RECON: TNO occultation with 120181

Event between (120181) 03UR292 and star GA1080:00604300 with event index number of 1380366

Geocentric closest approach at 2024/11/04 01:56:35 UTC

J2000 position of star is 04:34:48.2 +19:13:28
Equinox of date position of star is 04:36:12.7 +19:16:22
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 173 degrees from the moon. Moon is 6% illuminated.
Apparent brightness V=21.7

Object is 27.5 AU from the Sun and 26.6 AU from the Earth.
Apparent velocity is 20.6 km/sec on the sky relative to the star, or, 3.9 arcsec/hr.
The 1-sigma error in the time of the event is 59 seconds.
The 1-sigma cross-track error in the shadow position is 1002 km.

The object has an absolute magnitude Hv=7.3
Diameter=202.3 km assuming a 5% albedo -- 9.9 sec chord
Diameter=82.6 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 120181, (2024/11/04 01:57UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:20.9 +16:33:26  0.8  2.73 170
3Iot Aur       04:58:36.9 +33:12:11  2.7 14.80 172
PPM 120015     04:34:59.4 +18:04:02  6.3  1.24 171
PPM 120007     04:34:28.2 +19:23:56  8.3  0.44 173
PPM 120042     04:36:22.7 +18:57:18 11.2  0.32 172
120181         04:36:15.4 +19:16:27 16.7       173
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 120181, (2024/11/04 01:57UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  2.73 170
3Iot Aur       04:56:59.6 +33:09:58  2.7 14.80 172
PPM 120015     04:33:33.0 +18:01:00  6.3  1.24 171
PPM 120007     04:33:00.9 +19:20:53  8.3  0.44 173
PPM 120042     04:34:55.7 +18:54:19 11.2  0.32 172
120181         04:34:48.2 +19:13:28 16.7       173
Positions are for J2000

Event circumstances last updated at 2024/01/29 04:21:41 UT

Marc W. Buie, Southwest Research Institute

RECON