RECON: TNO occultation with 5145

Event between (5145) Pholus and star UC4-400-074721 with event index number of 119314

Geocentric closest approach at 2018/05/18 14:08:48 UTC

J2000 position of star is 18:01:30.9 -10:02:34
Equinox of date position of star is 18:02:26.9 -10:02:31
Stellar brightness R=15.3
Star is 166 degrees from the moon. Moon is 13% illuminated.
TNO apparent brightness V=21.6

TNO is 27.8 AU from the Sun and 27.0 AU from the Earth.
The TNO is moving 21.0 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 182 seconds.
The 1-sigma cross-track error in the shadow position is 1796 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 10.9 sec chord
Diameter=93.5 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 5145, (2018/05/18 14:09UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.2 -26:28:16  0.9 27.24 149
35Eta Oph      17:11:26.0 -15:44:47  2.6 13.69 158
64Nu Oph       18:00:02.3 -09:46:28  3.3  0.67 165
PPM 201352     18:04:55.0 -09:15:04  8.3  0.99 165
PPM 233904     18:01:56.1 -10:11:52  9.4  0.21 165
5145           18:02:31.7 -10:02:30 15.3       166
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, (2018/05/18 14:09UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:55  0.9 27.24 149
35Eta Oph      17:10:22.7 -15:43:29  2.6 13.69 158
64Nu Oph       17:59:01.6 -09:46:27  3.3  0.67 165
PPM 201352     18:03:54.5 -09:15:11  8.3  0.99 165
PPM 233904     18:00:55.2 -10:11:54  9.4  0.21 165
5145           18:01:30.9 -10:02:34 15.3       165
Positions are for J2000

Event circumstances last updated at 2016/12/01 19:06:17 UT

Marc W. Buie, Southwest Research Institute

RECON