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 09YR26, (2021/11/23 03:10UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:39.2 +27:58:18  1.1  8.50  12
85 Gem         07:56:56.4 +19:49:28  5.4  2.27  16
PPM 124448     07:48:51.4 +18:59:23  8.3  0.59  15
PPM 124381     07:45:28.5 +19:50:10  9.2  0.59  14
PPM 124426     07:48:03.9 +19:41:31 11.2  0.27  14
09YR26         07:47:25.5 +19:28:16 12.0        14
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 09YR26, (2021/11/23 03:10UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1  8.50  12
85 Gem         07:55:39.9 +19:53:01  5.4  2.27  16
PPM 124448     07:47:35.1 +19:02:42  8.3  0.59  15
PPM 124381     07:44:11.7 +19:53:24  9.2  0.59  14
PPM 124426     07:46:47.3 +19:44:49 11.2  0.27  14
09YR26         07:46:08.9 +19:31:34 12.0        14
Positions are for J2000

Event circumstances last updated at 2021/10/03 01:35:12 UT

Marc W. Buie, Southwest Research Institute

RECON