RECON: TNO occultation with 15BC519

Event between 15BC519 and star GA1040:03225498 with event index number of 1155160

Geocentric closest approach at 2021/05/22 15:45:36 UTC

J2000 position of star is 08:52:33.0 +15:49:00
Equinox of date position of star is 08:53:43.3 +15:44:11
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 58 degrees from the moon. Moon is 80% illuminated.
TNO apparent brightness V=22.4

TNO is 35.1 AU from the Sun and 35.4 AU from the Earth.
The TNO is moving 15.6 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 161 seconds.
The 1-sigma cross-track error in the shadow position is 1420 km.

The TNO has an absolute magnitude Hv=6.8
Diameter=267.9 km assuming a 5% albedo -- 17.2 sec chord
Diameter=109.4 km assuming a 30% albedo -- 7.0 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 
 
 

Star training set for 15BC519, (2021/05/22 15:46UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:30.5 +11:51:43  1.3 18.79  39
54 Cnc         08:52:12.8 +15:16:12  6.4  0.59  58
PPM 125819     08:52:22.5 +15:55:06  8.1  0.38  58
PPM 125855     08:54:07.2 +15:44:07  9.4  0.09  57
15BC519        08:53:44.6 +15:44:06 16.5        57
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 15BC519, (2021/05/22 15:46UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 18.79  39
54 Cnc         08:51:01.3 +15:21:04  6.4  0.59  58
PPM 125819     08:51:10.8 +15:59:58  8.1  0.38  58
PPM 125855     08:52:55.6 +15:49:02  9.4  0.09  57
15BC519        08:52:33.0 +15:49:00 16.5        58
Positions are for J2000

Event circumstances last updated at 2021/01/02 19:52:48 UT

Marc W. Buie, Southwest Research Institute

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