RECON: TNO occultation with 03HM57

Event between 03HM57 and star GA0540:23296383 with event index number of 2000247

Geocentric closest approach at 2021/09/16 09:09:00 UTC

J2000 position of star is 17:49:40.2 -34:01:42
Equinox of date position of star is 17:51:06.3 -34:02:00
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 29 degrees from the moon. Moon is 77% illuminated.
TNO apparent brightness V=20.5

TNO is 14.7 AU from the Sun and 14.5 AU from the Earth.
The TNO is moving 9.1 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 223 seconds.
The 1-sigma cross-track error in the shadow position is 994 km.

The TNO has an absolute magnitude Hv=8.5
Diameter=120.2 km assuming a 5% albedo -- 13.2 sec chord
Diameter=49.1 km assuming a 30% albedo -- 5.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 03HM57, (2021/09/16 09:09UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:44.5 -26:28:42  0.9 18.88  47
34Ups Sco      17:32:14.5 -37:18:40  2.7  5.04  33
PPM 296936     17:54:15.6 -34:07:06  5.8  0.66  28
PPM 296874     17:52:11.6 -34:13:09  8.0  0.29  29
PPM 296844     17:50:50.3 -34:05:59  9.2  0.09  29
03HM57         17:51:06.6 -34:02:00 16.4        29
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 03HM57, (2021/09/16 09:09UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 18.88  47
34Ups Sco      17:30:45.8 -37:17:46  2.7  5.04  33
PPM 296936     17:52:49.2 -34:06:53  5.8  0.66  28
PPM 296874     17:50:45.2 -34:12:52  8.0  0.29  29
PPM 296844     17:49:23.9 -34:05:41  9.2  0.09  29
03HM57         17:49:40.2 -34:01:42 16.4        29
Positions are for J2000

Event circumstances last updated at 2021/08/25 04:09:32 UT

Marc W. Buie, Southwest Research Institute

RECON