RECON: TNO occultation with 98HH151

Event between 98HH151 and star UC4-381-072429 with event index number of 188286

Geocentric closest approach at 2019/05/02 02:02:12 UTC

J2000 position of star is 15:55:15.2 -13:52:07
Equinox of date position of star is 15:56:13.6 -13:55:07
Stellar brightness R=16.3, use SENSEUP=128
Star is 129 degrees from the moon. Moon is 8% illuminated.
TNO apparent brightness V=23.5

TNO is 32.0 AU from the Sun and 31.0 AU from the Earth.
The TNO is moving 22.2 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 610 seconds.
The 1-sigma cross-track error in the shadow position is 5050 km.

The TNO has an absolute magnitude Hv=8.4
Diameter=128.8 km assuming a 5% albedo -- 5.8 sec chord
Diameter=52.6 km assuming a 30% albedo -- 2.4 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 98HH151, (2019/05/02 02:02UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:35.7 -26:28:24  0.9 14.89 118
8Bet1Sco       16:06:33.9 -19:51:25  2.6  6.42 125
PPM 230856     15:52:43.4 -14:11:26  6.2  0.92 129
PPM 230978     15:57:50.2 -13:37:50  7.8  0.47 128
PPM 230942     15:56:09.6 -13:55:43  8.9  0.04 129
98HH151        15:56:20.1 -13:55:27 16.3       128
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 98HH151, (2019/05/02 02:02UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 14.89 118
8Bet1Sco       16:05:26.2 -19:48:20  2.6  6.42 125
PPM 230856     15:51:38.4 -14:08:01  6.2  0.92 129
PPM 230978     15:56:45.4 -13:34:33  7.8  0.47 128
PPM 230942     15:55:04.6 -13:52:23  8.9  0.04 129
98HH151        15:55:15.2 -13:52:07 16.3       129
Positions are for J2000

Event circumstances last updated at 2017/05/21 16:38:25 UT

Marc W. Buie, Southwest Research Institute

RECON