RECON: TNO occultation with 91205

Event between (91205) 98US43 and star GA1040:01404870 with event index number of 1309235

Geocentric closest approach at 2024/01/05 00:23:18 UTC

J2000 position of star is 06:00:22.4 +15:29:38
Equinox of date position of star is 06:01:41.7 +15:29:36
Stellar brightness G=16.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 113 degrees from the moon. Moon is 42% illuminated.
Apparent brightness V=24.0

Object is 38.2 AU from the Sun and 37.3 AU from the Earth.
Apparent velocity is 24.6 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 311 seconds.
The 1-sigma cross-track error in the shadow position is 1681 km.

The object has an absolute magnitude Hv=8.2
Diameter=151.4 km assuming a 5% albedo -- 5.5 sec chord
Diameter=61.8 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 91205, (2024/01/05 00:18UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:28.3 +07:24:34  0.4  8.19 114
Alhena         06:39:05.9 +16:22:36  1.9  9.02 104
137 Tau        05:53:44.2 +14:10:33  5.5  2.34 115
PPM 121698     06:00:25.4 +15:18:54  8.2  0.37 114
PPM 121724     06:01:20.8 +15:36:35  9.4  0.15 113
91205          06:01:45.1 +15:29:36 16.2       113
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 91205, (2024/01/05 00:18UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  8.19 114
Alhena         06:37:42.8 +16:23:57  1.9  9.02 104
137 Tau        05:52:22.2 +14:10:18  5.5  2.34 115
PPM 121698     05:59:02.8 +15:18:53  8.2  0.37 114
PPM 121724     05:59:58.0 +15:36:37  9.4  0.15 113
91205          06:00:22.4 +15:29:38 16.2       113
Positions are for J2000

Event circumstances last updated at 2023/01/12 04:52:28 UT

Marc W. Buie, Southwest Research Institute

RECON