RECON: TNO occultation with 24978

Event between (24978) 98HJ151 and star UC4-331-089937 with event index number of 118457

Geocentric closest approach at 2018/06/02 15:16:10 UTC

J2000 position of star is 17:01:21.1 -23:50:16
Equinox of date position of star is 17:02:26.5 -23:51:46
Stellar brightness R=16.5, use SENSEUP=128
Star is 40 degrees from the moon. Moon is 86% illuminated.
TNO apparent brightness V=23.8

TNO is 42.8 AU from the Sun and 41.8 AU from the Earth.
The TNO is moving 24.6 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 1034 seconds.
The 1-sigma cross-track error in the shadow position is 4385 km.

The TNO has an absolute magnitude Hv=7.5
Diameter=190.6 km assuming a 5% albedo -- 7.7 sec chord
Diameter=77.8 km assuming a 30% albedo -- 3.2 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 24978, (2018/06/02 15:16UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.4 -26:28:17  0.9  7.68  47
23Tau Sco      16:37:01.9 -28:15:10  2.8  7.20  46
26 Oph         17:01:17.4 -25:00:56  5.8  1.18  40
PPM 266304     17:03:15.6 -23:18:49  8.4  0.58  40
PPM 266296     17:02:59.4 -23:53:59  9.1  0.12  40
24978          17:02:28.3 -23:51:48 16.5        40
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 24978, (2018/06/02 15:16UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  7.68  47
23Tau Sco      16:35:53.0 -28:12:58  2.8  7.20  46
26 Oph         17:00:09.6 -24:59:22  5.8  1.18  40
PPM 266304     17:02:08.7 -23:17:18  8.4  0.58  40
PPM 266296     17:01:52.2 -23:52:27  9.1  0.12  40
24978          17:01:21.1 -23:50:16 16.5        40
Positions are for J2000

Event circumstances last updated at 2017/12/04 18:41:49 UT

Marc W. Buie, Southwest Research Institute

RECON