RECON: TNO occultation with 15810

Event between (15810) Arawn and star GA0700:33365488 with event index number of 1130757

Geocentric closest approach at 2021/11/02 10:04:33 UTC

J2000 position of star is 19:34:14.6 -19:41:46
Equinox of date position of star is 19:35:31.1 -19:38:51
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 106 degrees from the moon. Moon is 9% illuminated.
TNO apparent brightness V=23.4

TNO is 35.9 AU from the Sun and 36.2 AU from the Earth.
The TNO is moving 14.8 km/sec on the sky relative to the star, or, 2.0 arcsec/hr.
The 1-sigma error in the time of the event is 307 seconds.
The 1-sigma cross-track error in the shadow position is 2033 km.

The TNO has an absolute magnitude Hv=7.7
Diameter=173.8 km assuming a 5% albedo -- 11.7 sec chord
Diameter=70.9 km assuming a 30% albedo -- 4.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 15810, (2021/11/02 10:02UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:45.0 -26:28:43  0.9 42.82  64
Nunki          18:56:37.1 -26:16:04  2.0 11.13  96
PPM 236251     19:38:19.3 -18:10:51  5.7  1.61 106
PPM 236121     19:32:59.2 -19:20:20  7.4  0.67 105
PPM 236202     19:36:02.4 -19:37:33  9.7  0.12 106
15810          19:35:31.3 -19:38:50 16.6       106
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 15810, (2021/11/02 10:02UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 42.82  64
Nunki          18:55:15.9 -26:17:49  2.0 11.13  96
PPM 236251     19:37:03.4 -18:13:52  5.7  1.61 106
PPM 236121     19:31:42.6 -19:23:11  7.4  0.67 105
PPM 236202     19:34:45.7 -19:40:30  9.7  0.12 106
15810          19:34:14.6 -19:41:46 16.6       106
Positions are for J2000

Event circumstances last updated at 2021/10/07 00:32:48 UT

Marc W. Buie, Southwest Research Institute

RECON