RECON: TNO occultation with 5145

Event between (5145) Pholus and star GA0760:13558681 with event index number of 1314168

Geocentric closest approach at 2023/07/13 21:35:00 UTC

J2000 position of star is 18:26:30.8 -13:03:16
Equinox of date position of star is 18:27:49.6 -13:02:21
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 148 degrees from the moon. Moon is 14% illuminated.
Apparent brightness V=21.8

Object is 29.8 AU from the Sun and 28.8 AU from the Earth.
Apparent velocity is 25.1 km/sec on the sky relative to the star, or, 4.3 arcsec/hr.
The 1-sigma error in the time of the event is 103 seconds.
The 1-sigma cross-track error in the shadow position is 1355 km.

The object has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 9.3 sec chord
Diameter=93.5 km assuming a 30% albedo -- 3.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 5145, (2023/07/13 21:35UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:51.2 -26:28:56  0.9 30.52 177
Nunki          18:56:43.4 -26:15:55  2.0 14.86 145
PPM 234462     18:24:31.2 -12:00:05  6.3  1.32 148
PPM 234528     18:27:38.4 -13:20:44  8.1  0.31 148
PPM 234529     18:27:41.3 -12:58:31  8.9  0.07 148
5145           18:27:50.4 -13:02:21 16.9       148
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 5145, (2023/07/13 21:35UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 30.52 177
Nunki          18:55:15.9 -26:17:49  2.0 14.86 145
PPM 234462     18:23:12.2 -12:00:54  6.3  1.32 148
PPM 234528     18:26:18.6 -13:21:39  8.1  0.31 148
PPM 234529     18:26:21.7 -12:59:26  8.9  0.07 148
5145           18:26:30.8 -13:03:16 16.9       148
Positions are for J2000

Event circumstances last updated at 2023/04/19 02:41:14 UT

Marc W. Buie, Southwest Research Institute

RECON