RECON: TNO occultation with 13VF24

Event between 13VF24 and star GA1040:01380139 with event index number of 2467002

Geocentric closest approach at 2022/12/18 23:32:21 UTC

J2000 position of star is 05:59:10.0 +14:47:23
Equinox of date position of star is 06:00:28.0 +14:47:24
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 118 degrees from the moon. Moon is 25% illuminated.
TNO apparent brightness V=22.5

TNO is 27.5 AU from the Sun and 26.5 AU from the Earth.
The TNO is moving 24.2 km/sec on the sky relative to the star, or, 4.5 arcsec/hr.
The 1-sigma error in the time of the event is 100 seconds.
The 1-sigma cross-track error in the shadow position is 1269 km.

The TNO has an absolute magnitude Hv=8.2
Diameter=140.6 km assuming a 5% albedo -- 5.8 sec chord
Diameter=57.4 km assuming a 30% albedo -- 2.4 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 
 
 

Star training set for 13VF24, (2022/12/18 23:32UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:24.9 +07:24:34  0.4  7.45 118
Alhena         06:39:02.3 +16:22:40  1.9  9.42 109
137 Tau        05:53:40.6 +14:10:32  5.5  1.76 119
PPM 121665     05:59:07.6 +14:41:06  8.1  0.34 118
PPM 121691     06:00:14.7 +15:00:36 10.0  0.23 118
13VF24         06:00:28.8 +14:47:24 15.6       118
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 13VF24, (2022/12/18 23:32UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  7.45 118
Alhena         06:37:42.8 +16:23:57  1.9  9.42 109
137 Tau        05:52:22.2 +14:10:18  5.5  1.76 119
PPM 121665     05:57:49.0 +14:41:03  8.1  0.34 118
PPM 121691     05:58:55.8 +15:00:35 10.0  0.23 118
13VF24         05:59:10.0 +14:47:23 15.6       118
Positions are for J2000

Event circumstances last updated at 2022/10/01 04:17:52 UT

Marc W. Buie, Southwest Research Institute

RECON