RECON: TNO occultation with 91205

Event between (91205) 98US43 and star GA1040:01962426 with event index number of 1771061

Geocentric closest approach at 2027/11/21 18:32:08 UTC

J2000 position of star is 06:29:36.4 +14:38:06
Equinox of date position of star is 06:30:55.4 +14:37:06
Stellar brightness G=15.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 62 degrees from the moon. Moon is 42% illuminated.
Apparent brightness V=24.1

Object is 38.8 AU from the Sun and 38.0 AU from the Earth.
Apparent velocity is 19.4 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 699 seconds.
The 1-sigma cross-track error in the shadow position is 2693 km.

The object has an absolute magnitude Hv=8.2
Diameter=151.4 km assuming a 5% albedo -- 7.0 sec chord
Diameter=61.8 km assuming a 30% albedo -- 2.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 91205, (2027/11/21 18:20UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:41.0 +07:24:35  0.4 11.11  70
Alhena         06:39:19.4 +16:22:23  1.9  2.63  60
PPM 122497     06:28:51.4 +14:52:13  6.2  0.62  62
PPM 122571     06:31:40.5 +14:28:48  7.9  0.18  61
91205          06:31:11.8 +14:36:53 15.5        61
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, (2027/11/21 18:20UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 11.11  70
Alhena         06:37:42.8 +16:23:56  1.9  2.63  60
PPM 122497     06:27:15.8 +14:53:21  6.2  0.62  62
PPM 122571     06:30:05.1 +14:30:03  7.9  0.18  61
91205          06:29:36.4 +14:38:06 15.5        61
Positions are for J2000

Event circumstances last updated at 2023/02/05 03:35:02 UT

Marc W. Buie, Southwest Research Institute

RECON