RECON: TNO occultation with 84922

Event between (84922) 03VS2 and star GA1220:01821364 with event index number of 1146398

Geocentric closest approach at 2021/04/09 01:57:55 UTC

J2000 position of star is 05:29:27.4 +32:21:28
Equinox of date position of star is 05:30:50.4 +32:22:23
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 99 degrees from the moon. Moon is 9% illuminated.
TNO apparent brightness V=19.8

TNO is 36.7 AU from the Sun and 37.2 AU from the Earth.
The TNO is moving 18.2 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 132 seconds.
The 1-sigma cross-track error in the shadow position is 1383 km.

The TNO has an absolute magnitude Hv=4.0
Diameter=968.3 km assuming a 5% albedo -- 53.2 sec chord
Diameter=395.3 km assuming a 30% albedo -- 21.7 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 84922, (2021/04/09 01:58UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:08.6 +16:33:01  0.8 19.95  84
Alnath         05:27:38.3 +28:37:24  1.6  3.81  98
25Chi Aur      05:34:06.8 +32:12:21  4.8  0.71  99
PPM 070525     05:34:22.6 +31:53:06  7.5  0.89  99
PPM 070424     05:30:19.1 +32:19:31  9.7  0.12  99
84922          05:30:50.7 +32:22:23 16.8        99
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 84922, (2021/04/09 01:58UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 19.95  84
Alnath         05:26:17.5 +28:36:23  1.6  3.81  98
25Chi Aur      05:32:43.7 +32:11:31  4.8  0.71  99
PPM 070525     05:32:59.7 +31:52:18  7.5  0.89  99
PPM 070424     05:28:55.8 +32:18:35  9.7  0.12  99
84922          05:29:27.4 +32:21:28 16.8        99
Positions are for J2000

Event circumstances last updated at 2021/03/13 00:30:29 UT

Marc W. Buie, Southwest Research Institute

RECON