RECON: TNO occultation with 5145

Event between (5145) Pholus and star GA0780:09761845 with event index number of 188072

Geocentric closest approach at 2019/04/22 20:41:58 UTC

J2000 position of star is 18:10:06.9 -10:46:34
Equinox of date position of star is 18:11:09.4 -10:46:16
Stellar brightness G=15.0, use SENSEUP=128
Star is 19 degrees from the moon. Moon is 86% illuminated.
TNO apparent brightness V=21.8

TNO is 28.2 AU from the Sun and 27.7 AU from the Earth.
The TNO is moving 11.5 km/sec on the sky relative to the star, or, 2.1 arcsec/hr.
The 1-sigma error in the time of the event is 255 seconds.
The 1-sigma cross-track error in the shadow position is 2380 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 20.0 sec chord
Diameter=93.5 km assuming a 30% albedo -- 8.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 5145, (2019/04/22 20:42UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:35.7 -26:28:24  0.9 28.44  10
35Eta Oph      17:11:29.2 -15:44:51  2.6 15.35   5
PPM 201392     18:07:10.5 -08:19:16  6.1  2.64  20
PPM 234074     18:09:21.7 -10:32:48  8.0  0.50  19
PPM 234110     18:10:46.1 -10:40:55  9.7  0.14  19
5145           18:11:11.2 -10:46:16 15.0        19
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, (2019/04/22 20:42UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 28.44  10
35Eta Oph      17:10:22.7 -15:43:29  2.6 15.35   5
PPM 201392     18:06:07.4 -08:19:27  6.1  2.64  20
PPM 234074     18:08:17.5 -10:33:03  8.0  0.50  19
PPM 234110     18:09:41.9 -10:41:13  9.7  0.14  19
5145           18:10:06.9 -10:46:34 15.0        19
Positions are for J2000

Event circumstances last updated at 2018/10/04 19:05:36 UT

Marc W. Buie, Southwest Research Institute

RECON