RECON: TNO occultation with 05GF187

Event between 05GF187 and star GA0680:15999869 with event index number of 1191255

Geocentric closest approach at 2023/05/18 19:19:28 UTC

J2000 position of star is 17:40:35.9 -20:32:32
Equinox of date position of star is 17:41:59.1 -20:33:10
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 142 degrees from the moon. Moon is 1% illuminated.
Apparent brightness V=22.8

Object is 29.4 AU from the Sun and 28.5 AU from the Earth.
Apparent velocity is 19.7 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 524 seconds.
The 1-sigma cross-track error in the shadow position is 1447 km.

The object has an absolute magnitude Hv=8.1
Diameter=142.6 km assuming a 5% albedo -- 7.3 sec chord
Diameter=58.2 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 05GF187, (2023/05/18 19:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:50.7 -26:28:55  0.9 17.33 157
35Eta Oph      17:11:43.2 -15:45:08  2.6  8.64 148
58 Oph         17:44:49.9 -21:41:33  4.9  1.32 141
PPM 267170     17:43:55.6 -20:06:50  8.5  0.63 141
PPM 267138     17:42:15.0 -20:52:29  9.0  0.33 141
05GF187        17:41:59.4 -20:33:10 16.9       141
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 05GF187, (2023/05/18 19:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 17.33 157
35Eta Oph      17:10:22.7 -15:43:29  2.6  8.64 148
58 Oph         17:43:25.7 -21:41:00  4.9  1.32 141
PPM 267170     17:42:32.3 -20:06:15  8.5  0.63 141
PPM 267138     17:40:51.2 -20:51:52  9.0  0.33 141
05GF187        17:40:35.9 -20:32:32 16.9       142
Positions are for J2000

Event circumstances last updated at 2023/04/18 02:25:23 UT

Marc W. Buie, Southwest Research Institute

RECON