RECON: TNO occultation with 202421

Event between (202421) 05UQ513 and star GA1240:00184862 with event index number of 2177326

Geocentric closest approach at 2021/11/28 17:59:17 UTC

J2000 position of star is 00:58:13.6 +34:21:59
Equinox of date position of star is 00:59:25.9 +34:29:03
Stellar brightness G=9.3, use SENSEUP=2 with the MallinCam and and exposure time of 125 milli-seconds with the QHY174 camera.
Star is 134 degrees from the moon. Moon is 37% illuminated.
TNO apparent brightness V=20.9

TNO is 47.8 AU from the Sun and 47.1 AU from the Earth.
The TNO is moving 20.9 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 84 seconds.
The 1-sigma cross-track error in the shadow position is 1759 km.

The TNO has an absolute magnitude Hv=4.0
Diameter=959.4 km assuming a 5% albedo -- 46.0 sec chord
Diameter=391.7 km assuming a 30% albedo -- 18.8 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 202421, (2021/11/28 17:59UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:10.8 +45:21:34  1.3 49.16 114
57Gam1And      02:05:15.2 +42:26:02  2.3 15.10 120
69Sig Psc      01:04:01.4 +31:55:17  5.4  2.74 135
PPM 065815     00:59:26.7 +34:04:07  7.2  0.42 134
PPM 065813     00:59:26.1 +34:29:05 10.0  0.00 134
202421         00:59:26.1 +34:29:04  9.3       133
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 202421, (2021/11/28 17:59UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 49.16 114
57Gam1And      02:03:54.0 +42:19:46  2.3 15.10 120
69Sig Psc      01:02:49.1 +31:48:15  5.4  2.74 135
PPM 065815     00:58:14.3 +33:57:02  7.2  0.42 134
PPM 065813     00:58:13.7 +34:22:00 10.0  0.00 134
202421         00:58:13.6 +34:21:59  9.3       134
Positions are for J2000

Event circumstances last updated at 2021/11/08 00:15:56 UT

Marc W. Buie, Southwest Research Institute

RECON